Updated on 2023/02/08

写真a

 
TAKEDA Naoya
 
Organization
Academic Assembly Institute of Science and Technology SEISAN DESIGN KOUGAKU KEIRETU Professor
Graduate School of Science and Technology Advanced Materials Science and Technology Professor
Faculty of Engineering Department of Engineering Professor
Title
Professor
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Degree

  • 博士(理学) ( 1992.3   東北大学 )

Research Areas

  • Natural Science / Magnetism, superconductivity and strongly correlated systems

Research History (researchmap)

  • Niigata University   Faculty of Engineering Department of Engineering   Professor

    2017.4

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  • Niigata University   Graduate School of Science and Technology Advanced Materials Science and Technology   Professor

    2004.4

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  • Niigata University   Graduate School of Science and Technology Advanced Materials Science and Technology   Professor

    2004.4

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  • Niigata University   Faculty of Engineering Department of Material Science and Technology   Professor

    2004.3 - 2017.3

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Research History

  • Niigata University   Faculty of Engineering Department of Engineering   Professor

    2017.4

  • Niigata University   Graduate School of Science and Technology Advanced Materials Science and Technology   Professor

    2004.4

  • Niigata University   Graduate School of Science and Technology Advanced Materials Science and Technology   Professor

    2004.4

  • Niigata University   Faculty of Engineering Department of Material Science and Technology   Professor

    2004.3 - 2017.3

Committee Memberships

  • 日本学術振興会   特別研究員等審査会専門委員  

    2018.4   

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  • 日本学術振興会   国際事業委員会書面審査員・書面評価員  

    2018.4   

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    Committee type:Other

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  •   代議員  

    2017.9   

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  •   新潟支部支部長  

    2016.4 - 2018.3   

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  •   第54回高圧討論会実行委員  

    2013   

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  •   第66回年次大会実行委員  

    2010 - 2011   

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  •   代議員  

    2009.9 - 2011.8   

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  •   委員  

    2009.4 - 2011.3   

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  •   新潟支部委員・会誌編集  

    2006.9 - 2010.8   

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Papers

  • La-Substitution Effects on Multisite Ce Compound CePtGe<inf>2</inf>

    Hayato Muto, Shoma Onuma, Tomohito Nakano, Naoya Takeda, Jun Gouchi, Yoshiya Uwatoko, Klára Uhlířová, Jan Prokleška, Vladimír Sechovský

    Journal of the Physical Society of Japan   91 ( 7 )   2022.7

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    The CePtGe2 compound, which shows antiferromagnetic transition at Néel temperature TN = 3.8 K, has two crystallographically inequivalent Ce sites. Recently, the coexistence of a localized f-electron state at one of two Ce sites and an itinerant heavy f-electron state at the other Ce site has been suggested. In this study, we have prepared polycrystalline samples of (Ce1-xLax)PtGe2 (x = 0 ∼ 0.2) and have measured their electrical resistivity and magnetization. The specific heat for x = 0.2 has been measured also. With increasing x, the downward bending of the temperature dependence of the resistivity and the cusp-type anomaly in the susceptibility associated with TN shift to lower temperatures with a linear extrapolation of TN directing to 0 K at x ∼ 0.5. Also, the saturation magnetization decreases linearly with increasing x, pointing to the disappearance of magnetic moments at the same La concentration. These results indicate that only the Ce ions with the localized f-electron are substituted by La ions. On the other hand, the transition from the antiferromagnetic state to the ferromagnetic-like polarized magnetic state at a very weak magnetic field, which is comparable to that of conventional Ferrite magnets, was realized via the La-substitution.

    DOI: 10.7566/JPSJ.91.074712

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  • Superconductivity of the ternary stannide Y5Co6Sn18

    Naoki Kase, Taishi Anada, Yusuke Terui, Tomohito Nakano, Naoya Takeda

    PHYSICA B-CONDENSED MATTER   587   2020.6

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    Superconductivity is newly discovered in a single crystal of Y5Co6Sn18 at superconducting transition temperature T-c = 0.7 K. The single crystals are grown by a Sn flux method. Superconducting and normal properties of Y5Co6Sn18 are investigated by means of electrical resistivity rho(T) and specific heat C(T) measurements. Superconductivity is of bulk nature because of the jump at T-c from specific heat measurements. The Sommerfeld constant gamma and Debye temperature Theta(D) are estimated to be 9.6 mJ/(mol .K-2) and 450 K. The upper critical filed mu H-0(c2)(0) is estimated to be 0.825 T obtained from rho(T) in several magnetic fields.

    DOI: 10.1016/j.physb.2020.412149

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  • Coexistence of localized and heavy itinerant states in antiferromagnetic CePtGe2

    Tomohito Nakano, Shoma Onuma, Naoya Takeda, Klara Uhlirova, Jan Proklesky, Vladimir Sechovsky, Jun Gouchi, Yoshiya Uwatoko

    PHYSICAL REVIEW B   100 ( 3 )   2019.7

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    Two conflicting ground states, i.e., an antiferromagnetic ground state at 3.8K and aferromagnetic ground state at 5.1 K, have been reported for CePtGe2, which has two nonequivalent crystallographic Ce sites. In this study, we have prepared polycrystalline and single-crystalline CePtGe2 samples and measured their magnetization, specific heat, resistivity, and Seebeck coefficient. The observed bend in resistivity, peak in magnetic susceptibility, and lambda-type anomaly in specific heat at T-N = 3.8K and the metamagnetic transition in this CePtGe2 suggest antiferromagnetism at low temperatures. No evidence of ferromagnetic order was found in the studied temperature range, indicating possible crystal polymorphism with ferromagnetic character. The large susceptibility around TN and the Schottky-type specific heat indicate a well-localized f -electron state. However, the large residual gamma and X(0) indicate an itinerant heavy f -electron state. These findings suggest the coexistence of localized and heavy itinerant states corresponding to f electrons at the two Ce sites in this antiferromagnetic CePtGe2. The field dependence of magnetization indicates a sudden increase in magnetization at weak magnetic fields (similar to 0.2T), followed by a plateau at fields above 0.2 T, resulting in a possible different polarized metamagnetic state via interaction between localized and itinerant f electrons.

    DOI: 10.1103/PhysRevB.100.035107

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  • Physical properties of EuPdGe single crystal with monoclinic structure

    Kambe M., Nagai K., Saito T., Yamauchi N., Hatakeyama A., Minakawa A., Nomoto T., Kase N., Nakano T., Takeda N.

    Meeting Abstracts of the Physical Society of Japan   74.2   1928 - 1928   2019

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    Language:Japanese   Publisher:The Physical Society of Japan  

    DOI: 10.11316/jpsgaiyo.74.2.0_1928

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  • Physical properties of the Antiferromagnetic Compound CePtGe<sub>2</sub> under pressure II

    Gouchi J., Onuma S., Nakano T., Takeda N., Uwatoko Y.

    Meeting Abstracts of the Physical Society of Japan   74.1   1978 - 1978   2019

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    DOI: 10.11316/jpsgaiyo.74.1.0_1978

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  • Fundamental properties of a new samarium compound SmPtSi2 Reviewed

    Shuto Yamaguchi, Eisuke Takahashi, Naoki Kase, Tomohito Nakano, Naoya Takeda, Kazuyuki Matsubayashi, Yoshiya Uwatoko

    Physica B: Condensed Matter   536   297 - 299   2018.5

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    We have discovered a new orthorhombic ternary compound SmPtSi2. We succeeded in growing a single crystal of SmPtSi2
    prepared a polycrystalline sample of this compound, and measured their susceptibility, specific heat, and resistivity. The temperature dependence of susceptibility of the polycrystalline sample is close to that of Sm3+ at high temperatures, and its specific heat shows anomalies at TH = 8.6 K and TL = 5.6 K. The resistivity of a single crystal of SmPtSi2 shows a hump-type anomaly just below TH and a sudden decrease at TL, indicating that these anomalies are intrinsic and that SmPtSi2 exhibits a two-step transition.

    DOI: 10.1016/j.physb.2017.10.028

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  • Thermal expansion and magnetostriction of clathrate compound Pr3Pd20Ge6 Reviewed

    K.Matsumoto, Y.Sekiguchi, O.Iwakami, T.Ono, S.Abe, G.Ano, M.Akatsu, K.Mitsumoto, Y.Nemoto, T.Goto, N.Takeda, H.Kitazawa

    J.Phys.:Conf. Series   969   012120-1 - 012120-6   2018.4

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  • Superfluidity of 4He in dense aerogel studied using quartz tuning fork Reviewed

    K Matsumoto, Y Sekiguchi, O Iwakami, T Ono, S Abe, G Ano, M Akatsu, K Mitsumoto, Y Nemoto, T Goto, N Takeda, H Kitazawa

    J. Phys.: Conf. Ser.   969   12019   2018

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  • Single-crystal growth of α-Mn and its physical properties under pressure

    Tomaru A., Fukuhara K., Nakano T., Takeda N., Amakai Y., Murayama S.

    Meeting Abstracts of the Physical Society of Japan   73 ( 0 )   541 - 541   2018

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    DOI: 10.11316/jpsgaiyo.73.2.0_541

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  • Thermoelectric properties of 1T-Ta(S<sub>1-x</sub>Se<sub>x</sub>)

    Araki R., Matsumoto K., Nakano T., Takeda N.

    Meeting Abstracts of the Physical Society of Japan   73 ( 0 )   1568 - 1568   2018

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    DOI: 10.11316/jpsgaiyo.73.2.0_1568

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  • Physical properties of BaTSi (T = Pd, Pt) with non-centrosymmetric structure

    Kimura Y., Hosomichi M., Nakano T., Takeda N.

    Meeting Abstracts of the Physical Society of Japan   73 ( 0 )   1187 - 1187   2018

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    DOI: 10.11316/jpsgaiyo.73.2.0_1187

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  • Anisotropic superconductivity of Lu<sub>5</sub>T<sub>6</sub>Sn<sub>18</sub>(T = Co, Ir) with cage structure

    Watanabe K., Anada T., Nakano T., Takeda N.

    Meeting Abstracts of the Physical Society of Japan   73 ( 0 )   1188 - 1188   2018

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    DOI: 10.11316/jpsgaiyo.73.2.0_1188

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  • Measurement of the electrical resistivity of the Antiferromagnetic Compound CePtGe<sub>2</sub>

    Gouchi J., Onuma S., Nakano T., Takeda N., Uwatoko Y.

    Meeting Abstracts of the Physical Society of Japan   73 ( 0 )   1518 - 1518   2018

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    DOI: 10.11316/jpsgaiyo.73.2.0_1518

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  • Single crystal growth of transition metal oxide BaIrO<sub>3</sub> and its properties

    Domon Y., Kawai K., Nakano T., Takeda N.

    Meeting Abstracts of the Physical Society of Japan   73 ( 0 )   609 - 609   2018

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    Language:Japanese   Publisher:The Physical Society of Japan  

    DOI: 10.11316/jpsgaiyo.73.2.0_609

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  • Sample preparation of SmPtSi<sub>2</sub>and its fundamental properties

    Yamaguchi S., Takahashi E., Nakano T., Takeda N., Matsubayashi K., Uwatoko Y., Uhlirova K., Pronkleska J., Sechovsky V.

    Meeting Abstracts of the Physical Society of Japan   73 ( 0 )   1714 - 1714   2018

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    DOI: 10.11316/jpsgaiyo.73.2.0_1714

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  • Superconducting gap symmetry of the BiS2-based superconductor LaO0.5F0.5BiSSe elucidated through specific heat measurements Reviewed

    Naoki Kase, Yusuke Terui, Tomohito Nakano, Naoya Takeda

    PHYSICAL REVIEW B   96 ( 21 )   2017.12

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    In this study, the superconducting gap symmetry of LaO0.5F0.5BiSSe is elucidated through specific heat measurements with one single crystal of LaO0.5F0.5BiSSe. A clear jump is observed at 3.95 K in LaO0.5F0.5BiSSe, suggesting bulk superconductivity. From specific heat measurements, Delta C-e/gamma T-c and 2 Delta(0)/k(B)T(c) are obtained as 2.31 and 4.5. These values indicate strong electron-phonon coupling superconductivity. The temperature (T) and magnetic-field (H) dependence of the electronic specific heat C-e(T, H) suggests that superconductivity is fully gapped. Our handmade system successfully elucidates superconducting gap symmetry of the BiS2-based compound with a small single crystal.

    DOI: 10.1103/PhysRevB.96.214506

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  • Upper critical field of the single crystal La(O,F)BiSe2 Reviewed

    Y.Terui, N.Kase, T.Nakano, N.Takeda

    J.Phys.: Conf.Series   871   012005-1 - 012005-5   2017.7

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  • Superconducting gap of the single crystal beta-PdBi2 Reviewed

    H.Matsuzaki, K.Nagai, N.Kase, T.Nakano, N.Takeda

    J.Phys. : Conf.Series   871   012001-1 - 012001-5   2017.7

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  • Heavy-Fermion Compound of the ternary Phosphide Ce2Pt8P with a Non-Cencentrosymmetric Structure, Reviewed

    N.Kase, Shoh Furukawa, T.Nakano, N.Takeda

    J.Phys.Soc.Jpn.   86 ( 1 )   014704-1 - 014704-4   2017.1

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  • Sample preparation and basic fundamental propertie of CePtGe<sub>2</sub>

    Ohnuma S., Yamaguchi S., Kase N., Nakano T., Takeda N., Uwatoko Y.

    Meeting Abstracts of the Physical Society of Japan   72 ( 0 )   2150 - 2150   2017

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    DOI: 10.11316/jpsgaiyo.72.1.0_2150

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  • Superconductivity in Y6Tr4Al43 (Tr = Nb, Mo, Ta) with Peanut-Shaped Cage Structure Reviewed

    Naoki Kase, Ryoh Satoh, Tomohito Nakano, Naoya Takeda

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   85 ( 10 )   105001-1 - 105001-2   2016.10

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    Superconductivity is discovered in Y6Tr4Al43 (Tr = Nb, Mo, Ta) with a peanut-shaped cage structure at T-c = 0.86, 0.75, and 0.68 K, respectively. The superconducting state is revealed by performing electrical resistivity and specific heat measurements. The upper critical field is obtained to be 0.22 (Nb), 0.175 (Mo), and 0.15 T (Ta). A specific heat jump provides evidence of bulk superconductivity in these compounds.

    DOI: 10.7566/JPSJ.85.105001

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  • Thermal Conductivity Measurements of Caged Structural Superconductors Reviewed

    H. Matsuzaki, K. Hida, N. Kase, T. Nakano, N. Takeda

    PHYSICS PROCEDIA   ( 81 )   61 - 64   2016.5

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    DOI: 10.1016/j.phpro.2016.04.025

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  • Superconducting and Normal State Properties in the Ternary Silicide NbIrSi, TaIrSi, and NbPtSi Reviewed

    H. Suzuki, N. Kase, T. Nakano, N. Takeda

    PHYSICS PROCEDIA   ( 81 )   57 - 60   2016.5

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    DOI: 10.1016/j.phpro.2016.04.024

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  • Single crystal growth and superconducting properties of LaO0.5F0.5Bi(S0.8Se0.2)2 Reviewed

    Y. Terui, K. Saitoh, N. Kase, T. Nakano, N. Takeda

    PHYSICS PROCEDIA   ( 81 )   53 - 56   2016.5

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    DOI: 10.1016/j.phpro.2016.04.023

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  • Superconductivity in Ternary Pnictide SrPd2Sb2 Polymorphs Reviewed

    Naoki Kase, Harufumi Suzuki, Takenori Tsukamoto, Tomohito Nakano, Naoya Takeda

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   85 ( 4 )   043701-1 - 043701-5   2016.4

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    Superconductivity was observed in SrPd2Sb2 polymorphs: a primitive tetragonal CaBe2Ge2-type (low-temperature phase, LT-SrPd2Sb2) structure and body-centered ThCr2Si2-type (high-temperature phase, HT-SrPd2Sb2) structure. The superconducting transition was observed at T-c = 1.95 (LT) and 0.6K (HT). The specific heat C(T) showed a clear anomaly at T-c = 1.85 (LT) and 0.6K (HT); thus, the superconductivity was of a bulk nature. The agreement with the Bardeen-Cooper-Schrieffer (BCS) curve indicated that the LT-SrPd2Sb2 superconductor was fully gapped. The values of electron-phonon coupling lambda(ep) and density of state at Fermi level N(E-F) in 122 compounds with the CaBe2Ge2-type and its related structure were evaluated to reveal the main factor that determines T-c. From our systematic analysis, T-c of this family can be explained by lambda(ep) rather than N(E-F).

    DOI: 10.7566/JPSJ.85.043701

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  • Superconductivity in the ternary silicide TrIrSi (Tr = Ti, Zr, and Hf) Reviewed

    Naoki Kase, Harufumi Suzuki, Tomohito Nakano, Naoya Takeda

    SUPERCONDUCTOR SCIENCE & TECHNOLOGY   29 ( 3 )   035011   2016.3

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    We discover a new superconductor, TiIrSi at T-c = 1.4 K, and reveal a superconducting state of TrIrSi (Tr = Ti, Zr, and Hf) by using dc magnetic susceptibility chi(T), electrical resistivity rho(T), and specific heat C(T) measurements. Superconductivity of TrIrSi is confirmed in rho(T) at T-c = 1.4, 1.85, and 3.4 K, respectively. The electronic specific heat C-e(T) of TrIrSi can be fitted with the theoretical BCS curve of the weak-coupling limit with Delta C-e/gamma T-c = 1.43. Measurements in several magnetic fields suggest that TrIrSi is a type-II superconducting material with upper critical fields of mu H-0(c2)(0) = 0.751, 0.618, and 2.23 T, respectively. The electron-phonon coupling constants lambda(ep) are calculated to be 0.441, 0.464, and 0.545, which are consistent with the weak- coupling limit inferred from the specific jump. The T-c of TrIrSi depends on lambda(ep) and is inversely proportional to N(E-F).

    DOI: 10.1088/0953-2048/29/3/035011

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  • Low temperature superconducting phase of the ternary pnictide SrPd2Sb2 with CaBe2Ge2-type structure Reviewed

    N. Kase, H. Suzuki, T. Tsukamoto, T. Nakano, N. Takeda

    JOURNAL OF PHYSICS-CONFENCE SERIES   ( 683 )   012034   2016.2

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  • Low-temperature study of the Sm-based compound SmOs2Zn20 Reviewed

    M. Tanahashi, K. Adachi, T. Sasahara, N. Kase, T. Nakano, N. Takeda

    JOURNAL OF PHYSICS-CONFENCE SERIES   ( 683 )   012019   2016.2

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  • Low temperature properties of ZrTr2Zn20 (Tr = transition metal) with a pyrochlore lattice Reviewed

    S. Hasegawa, K. Morihiro, N. Kase, T. Nakano, N. Takeda

    JOURNAL OF PHYSICS-CONFENCE SERIES   ( 683 )   012021   2016.2

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  • NMR studies on polyphosphide Ce6Ni6P17 Reviewed

    T. Koyama, H. Yamada, K. Ueda, T. Mito, Y. Aoyama, T. Nakano, N. Takeda

    Journal of Physics: Conference Series   683 ( 1 )   12027   2016

  • Antiferromagnetic transition of the caged compound TmTi2Al20 Reviewed

    Naoki Kase, Yasuyuki Shimura, Shunichiro Kittaka, Toshiro Sakakibara, Satoru Nakatsuji, Tomohito Nakano, Naoya Takeda, Jun Akimitsu

    INTERNATIONAL CONFERENCE ON STRONGLY CORRELATED ELECTRON SYSTEMS 2014 (SCES2014)   592   012052-1 - 012052-5   2015

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    We examined the low temperature magnetic properties of a single crystal of TmTi2Al20, a hole analogue of PrTi2Al20, by means of specific heat C(T) and magnetization M(T, H) measurements. At low field, an anomaly that can be ascribed to an antiferromagnetic ordering is observed in M(T) at T-N = 0.7 K. C(T) shows a very sharp lambda-type anomaly at 0.7 K, confirming the phase transition. From the calculated magnetic entropy S(T), we found that the ground state of TmTi2Al20 is likely to be a magnetic Gamma(5) triplet in the J = 6 multiplet.

    DOI: 10.1088/1742-6596/592/1/012052

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  • Magnetic ordering of hyperfine-coupled nuclear and 4f -electron moments in the clathrate compound Pr3Pd20Ge6. Reviewed

    O. Iwakami, Y. Namisashi, S. Abe, K. Matsumoto, G. Ano, M. Akatsu, K. Mitsumoto, Y. Nemoto, N. Takeda, T. Goto, H. Kitazawa

    PHYSICAL REVIEW B   90 ( 10 )   100402-1 - 100402-5   2014.9

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    Complex ac susceptibility, chi = chi' - i chi '', measurements of the clathrate compound Pr3Pd20Ge6 were performed in static fields up to 10 mT for H parallel to [001] and at temperatures down to 500 mu K. Praseodymium (Pr) nuclear magnetic moments at the 8c site, where quadrupole moments of 4f electrons order at T-Q1 = 250 mK, were found to order antiferromagnetically at 9 mK, as shown by a peak in chi' and a substantial increase in thermal relaxation time. The large enhancement factor (1 + K-8c) obtained by calculation of the hyperfine-enhanced nuclear susceptibility of Pr at the 8c site accounts for the high transition temperature of Pr nuclear magnetic moments and the large chi' below 30 mK. From analysis of the crystalline electric field and the mean-field approximation, we conclude that a chi peak at 77 mK can be ascribed to an antiferromagnetic ordering of magnetic moments of 4f electrons at the 4a site. We found that nuclear and f-electron moments order separately on two sublattices in this compound. The temperature and magnetic field dependence of chi' and chi '' between 30 and 60 mK are discussed in terms of dissipation phenomena.

    DOI: 10.1103/PhysRevB.90.100402

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  • Another phase transition beside superconductivity in skutterudite LaOs4P12

    N.Takeda, N.Hoshi, S. Yodono, R.Takeda, N.Kurotaki, T.Nakano

    JPS Conf.Proc.   3   017024-1 - 017024-5   2014.7

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  • Vibrational dynamics of filled skutterudites LaT4X 12(T = Fe, Ru, Os, X = As, Sb) Reviewed

    Michael Marek Koza, Devashibhai Adroja, Naoya Takeda, Zygmunt Henkie, Tomasz Cichorek

    Journal of the Physical Society of Japan   82 ( 11 )   114607/1 - 11   2013.11

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    We report on the vibrational properties of the lanthanum filled skutterudite compounds LaRu4Sb12, LaOs4Sb 12, and LaOs4As12studied by inelastic neutron scattering. The experimental data are backed up by ab initio lattice dynamics calculations of the complete series of lanthanum filled skutterudites LaT 4X12with T = Fe, Ru, Os and X = As, Sb. We present details of their structural properties, phonon dispersion relations, vibrational densities of states Z(w) and specific heats CV(T) calculated from Z(w) within the harmonic approximation. Powder averaged lattice dynamics (PALD) technique is applied to approximate the experimental signal presented as the generalized density of states G(w) with high accuracy. Furthermore, the PALD approach is exploited to compute average transverse vtPALD and longitudinal v1PALD sound velocities, elastic constants c11 PALD, c44 PALD, bulk moduli B PALD, and Debye temperatures θD ALD. The PALD results are compared with data computed from ab initio lattice dynamics calculations. All calculated properties are in very good agreement with literature data. © 2013 The Physical Society of Japan.

    DOI: 10.7566/JPSJ.82.114607

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  • Intermediate valence behavior of Yb2Ni12P7 studied by using 31P NMR Reviewed

    T. Koyama, K. Sugiura, K. Ueda, T. Mito, T. Kohara, R. Satoh, K. Tsuchiya, T. Nakano, N. Takeda

    Journal of the Korean Physical Society   63 ( 3 )   416 - 419   2013.8

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    The Yb-based heavy-fermion compound Yb2Ni12P7 with a hexagonal Zr2Fe12P7-type crystal structure was investigated by using the 31P nuclear magnetic resonance (NMR) technique. The complicated NMR line changes its shape gradually with decreasing temperature, implying the presence of some Knight shift components. The temperature dependences of the Knight shift and the nuclear spin-lattice relaxation rate 1/T 1 suggest the delocalization of 4f electrons. © 2013 The Korean Physical Society.

    DOI: 10.3938/jkps.63.416

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  • Low-temperature magnetic properties of RE2Ni21B 6 (RE = Er, Tm, Yb and Lu) Reviewed

    J. Kitagawa, N. Takeda, M. Ishikawa

    Journal of Alloys and Compounds   561   101 - 104   2013.6

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    The low-temperature magnetic properties of RE2Ni 21B6 (RE = Er, Tm, Yb and Lu) crystallizing into a cubic C6Cr23-type structure were investigated by measuring magnetic susceptibility, electrical resistivity and specific heat. An off-stoichiometric Er compound with a single phase undergoes antiferromagnetic ordering at 0.61 K. Tm and Yb compounds have no magnetic ordering down to 50 mK. The 4f-electron ground state under a cubic crystalline electric field was deduced by the analysis of the specific heat for each magnetic compound. Tm 2Ni21B6 is considered to have the non-Kramers T3-doublet ground state with a quadrupolar moment. The quadrupolar moment does not show a long-range order, but probably enters into a glass state owing to the presence of atomic disorder. Our study suggests that atomic disorder degrades the long-range nature of quadrupolar interactions. © 2013 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.jallcom.2013.01.073

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  • Magnetic phase diagram of clathrate compound Ce3Pd20Si6 with quadrupolar ordering Reviewed

    H. Ono, T. Nakano, N. Takeda, G. Ano, M. Akatsu, Y. Nemoto, T. Goto, A. Doenni, H. Kitazawa

    JOURNAL OF PHYSICS-CONDENSED MATTER   25 ( 12 )   126003-1 - 4   2013.3

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    We present results of specific heat measurements on a Ce3Pd20Si6 single crystal and construct the magnetic phase diagram for the three cubic principal directions [100], [110] and [111]. The highly anisotropic phase diagram is discussed and can be qualitatively explained by the Zeeman splitting at the 8c-site. For B parallel to [100], the present study found two different quadrupolar ordered phases, which meet the paramagnetic phase at a tri-critical point and establish the new phase boundaries.

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  • Magnetic Properties of Cubic compound Ce6Ni6P17 with geometric Frustration Reviewed

    N.Takeda, K.Izumi, H.Ono, S.Yodono, T.Nakano

    J.Phys.:Conf.Series   3991   012071-1 - 012071-2   2012.12

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  • Magnetization, Resistivity and Specific Heat of Hexagonal R2Ni12P7 with Filled-Cr12P7 Structure Reviewed

    Tomohito Nakano, Katsuhiko Tsuchiya, Atsumi Ohashi, Takashi Nashimoto, Hiroki Ono, Naoya Takeda, Naoki Shirakawa

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   81 ( 7 )   074604-1 - 074604-8   2012.7

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    We prepared single-crystal samples of hexagonal R2Ni12P7 (R = Sm, Gd-Lu) using a Sn-flux method, and measured their magnetization, resistivity, and specific heat. The antiferromagnetic order in Gd2Ni12P7 and Ho2Ni12P7, the ferromagnetic order in Dy2Ni12P7 and Er2Ni12P7, and the ferromagnetic-like order in Sm2Ni12P7, Tb2Ni12P7, and Tm2Ni12P7 were evidenced by the results of the measurements. In contrast, we found that Yb2Ni12P7 is in a heavy fermion state at low-temperature region. Hump-type anomalies in specific heat were observed below the magnetic transition temperature in R2Ni12P7 (R = Gd, Tb, and Dy), indicating the Zeeman splitting of the J-multiplet of the R3+ ion in the ordered state.

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  • Quadrupole Ordering and Rattling Motions in Clathrate Compound Pr3Pd20Ge6 Reviewed

    G.Ano, T.Yamaguchi, K.Araki, K.Matsuo, Y.Tachikawa, K.Mitsumoto, M.Akatsu, Y.Nemoto, T.Goto, N.Takeda, A.Donni, H.Kitazawa

    J.Phys.Soc.Jpn.   81   034710-1 - 034710-11   2012.3

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    DOI: 10.1143/JPSJ.81.034710

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  • Pressure effect of transport properties of hexagonal Yb2Ni12P7 Reviewed

    Tomohito Nakano, Ryohei Satoh, Katsuhiko Tsuchiya, Naoya Takeda, Kazuyuki Matsubayashi, Yoshiya Uwatoko

    INTERNATIONAL CONFERENCE ON STRONGLY CORRELATED ELECTRON SYSTEMS (SCES 2011)   391   012054-1 - 012054-2   2012

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    We prepared single crystals of Yb2Ni12P7 using a Sn-flux method and measured their resistivity under hydrostatic pressure up to 8 GPa. At ambient pressure, the magnetic part of resistivity rho(mag)(T) shows a peak around T-max similar to 100 K and T-2 dependence below the characteristic temperature of the Fermi liquid, T-FL = 3 K. When pressure increases up to 2.06 GPa, the value of rho(mag)(T) above T-max decreases slightly but rho(mag) below T-max increases slightly. TFL decreases with increasing pressure, and is expected to become zero at 2.5 GPa. Around this pressure, the coefficient of T-2 in rho(mag) significantly increases, suggesting the existence of a quantum critical point. Above 2.5 GPa, overall rho(mag) gradually decreases with increasing pressure up to 6 GPa, but it below 15.5 K increases above 6 GPa.

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  • Specific heat of Ce3Pd20Si6 single crystal in magnetic fields Reviewed

    H. Ono, T. Nakano, N. Takeda, G. Ano, M. Akatsu, Y. Nemoto, T. Goto, H. Kitazawa

    INTERNATIONAL CONFERENCE ON STRONGLY CORRELATED ELECTRON SYSTEMS (SCES 2011)   391   012054-1 - 012054-4   2012

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    We report the specific heat measurement of single crystalline Ce3Pd20Si6 and the resultant magnetic phase diagram for the direction of B//[100]. In zero field, we confirmed two successive phase transitions at T = 0.24 K and 0.4 K. The magnetic phase diagram clearly shows a phase boundary of paramagnetic phase I, quadrupole ordered phase II and II'.

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  • Physical properties of unfilled skutterudite NiP3 Reviewed

    N. Takeda, T. Nakajo, H. Ono, K. Tatematsu, T. Nakano

    Journal of the Physical Society of Japan   80   SA035-1 - SA035-2   2011.7

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    We succeeded to prepare large single crystals. We present the electrical resistivity, the magnetic susceptibility and the low-temperature specific heat measurements of unfilled skutterudite NiP3. The temperature dependence of the electrical resistivity of NiP3 is metallic and the residual resistivity ratio, RRR, is estimated to be about 30. No superconductivity was found down to 0.078 K. The magnetic susceptibility shows weakly temperature dependent Pauli paramagnetism. The electronic specific-heat coefficient was determined to be 8.0 mJ/mole·K2. © 2011 The Physical Society of Japan.

    DOI: 10.1143/JPSJS.80SA.SA035

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  • The magnetic moment without magnetic phase transition in insulating RR'S3(R=La, Ce, Pr, Nd; R'=Yb, Lu) Reviewed

    Hiroki Ono, Tatsuya Kuwahara, Tatsuya Furui, Kenji Tatematsu, Tomohito Nakano, Naoya Takeda

    Journal of the Physical Society of Japan   80   SA079-1 - SA079-   2011.7

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    We have synthesized RR'S3(R=La, Ce, Pr, Nd
    R'=Yb, Lu) by a flux method, with a flux of potassium iodide, KI, and have measured the magnetic susceptibility and specific heat. The magnetic susceptibility of LaYbS3, CeYbS3, CeLuS3, PrLuS3 and NdLuS3 follows a Curie-Weiss law at high temperatures. From the slope of χ-1 versus T, we evaluate the valence of all rare-earth elements to be trivalent. LaYbS3, CeYbS3, CeLuS3, and PrLuS3 show no clear magnetic transition, while NdLuS3 shows one at 0.25 K. © 2011 The Physical Society of Japan.

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  • Low-temperature magnetic properties of Ho2Ni12P7 Reviewed

    Katsuhiko Tsuchiya, Atsumi Ohashi, Takahumi Nashimoto, Hiroki Ono, Kenji Tatematsu, Tomohito Nakano, Naoya Takeda

    Journal of the Physical Society of Japan   80   SA081-1 - SA081-2   2011.7

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    We present the magnetic susceptibility and low-temperature specific-heat of Ho2Ni12P7. The magnetic susceptibility of Ho2Ni12P7 follows a Curie-Weiss law down to 10 K. Ho2Ni12P7 orders antiferromagnetically below Néel temperature TN = 10 K. The magnetization exhibits a metamagnetic behavior below TN. The specific-heat shows a clear peak due to the transition. The crystalline-field ground state of Ho2Ni12P7 is a doublet. © 2011 The Physical Society of Japan.

    DOI: 10.1143/JPSJS.80SA.SA081

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  • Electric field gradient fluctuations in filled skutterudite ReRu 4Sb12 (Re = La, Ce and Pr) probed by Sb-NQR Reviewed

    Mamoru Yogi, Haruo Niki, Hitoshi Sugawara, Naoya Takeda, Hideyuki Sato

    Journal of the Physical Society of Japan   80   SA027-1 - SA027-3   2011.7

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    We have carried out 121,123Sb nuclear quadrupole resonance (NQR) measurements on ReRu4Sb12 (Re = La, Ce and Pr) to investigate an anomalous behavior of the nuclear spin-echo relaxation rate 1/T2 observed in ReOs4Sb12. The full width at half maximum of the NQR spectrum shows a step-like increase below 130 K with decreasing temperature. Temperature dependence of 1/T2 also shows a divergence at ∼115 K whereas the nuclear spin-lattice relaxation rate 1/T1 does not show any anomaly. These results are caused by a distribution of the electric field gradient (EFG) and its fluctuations, which might arise from a rattling motion of the rare earth ion centered in the cage which consists of twelve Sb and/or a small deformation of the cage. The EFG fluctuations observed in ReOs4Sb12 and ReRu 4Sb12 at T ∼ 120 K originates from an unique crystal structure of the filled skutterudite with oversized Sb-cage. © 2011 The Physical Society of Japan.

    DOI: 10.1143/JPSJS.80SA.SA027

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  • Seebeck coefficient for concentrated Kondo compound CePtSi2 under hydrostatic pressure Reviewed

    T.Nakano, S.Yonamine, M.Hedo, T.Nakama, M.Ohashi, N.Takeda, G.Oomi

    J.Phys.Soc.Jpn.   80   SA028-1 - SA028-2   2011.6

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    DOI: 10.1143/JPSJS.80SA.SA058

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  • Quadrupole Ordering and Rattling in Clathrate Compound Pr3Pd20Ge6 Reviewed

    G. Anol, K. Matsuo, K. Araki, Y. Tachikawa, K. Mitsumoto, M. Akatsu, Y. Nemoto, T. Goto, N. Takeda, A. Kikkawa, A. Doenni, H. Kitazawa

    INTERNATIONAL CONFERENCE ON STRONGLY CORRELATED ELECTRON SYSTEMS (SCES 2010)   273   012002-1 - 012002-2   2011

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    We have studied quadrupole ordering and rattling in clathrate compound Pr3Pd20Ge6 using ultrasonic measurements. The softening were observed in temperature dependence of elastic constants C-11, (C-11 - C-12)/2 and C-44. The C-11 and (C-11 - C-12)/2 show minimums at 250 mK indicating a transition point to an antiferroquadrupole ordered phase due to a F3 doublet ground state at 8c site. Furthermore, the C-11, (C-11 - C-12)/2 and C-44 exhibit discontinuitive anomalies at 60 mK revealing a ferroquadrupole ordering due to a F-5 triplet ground state at 4a site. Two distinctive ultrasonic dispersions caused by thermally activated F-5-type rattling were observed in C-44 around 15 K and 25 K.

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  • Quadrupole Order in Clathrate Compound Pr3Pd20Si6 Reviewed

    M. Akatsu, S. Tsuduku, Y. Nemoto, T. Goto, I. Ishii, K. Mitsumoto, G. Ano, H. Kobayashi, N. Takeda, A. Doenni, H. Kitazawa

    INTERNATIONAL CONFERENCE ON MAGNETISM (ICM 2009)   200   012121-1 - 012121-4   2010

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    In order to investigate ordered phases revealed at low temperatures in clathrate compound Pr3Pd20Si6, we have performed ultrasonic measurements using a single crystal in magnetic fields at low temperatures. Temperature dependence of elastic constant C-11 and C-L[1 (1) over bar0] = (C-11 + C-12 + C-2(44))/2 shows the anomalies at about 150 mK in zero field. Magnetic phase diagrams are determined by measuring C-11 in H parallel to [001] and C-L[1 (1) over bar0] in H parallel to [111]. The magnetic phase diagrams along the three principal axes indicate a closed loop and a strong magnetic anisotropy. This result suggests that antiferroquadrupole ordering appears at low temperatures in Pr3Pd20Si6.

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  • Ultrasonic investigation of off-center rattling in Pr0.55Nd0.45Os4Sb12 Reviewed

    Tatsuya Yanagisawa, Taichi Mayama, Hiroyuki Hidaka, Hiroshi Amitsuka, Akio Yamaguchi, Koji Araki, Yuichi Nemoto, Terutaka Goto, Naoya Takeda, Pei-Chun Ho, M. Brian Maple

    PHYSICA B-CONDENSED MATTER   404 ( 19 )   3235 - 3237   2009.10

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    Ultrasonic measurements on a Pr0.55Nd0.45Os4Sb12 single crystal for temperature down to 20mK and frequencies up to 245 MHz were performed in order to investigate off-center rattling motion of rare-earth ions. The elastic constant C-11 exhibits double ultrasonic dispersions at similar to 15 and similar to 40 K, which are similar to the features found in NdOs4Sb12. The estimated activation energy E-1 = 240 K corresponding to the 40 K-dispersion, possesses an intermediate value between PrOs4Sb12 (E-1 = 115 K) and NdOs4Sb12 (E-1 = 337 K). (C) 2009 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.physb.2009.07.081

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  • Quadrupole Ordering in Clathrate Compound Ce3Pd20Si6 Reviewed

    Terutaka Goto, Tomyuki Watanabe, Seiji Tsuduku, Haruki Kobayashi, Yuichi Nemoto, Tatsuya Yanagisawa, Mitsuhiro Akatsu, Genki Ano, Osamu Suzuki, Naoya Takeda, Andreas Donni, Hideaki Kitazawa

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   78 ( 2 )   024716-1 - 024716-9   2009.2

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    Low-temperature elastic properties of the clathrate compound Ce3Pd20Si6 were investigated using ultrasonic measurements. Pronounced softening of elastic constants (C-11 - C-12)/2 and C-44 with decreasing temperature indicates a precursor of electric quadrupole ordering due to it Gamma(8) quartet ground sate with an orbital degeneracy for 8c site of it Ce ion. A minimum of (C-11 - C-12)/2 at T-C = 170 mK indicates a transition from paramagnetic phase I to an ordered phase III. Applied magnetic fields induce an antiferro-quadrupole (AFQ) ordered phase II with highly anisotropic character depending on the field direction, which resembles the AFQ phase with O-xy-type order parameter in CeB6 with the Gamma(8) ground sate. The order parameter of the phase III may be characterized by either magnetic dipole or magnetic octupole. The Gamma(7) ground state at 4a site may fall into it singlet screened by conduction electrons at low temperatures Without long-range magnetic ordering.

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  • Low temperature x-ray diffraction study on superconductivity Reviewed

    Y. Xue, H. Kaneko, Q. Tao, Z. Xu, N. Takeda, Y. Nemoto, T. Goto, H. Suzuki

    25TH INTERNATIONAL CONFERENCE ON LOW TEMPERATURE PHYSICS (LT25), PT 5A   150 ( 5a )   052284-1 - 052284-4   2009

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    Using a low temperature x-ray diffractometer, we studied superconductivity materials, optimally doped and underdoped YBCOs and PrOs(4)Sb(12) between 0.1 K and 300 K. At several temperatures, whole profiles of the x-ray reflection peak were measured and refined by Rietveld analysis. By Rietveld analysis, we found that Pr atoms in PrOs(4)Sb(12) are still oscillating at an amplitude of about 0.1 angstrom at 0.18 K. For some reflection planes, x-ray diffraction measurement with a small step size and a long stepping time was performed to accumulate more counts at certain temperatures. The lattice constant d of optimally doped YBCO (OPT YBCO) shows anomalous behaviours at around the superconductivity transition temperature Tc and around spin gap temperature T*. In OPT YBCO, the intensity of the reflection spectrum shows a clear anomaly at around Tc.

    DOI: 10.1088/1742-6596/150/5/052284

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  • Inelastic neutron scattering study of spin gap formation in heavy fermion compounds Reviewed

    D. T. Adroja, K. A. Mcewen, J. -G. Park, A. D. Hillier, N. Takeda, P. S. Riseborough, T. Takabatake

    JOURNAL OF OPTOELECTRONICS AND ADVANCED MATERIALS   10 ( 7 )   1564 - 1582   2008.7

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    According to conventional theories of strongly correlated electron systems, the natural consequence of strong hybridization between f-electrons and conduction electrons is the opening of a gap in both charge and spin channels. Despite their importance, there are few experimental observations of such gaps in real materials. Recently the charge gap in d- and f-electron systems has been investigated using optical studies. However, due to the q=0 limitation of the technique, optical studies cannot give information on the wave vector dependence of the gap. Inelastic neutron scattering is a unique technique and provides direct information on the spin gap energy as well as its wave vector and temperature dependence. Further, knowledge of the wave vector dependence of the gap, in particular the spin gap, provides important information about the microscopic mechanism of the gap formation. Recently we have investigated the spin gap formation, and its relation to the charge gap, in several Ce, Yb and U based compounds using inelastic neutron scattering techniques. We review here the nature of the spin gap in CeT4Sb12 (T = Ru, Os and Fe), CeRhAs and U2-xThxRu2Sn compounds based on our recent neutron scattering studies. We compare the magnitude of the spin gaps we have measured in this way with that of the charge gaps measured in optical studies. We have found a universal scaling relation between the spin gap energy and the Kondo temperature (T-K) for many strongly correlated electron systems and the results are discussed.

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  • NQR Study of Filled Skutterudite CeT4Sb12(T=Ru and Os) Reviewed

    M.Yogi 他

    J.Phys.Soc.Jpn.,Supple.A   77   321 - 323   2008.6

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  • Heavy Fermion Behaviors of Tm2Rh12P7 Reviewed

    K.Tatematsu, N.Takeda 他

    J.Phys.Soc.Jpn.,Supple.A   77   353 - 355   2008.6

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  • Guest Ion Motion in Cage Structure Crystals Investigated by Raman Scattering Reviewed

    M.Udagawa, T.Hasegawa, Y.Takasu, N.Ogita, K.Suekuni, M.A.Avila, T.Takabatake, Y.Ishikawa, N.Takeda

    J.Phys.Soc.Supple.A   77   142 - 147   2008.4

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  • Ru-NQR studies on filled skutterudite compounds RRu4P12 (R = La, Nd, Sm) Reviewed

    S. Masakia, T. Mito, M. Takemura, S. Wada, H. Harima, D. Kikuchi, H. Sato, H. Sugawara, N. Takeda, G. -q. Zheng

    PHYSICA B-CONDENSED MATTER   403 ( 5-9 )   1630 - 1632   2008.4

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    We report nuclear quadrupole resonance (NQR) studies on Ru-sites of filled skutterudite compounds RRuR12 (R = La, Nd, Sm) in zero magnetic field. For NdRu4P12, the Ru-101-NQR signal disappears below T-C = 1.6 K, which is indicative of the transformation into the ferromagnetically ordered ground state. For SmRu4P12, a single Ru-101-NQR line splits into two lines below the metal-insulator transition temperature T-MI = 16.5 K with the intensity ratio of 3 : 1. This result gives evidence that there are two inequivalent Ru-sites with different electric field gradient. The intensity ratio leads to a conclusion that the symmetry is lowered below T-MI from a cubic Im (3) over bar space group to a trigonal M one. (C) 2007 Elsevier B.V. All rights reserved.

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  • NQR investigation on multipolar ordering systems Reviewed

    T. Mito, S. Tomisawa, S. Masaki, M. Takemura, S. Wada, H. Harima, Y. Kato, M. Kosaka, D. Kikuchi, H. Sato, H. Sugawara, N. Takeda, G. -q. Zheng

    PHYSICA B-CONDENSED MATTER   403 ( 5-9 )   1633 - 1635   2008.4

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    We have carried out nuclear quadrupolar resonance (NQR) measurements on SmRu4P12 and YbAl3C3, both of which have attracted much interest in terms of multipolar ordering. Although no structural anomalies have been detected by diffraction experiments so far, the NQR resonance frequencies v(Q)'s of both compounds show marked anomalies just below each phase transition temperature, which probably probes the order parameters. The results provide important information to shed light on the ordered structures in the low temperature phases of these compounds. (C) 2007 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.physb.2007.10.206

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  • 31P-NMR study in single crystal SmRu4P12 Reviewed

    S.Masaki 他

    J.Phys.Soc.Jpn.;SuppleA.   77   206 - 208   2008.1

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  • Rattling in Clathrate Compounds of ROs4Sb12 and R3Pd20Ge6 Reviewed

    Y.Nemoto, T.Yanagisawa 他

    J.Phys.Soc.Jpn.Supple.A   77   153 - 158   2008.1

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  • Elastic Quadrupole Effect in Clathrate Compound Pr3Pd20Si6 Reviewed

    T.Yanagisawa 他

    J.Phys.Soc.Jpn.,SuppleA   77   263 - 265   2008.1

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  • Raman Scattering Study of Filled Skutterudite Compounds Reviewed

    N.Ogita 他

    J.Phys.Soc.Jpn.;Supple.A   77   251 - 253   2008.1

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  • Metamagnetism of ferromagnetic Kondo compound SmFe4P 12 Reviewed

    Naoya Takeda, Hiroyuki Mitamura, Koichi Kindo

    Journal of the Physical Society of Japan   77   209 - 210   2008

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    SmFe4P12 is a novel ferromagnetic heavy fermion compound with a Curie temperature Tc of 1.6K. The electronic specific heat coefficient is 370 mJ/mol·K2. The magnetic susceptibility of La1-xSmxFe4P12 (0.6 ≤ x ≤ 0.85) with a paramagnetic ground state shows a broad maximum around 15K. This phenomenon reminds us the case of CeRu2Si 2 which is in the boundary of itinerant and localized 4f-state. We measured the magnetization up to 42T and found metamagnetic crossover at 22T. The metamagnetism disappears with increasing temperature. Possible mechanism of the metamagnetism is discussed. ©2008 The Physical Society of Japan.

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  • Ultrasonic Study of Rattling and Tunneling in Clathrate Compounds R3Pd20X6 (R=La, Ce; X=Si, Ge). Reviewed

    T.Watanabe, T.Yamaguchi, Y.Nemoto, T.Goto, N.Takeda, O.Suzuku, H.Kitazawa

    Journal of Magnetism and Magnetic Materials   310   948 - 950   2007.12

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  • Antiferroquadrupolar ordering and anisotropic magnetic phase diagram of dysprosium palladium bronze, DyPd3S4 Reviewed

    Eiichi Matsuoka, Takashi Tayama, Toshiro Sakakibara, Zenji Hiroi, Naoki Shirakawa, Naoya Takeda, Masayasu Ishikawa

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   76 ( 8 )   0084717(7)   2007.8

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    From the measurements of magnetization and specific heat, we constructed B-T phase diagrams of single-crystalline DyPd3S4 which is known to exhibit antiferroquadrupolar (AFQ) and antiferromagnetic (AFM) ordering at low temperatures. The phase diagrams are found to be highly anisotropic and reentrant, which are typical of rare-earth compounds exhibiting multipolar ordering. The crystalline electric field (CEF) scheme of Dy3+ in DyPd3S4 was deduced from the specific heat and magnetization measurements of the Y-diluted compounds Dy1-xYxPd3S4 (0.1 &lt;= x &lt;= 0.9) and discussed in detail. The CEF ground state was determined to be the orbitally-degenerated quartet 17670), and the overall splitting width was estimated to be about 104 K. No correlation was found between the anisotropy of To and that of the Zeeman splitting width of the ground quartet Gamma((1))(67).

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  • Investigation of SmFe4P12 at pressures to 8 GPa Reviewed

    K.Kurita, M.Hedo, Y.Uwatoko, N.Takeda, S.W.Tozer

    J.Phys.Soc.Jpn.,Supple.A   76   64 - 65   2007.6

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  • Observation of symmetry lowering associated with the metal-insulator transition in SmRu4P12 by Ru-101-NQR Reviewed

    Satoru Masaki, Takeshi Mito, Masayuki Takemura, Shinji Wada, Hisatomo Harima, Daisuke Kikuchi, Hideyuki Sato, Hitoshi Sugawara, Naoya Takeda, Guo-qing Zheng

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   76 ( 4 )   043714-1 - 043714-4   2007.4

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    We report the results of NQR (nuclear quadrupole resonance) study on SmRu4P12, one of a few candidates for materials showing octupolar ordering. In this study, we firstly succeeded in observing the Ru-101-NQR signal in filled skutterudite compounds RRu4P12 (R: rare earth). A single Ru-101-NQR signal splits into two resonance lines, having intensity ratio of 3 : 1, just below the metal-insulator (M-I) transition temperature of 16.5 K. This result gives convincing evidence for symmetry lowering in the ordered state of this compound, namely the cubic Im(3) over bar space group for the filled skutterudite compounds is lowered to the trigonal R(3) over bar. The model of the ordered structure characterized by a wave vector q = (1, 0, 0) satisfactorily explains the observed phenomena in the present study and the M-I transition in this compound.

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  • NMR study of the successive two phase transitions in SmRu4P12 Reviewed

    Masaki Satoru, Mito Takeshi, Shinji Wada, Naoya Takeda, Daisuke Kikuchi, Hideyuki Sato, Hitoshi Sugawara, Guo-qing Zheng

    JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS   310 ( 2 )   E175 - E177   2007.3

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    In order to investigate the microscopic origin of the transitions at T-MI similar to 16.5K and T* similar to 14K in filled skutterudite compound SmRu4P12, we have carried out P-31-NMR measurements using a single crystal sample. The drastic change in the NMR line-shape below TMI was observed, which is attributed to the occurrence of some long-range magnetic ordering. The order is probably associated with octupole ordering as indicated from the NMR measurements on the powder sample of SmRu4P12. (c) 2006 Elsevier B.V. All rights reserved.

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  • Crystalline electric field effect and magnetic properties of CeRhSi3 single crystal Reviewed

    Y. Muro, M. Ishikawa, K. Hirota, Z. Hiroi, N. Takeda, N. Kimura, H. Aoki

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   76 ( 3 )   033706-1 - 033706-3   2007.3

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    We have studied the crystalline electric-field effect of the noncentrosymmetric heavy-fermion antiferromagnet CeRhSi3 by measuring the magnetic susceptibility chi(T), specific heat C-p(T) and inelastic neutron scattering. The 4f level scheme determined from X agrees with a magnetic excitation observed in the inelastic neutron spectra and the Schottky anomaly in the magnetic part of C, Moreover, we have measured C, under various magnetic fields B up to 8 T and observed that the Neel temperature T-N decreases proportionally to B-2 for B || a-axis while the B dependence of T-N is rather small for B || c-axis. This anisotropic behavior suggests that the antiferromagnetically ordered moments lie in the tetragonal c-plane.

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  • Raman scattering study of the skutterudite compounds Reviewed

    N. Ogita, R. Kojima, Y. Takasu, T. Hasegawa, T. Kondo, M. Udagawa, N. Takeda, T. Ikeno, K. Ishikawa, H. Sugawara, D. Kikuchi, H. Sato, C. Sekine, I. Shirotani

    Journal of Magnetism and Magnetic Materials   310 ( 2 )   948 - 950   2007.3

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    Raman scattering of skutterudite compounds RT4 X12 (R = La, Ce, Pr, Nd, Sm and Yb, T = Fe, Ru and Os, X = P and Sb) have been measured. All first-order Raman active phonons are observed and are assigned as the pnictogen vibrations. At the low energy region, the second-order phonons, including the vibration of the rare-earth ions with a flat phonon dispersion, are observed in the spectra of SmRu4 P12 and ROs4 Sb12. The second-order phonons can be observed for the sample with the larger cage space. The large displacement in the large cage space and the large density of state due to the flat phonon dispersion increase the intensity of the second-order Raman scattering process. The intensity of the second-order phonon are also affected by the valence of the rare-earth ions. © 2006 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.jmmm.2006.10.159

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  • Observation of two spin gap energies in the filled skutterudite compound CeOs(4)Sb(12) Reviewed

    D. T. Adroja, J. -G. Park, E. A. Goremychkin, K. A. McEwen, N. Takeda, B. D. Rainford, K. S. Knight, J. W. Taylor, Jeongmi Park, H. C. Walker, R. Osborn, Peter S. Riseborough

    PHYSICAL REVIEW B   75 ( 1 )   014418(1) - 014418(8)   2007.1

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    The optical conductivity of the Kondo insulator compound CeOs(4)Sb(12) reveals the formation of a 70 meV charge gap below 160 K. It also exhibits a weak shoulderlike structure at 30 meV, below 60 K. We have investigated CeOs(4)Sb(12) by inelastic neutron scattering techniques using incident neutron energies (E(i)) of 23 and 200 meV, at 5 and 176 K. Our measurements with E(i) = 200 meV show magnetic scattering centered near 50-60 meV and low-Q (similar to 3.8 angstrom(-1)) at 5 K, in addition to the continuum of magnetic scattering observed at 176 K. This clearly indicates the opening of a spin gap (or pseudogap ) of the order of 50 meV at 5 K in the strongly renormalized band near the Fermi energy. Furthermore, measurements with E(i) = 23 meV did not reveal any evidence of magnetic excitations below 20 meV, consistent with the scenario of a spin gap in CeOs(4)Sb(12). However, the estimated magnetic scattering deduced from the E(i) = 200 meV data reveals the presence of broad magnetic scattering between 25 and 80 meV centered near 27 meV, indicating a second energy scale with a gap energy of 27 meV. We interpret the 50 meV energy scale in terms of a direct gap, while the 27 meV energy scale corresponds to an indirect gap across the two hybridized bands. This gap energy of 27 meV is in good agreement with the so-called universal energy scale versus single ion Kondo temperature plot. We present the general features of spin gap systems such as CeOs(4)Sb(12) and CeRu(4)Sb(12), and discuss the role of crystal field excitations regarding the spin gap formation based on a theoretical model.

    DOI: 10.1103/PhysRevB.75.014418

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  • Magnetic Instability around the Quantum Critical Point in CeCoGe1-xSix(0<x<3) Reviewed

    D.Eom, N. Takeda, M.Ishikawa

    J.Phys.Soc.Jpn.   vol.75,No.9   093706(1) - 093706(3)   2006.12

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    DOI: 10.1143/JPSJ.75.093706

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  • Rattling and tunneling of off-center local oscillator in clathrate compounds Reviewed

    Terutaka Goto, Yuichi Nemoto, Takashi Yamaguchi, Tatsuya Yanagisawa, Takafumi Ueno, Tomoyuki Watanabe, Naoya Takeda, Osamu Suzuki, Hideaki Kitazawa, Hitoshi Sugawara, Hideyuki Sato

    PHYSICA B-CONDENSED MATTER   383 ( 1 )   115 - 119   2006.8

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    We have investigated an off-center local oscillator of a guest atom in cage of clathrate compounds R3Pd20Ge6 (R = La, Ce, Pr, Nd) and a filled skutterudite PrOs4Sb12 using ultrasonic measurements. The observation of ultrasonic dispersions in transverse C-44 mode of R3Pd20Ge6 and in transverse (C-11 - C-12)/2 mode of PrOs4Sb12 revealed the rattling of the off-center oscillator characterized by a relaxation time with Arrhenius-type temperature dependence. A low-temperature softening of C-44 in La3Pd20Ge6 below 3 K down to 20 mK and a softening of (C-11 - C-12)/2 in PrOs4Sb12 above the heavy Fermion superconducting transition indicate the charge fluctuation due to the degenerate off-center oscillators. (c) 2006 Elsevier B.V. All rights reserved.

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  • Raman scattering investigation of skutterudite compounds Reviewed

    N. Ogita, T. Kondo, T. Hasegawa, Y. Takasu, M. Udagawa, N. Takeda, K. Ishikawa, H. Sugawara, D. Kikuchi, H. Sato, C. Sekine, I. Shirotani

    PHYSICA B-CONDENSED MATTER   383 ( 1 )   128 - 129   2006.8

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    Raman scattering spectra of filled skutterudite RT4X12 (R = La, Ce, Pr, Nd, Sm and Y, T = Fe, Ru and Os, and X = Sb and P) and unfilled skutterudite CoP3 have been measured. All first-order Raman active phonons, which are due to the vibration of pnictogens, are observed. In addition, the crystal field excitations in PrRu4P12 spectra and the second-order phonons including rare-earth vibrations in SmRu4P12 and ROs4Sb12 are also observed. The second-order phonons can be observed for the sample with the larger cage space. The peak intensity of the second-order phonons decreases with decreasing temperature and vanishes at low temperature. Such a temperature dependence suggests that the second-order phonons are thermally excited and due to independent vibrations of the rare-earth ions, that is rattler motion. (c) 2006 Elsevier B.V. All rights reserved.

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  • Microscopic investigation of possible multipole ordering in SmRu4P12 by P-31-NMR Reviewed

    Satoru Masaki, Takeshi Mito, Naomi Oki, Shinji Wada, Naoya Takeda

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   75 ( 5 )   053708-1 - 053708-5   2006.5

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    To elucidate microscopically the metal-insulator transition (T-MI similar to 16.5 K) and an additional transition (T* similar to 15 K) in Sm-based filled skutterudite compound SmRu4R12, we have carried out P-31-NMR (nuclear magnetic resonance) at various fields from 0.8 to 11 T. The peaks in the spin lattice relaxation rate 1/T-1 observed at T-MI and T* under similar to 7T indicate that there are different magnetic fluctuation modes in SmRu4P12: one freezes below T-MI and the other does below T*. The anomalous field and temperature dependences of the NMR spectrum are explained in terms of the occurrence of multipole ordering. We have examined the two possible scenarios to account for the experimental results, and both cases suggest that the M-I transition involves octapole ordering.

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  • Ultrasonic dispersion and off-center rattling in heavy fermion superconductor PrOS4Sb12 Reviewed

    Yuichi Nemoto, Takafumi Ueno, Naoya Takeda, Takashi Yamaguchi, Tatsuya Yanagisawa, Terutaka Goto, Hitoshi Sugawara, Hideyuki Sato

    PHYSICA B-CONDENSED MATTER   378-80   184 - 186   2006.5

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    Ultrasonic attenuation measurements have been firstly performed for a large single crystal of PrOs4Sb12 with the dimensions of 5.97 x 0.6 x 0.6 mm(3). Remarkable frequency dependence around 20-40K has been observed in the elastic constant and attenuation coefficient of the longitudinal C-11 mode associated with E-g symmetry strain in part, which results from a thermally activated off-center rattling with E-g symmetry of a Pr ion inside a Sb icosahedron cage. Parameters of a characteristic time tau(0) = 3.1 x 10(-11) s and an activation energy E = 225 K were obtained. This E-g rattling involving a local charge fluctuation inside a Sb cage periodically arranged may couple to the conduction electrons. As a result, the electron-phonon coupling would lead to heavy fermion and its superconductivity in PrOs4Sb12. (c) 2006 Elsevier B.V. All rights reserved.

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  • NMR study of unique properties in SmRu4P12 Reviewed

    T Mito, S Masaki, N Oki, S Noguchi, S Wada, N Takeda, D Kikuchi, H Sato, H Sugawara, GQ Zheng

    PHYSICA B-CONDENSED MATTER   378-80   224 - 225   2006.5

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    We have carried out P-31-NMR (nuclear magnetic resonance) studies on Sm-based filled skutterudite compounds SmRu4P12. The measurements of NMR spectrum at various fields (H's) give evidence that spontaneous internal field occurs below the metal-insulator transition temperature T-M1 similar to 16.5 K. Concomitantly H-induced local field was observed between two successive transition temperatures, T* (similar to 14K) &lt; T &lt; T-M1, suggesting that some multipole ordering coexists with dipole ordering in this compound. (c) 2006 Elsevier B.V. All rights reserved.

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  • Heavy fermion fluid in high magnetic fields: An infrared study of CeRu4Sb12 Reviewed

    SV Dordevic, KSD Beach, N Takeda, YJ Wang, MB Maple, DN Basov

    PHYSICAL REVIEW LETTERS   96 ( 1 )   017403(1) - 017403(4)   2006.1

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    We report a comprehensive infrared magnetospectroscopy study of a CeRu4Sb12 compound revealing quasiparticles with a heavy effective mass m(*), with a detailed analysis of optical constants in fields up to 17 T. We find that the applied magnetic field strongly affects the low-energy excitations in the system. In particular, the magnitude of m*similar or equal to 70 m(b) (m(b) is the quasiparticle band mass) at 10 K is suppressed by as much as 25% at 17 T. This effect is in quantitative agreement with the mean-field solution of the periodic Anderson model augmented with a Zeeman term.

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  • Probing the vortex state of PrRu4Sb12 through muon spin rotation and relaxation Reviewed

    DT Adroja, AD Hillier, JG Park, EA Goremychkin, KA McEwen, N Takeda, R Osborn, BD Rainford, RM Ibberson

    PHYSICAL REVIEW B   72 ( 18 )   184503(1) - 184503(7)   2005.11

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    We have investigated the magnetic penetration depth lambda and the superconducting coherence length xi in the vortex lattice of the filled skutterudite compound PrRu4Sb12 (T-c similar to 0.97 K) using transverse-field muon-spin rotation measurements. Zero-field and longitudinal-field studies were also carried out to investigate the time-reversal symmetry of the superconducting state. We found lambda=3650(20) angstrom and xi=345(5) angstrom at 0.05 K and using these values of lambda and xi, together with the Sommerfeld constant we have calculated an effective mass of the quasiparticles m(*)approximate to 10m(e) and superfluid carrier density n(s)approximate to 4x10(27) carriers/m(3). The temperature dependence of the vortex state muon-spin relaxation rate sigma(s)(T) is consistent with the phenomenological two-fluid model. Further, the zero-field and longitudinal field measurements do not reveal any signature of a spontaneous internal magnetic field below the superconducting transition temperature, indicating the preservation of time-reversal symmetry in the superconducting state of PrRu4Sb12, unlike the broken time-reversal symmetry of the superconducting state of the heavy-fermion superconductor PrOs4Sb12.

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  • Novel superconductivity coexisting with incipient electric-multipolar order in CePt3Si Reviewed

    M Ishikawa, S Yamashita, Y Nakazawa, N Wada, N Takeda

    JOURNAL OF PHYSICS-CONDENSED MATTER   17 ( 23 )   L231 - L234   2005.6

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    We measured the specific heat C-p of an annealed sample of CePt3Si in magnetic fields B up to 10 T and confirmed two conspicuous anomalies in the temperature range where no apparent magnetic anomalies were found in the susceptibility. The lower-temperature anomaly at 2.2 K was depressed with increasing B and seemed to get absorbed around 4 T into the other one around 2.8 K. The latter anomaly continues to grow into a solid peak with increasing B. These features imply that neither of these transitions is due to long-range antiferromagnetism (AF) as originally proposed, but they are reminiscent of quadrupolar transitions found in certain Ce-based Kondo compounds, in which two distinct anomalies were also observed in C-p and identified as a quadrupolar transition followed by an AF transition at a slightly lower T. In the case of CePt3Si, the lower-T anomaly is not due to AF but to a new phase transition of yet-unknown nature, and in this new phase the superconductivity emerges at 0.8 K. We thereby hypothesize that the superconductivity could be mediated by magnetic or other electronic excitations under the influence of the quadrupolar-like order induced around 2.8 K and that CePt3Si would be the first example of an unconventional superconductor coexisting with electric-multipolar order.

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  • NMR study of the new filled skutterudite superconductor YFe4P12 Reviewed

    K Magishi, T Saito, K Koyama, Shirotani, I, Y Shimaya, K Kihou, C Sekine, N Takeda, M Ishikawa, T Yagi

    PHYSICA B-CONDENSED MATTER   359   883 - 885   2005.4

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    We report the results of P-31 NMR measurements on YFe4P12, a new member of the family of the filled skutterudite compounds, which displays superconductivity below T-c = 7 K. In the normal state, the nuclear spin-lattice relaxation time T-1 obeys the Korringa relation T1T = constant below 40 K, but it changes its behavior at higher temperatures. The Korringa constant (T1T)(-1) for YFe4P12 is smaller than that for LaFe4P12, suggesting that the density of states at Fermi energy N(E-F) for YFe4P12 is lower than the case of LaFe4P12. In the superconducting state, T-1(-1)(T) shows a small coherence peak just below Tc, followed by an exponential decrease below 4 K revealing on energy gap 2 Delta(0)/k(B)T(c) = 3.3. Our results indicate that YFe4P12 is a conventional type s-wave superconductor. (c) 2005 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.physb.2005.01.333

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  • Influence of the crystal field potential on the superconducting properties of PrRU(4)Sb(12) Reviewed

    DT Adroja, JG Park, EA Goremychkin, N Takeda, M Ishikawa, KA McEwen, R Osborn, AD Hillier, BD Rainford

    PHYSICA B-CONDENSED MATTER   359   983 - 985   2005.4

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    We have determined the crystal field potential of the superconductor PrRu(4)Sb(12) (T(c) similar to 0.9 K) using inelastic neutron scattering. The ground state of the Pr(+3) ions in T(h) point group symmetry is a Gamma(1) singlet with a Gamma(5) triplet at an energy of Delta similar to 5.6meV. Comparison with recent results on the PrOs(4)Sb(12) compound, where T(c) similar to 1.85 K and Delta similar to 0.6 meV, supports the conjecture that inelastic quadrupolar fluctuations (or aspherical Coulomb scattering) are responsible for the strong enhancement of T(c). In PrRu(4)Sb(12), the effect is reduced by the higher energy of the first excited level. (c) 2005 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.physb.2005.01.286

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  • Nonmagnetic heavy-fermion superconductor, CePt3Si Reviewed

    M Ishikawa, N Takeda

    SOLID STATE COMMUNICATIONS   133 ( 4 )   249 - 251   2005.1

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    We have studied the effect of heat treatment and the Ge substitution in place of Si in the recently discovered heavy-fermion superconductor CePt3Si. The annealed CePt3Si exhibited nonmagnetic heavy-fermion behavior instead of the antiferromagnetism (AF) found in quenched samples. The AF state was destroyed by only about 1 at.% of Ge-substitution and may not be a stable phase. Specific-heat measurements on the annealed CePt3Si and the Ge-substituted samples revealed a large hump around 2.2 K, originally claimed as Neel temperature. Its true nature is not clarified yet but conjectured at present as a sort of quadrupolar transition rather than AF long-range order. The superconducting transition around 0.75 K was equally sharp with DeltaC(P)/gammaT(c) = 0.7 for clean quenched and annealed samples. The interplay between the 2.2 K-anomaly and the superconductivity is discussed. (C) 2004 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.ssc.2004.10.032

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  • 24pTA-15 Magnetism and superconductivity of CePt_3Si studied by specific heat

    Ishikawa M., Yamashita S., Nakazawa Y., Wada N., Takeda N.

    Meeting Abstracts of the Physical Society of Japan   60   497 - 497   2005

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    DOI: 10.11316/jpsgaiyo.60.1.3.0_497_4

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  • Anomalous magnetic properties and non-Fermi-liquid behaviour in single crystals of the Kondo lattice CeNiGe2-xSix Reviewed

    DY Kim, DH Ryu, JB Hong, JG Park, YS Kwon, MA Jung, MH Jung, N Takeda, M Ishikawa, S Kimura

    JOURNAL OF PHYSICS-CONDENSED MATTER   16 ( 46 )   8323 - 8334   2004.11

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    We report on the magnetic susceptibility, specific heat and electrical resistivity of the heavy fermion compounds CeNiGe2-xSix (0 less than or equal to x less than or equal to 1). Compounds with x &lt; 1 show anti ferro magnetic order, which with increasing x shifts toward lower temperature owing to increased exchange coupling between the localized 4f magnetic moments and conduction electrons. Eventually, the magnetic order almost becomes absent, for x = 1. An anomaly observed in the specific heat is well interpreted by the Kondo model for a degenerate impurity spin J = 1/2 in the Coqblin-Schrieffer limit. A coherence peak indicative of the formation of a Kondo lattice is found in the electrical resistivity, whose features are consistent with the results for the specific heat. Interestingly, there is a significant deviation from Fermi-liquid behaviour at the critical concentration x = 1. This deviation is attributed to a quantum phase transition in a model with two-dimensional antiferromagnetic fluctuations.

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  • Effect of pressure on the electrical resistivity of CeCu2Si2 Reviewed

    Masahito Koeda, Masato Hedo, Yoshiya Uwatoko, Takehiko Matsumoto, Naoya Takeda, Masayasu Ishikawa

    JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS   272   E175 - E176   2004.5

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    We have performed electrical resistivity measurements at different pressures on two kinds of samples (low-T-c and high-T-c), which differ in physical properties of the heavy-fermion superconductor CeCu2Si2. It was found that one with lower T-c shows partial derivative T-c/partial derivative P of negative and the other with higher T-c shows partial derivative T-c/partial derivative P of positive. Therefore, the superconductivity for these two samples may have different origins. (C) 2003 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.jmmm.2003.11.103

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  • Study of the hybridization gap in a heavy fermion compound: CeRu4Sb12 Reviewed

    D. T. Adroja, J. -G. Park, K. A. McEwen, N. Takeda, M. Ishikawa, J. -Y. So

    JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS   272   E21 - E22   2004.5

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    We have investigated the temperature and momentum dependence of the inelastic neutron scattering response of CeRu4Sb12. Our neutron scattering study shows the opening of a Q-independent spin gap of 30 meV in the excitation spectrum, which is smaller than the charge gap of 47 meV observed in optical studies. The spin gap is nearly temperature independent below 100 K, while above this temperature the gap starts to fill up and at higher temperatures the magnetic response becomes purely quasielastic. We discuss the origin of the spin gap and consider the difference between the magnitude of the spin and charge gaps on the basis of theoretical models. (C) 2004 Elsevier B. V. All rights reserved.

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  • Competition between Kondo effect and ferromagnetic interaction in skutterudite La1-xSmxFe4P12 Reviewed

    N Takeda, M Ishikawa

    JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS   272   64 - 65   2004.5

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    We present the magnetic properties of a filled skutterudite La1-xSmxFe4P12. SmFe4P12 is a heavy ferimon compound with a novel ferromagnetic ground state. The magnetic susceptibility for x less than or equal to 0.4 shows a nearly temperature-independent Pauli paramagnetism, but samples for 0.6 less than or equal to x less than or equal to 0.85 reveals a broad maximum around 15 K. The origin of the maximum is discussed. (C) 2003 Elsevier B.V. All rights reserved.

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  • Spin gap formation in the heavy fermion skutterudite compound CeRu4Sb12 Reviewed

    D. T. Adroja, J.-G. Park, K. A. McEwen, N. Takeda, M. Ishikawa, J.-Y. So

    Phys. Rev.B   68   094425(1) - 094425(6)   2003.12

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  • Ferromagnetic Heavy Fermion System SmFe4P12 Reviewed

    N. Takeda, M. Ishikawa

    PhysicaB   329-333   460 - 461   2003.12

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    DOI: 10.1016/S0921-4526(02)02031-8

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  • Pairing Symmetry in two distinct superconducting states of CeCu2Si2 Reviewed

    M. Ishikawa, N. Takeda, M. Koeda, M. Hedo, Y. Uwatoko

    Phys. Rev.B   68   024522(1) - 024522(5)   2003.12

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  • Structural, electrical, and magnetic properties of a series of molecular conductors based on BDT-TTP and lanthanoid nitrate complex anions (BDT-TTP=2,5-bis(1,3-dithiol-2-ylidene)-1,3,4,6-tetrathiapentalene) Reviewed

    HB Cui, T Otsuka, A Kobayashi, N Takeda, M Ishikawa, Y Misaki, H Kobayashi

    INORGANIC CHEMISTRY   42 ( 19 )   6114 - 6122   2003.9

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    The platelike crystals of a series of novel molecular conductors, which are based on the pi-donor molecules BDT-TTP (2,5-bis(1,3-dithiol-2-ylidene)-1,3,4,6-tetrathiapentalene) with a tetrathiapentalene skeleton and lanthanide nitrate complex anions [Ln(NO3)(x)](3-x) (Ln = La, Ce, (Pr), Tb, Dy, Ho, Er, Tm, Yb, Lu) with localized 4f magnetic moments, were synthesized. Except for the Ce complex, the salts were composed of (BDT-TTP)(5)[Ln(NO3)(5)] and were isostructural. Even though the Ce crystal had a different composition, (BDT-TTP)(6)[Ce(NO3)(6)](C2H5OH)(x) (x approximate to 3), the crystals all had the space group P (1) over bar. Although the X-ray examination of the Pr salts was insufficient, the existence of two modifications was suggested in these systems by preliminary X-ray examination. Previously, we reported the crystal structures and unique magnetic properties of (BDT-TTP)(5)[Ln(NO3)(5)] (Ln = Sm, Eu, Nd, Gd). Thus, by combining the results of this work with previous one, we for the first time succeeded in obtaining a complete set of organic conductors composed of the identical pi-donors (BDT-TTP in this case) and all the lanthanide nitrate complex anions (except the complex with Pm3+). The crystals were all metallic down to 2 K. Electronic band structure calculations resulted in two-dimensional Fermi surfaces, which was consistent with their stable,metallic states. Except for the Lu complex, which lacked paramagnetic moments, the magnetic susceptibilities were measured on the six heavy lanthanide ion complex salts by a SQUID magnetometer (Ln = Tb, Dy, Ho, Er, Tm, Yb). The large paramagnetic susceptibilities, which were caused by the paramagnetic moments of the rare-earth ions, were obtained. The Curie-Weiss law fairly accurately reproduced the temperature dependence of the magnetic susceptibilities of (BDT-TTP)(5)[Ho(NO3)(5)] in the experimental temperature range (2-300 K) and-a comparatively large Weiss temperature (\Theta\) was obtained (Theta(Ho) = -15 K). A Weiss temperature (Theta(Tm) = -8 K) was also obtained for Tm. The \Theta\ values of other (BDT-TTP)(5)[Ln(NO3)(5)] salts and (BDT-TTP)(6)[Ce(NO3)(6)](C2H5OH)(x)(x approximate to 3) were as follows: \Theta\/K = 4 (Er), less than or equal to2 (Ce, Tb, Dy, Yb). The comparatively strong intermolecular magnetic interaction between Ho3+ ions, which was suggested by the \Theta\ value, is inconsistent with the traditional image of strongly localized 4f orbitals shielded by the electrons in the outer 5s and 5p orbitals. The dipole interactions between Ln(3+) ions causing the Curie-Weiss behavior and the comparatively large Theta value of (BDT-TTP)(5)[Ho(NO3)(5)] is inconsistent with the data, since the complexes exhibit isostructural properties and there is not a clear relationship between the magnitudes of Theta values and those of magnetic moments. Therefore, it is possible that the 4f orbitals of Ho atom are sensitive to the ligand field, which will have an effect on the orbital moment of the Ho3+ ion and/or produce a small amount of mixing between 4f and ligand orbitals to give rise to "real" intermolecular antiferromagnetic interaction through intermolecular overlapping between pi (BDT-TTP) and ligand orbitals of lanthanide nitrate complex anions.

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  • Superconductivity of new filled skutterudite YFe4P12 prepared at high pressure Reviewed

    I. Shirotani, Y. Shimaya, K. Kihou, C. Sekine, N. Takeda, M. Ishikawa, T. Yagi

    Journal of Physics Condensed Matter   15 ( 28 )   S2201 - S2205   2003.7

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    A new filled skutterudite YFe4P12 has been prepared at high temperatures and high pressures. The electrical resistivity and dc magnetic susceptibility of this compound were measured at low temperatures. The superconductity in YFe4P12 is observed at around 7 K. This phosphide is a new superconductor. The specific heat of YFe4P12 has been studied between 2 and 20 K. The specific heat fitted to the expression C = γT + βT3, by a least squares analysis, yielded the values γ = 27.2 mJ mol-1 K-2 and β= 0.195 mJ mol-1 K-4. The Debye temperature (ΘD) is found to be 553 K. The electronic density of the states at the Fermi energy for YFe4P12 is 0.45 state eV-1/atom.

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  • Non-Fermi-liquid behavior in CeNiGe2-xSix single crystals Reviewed

    SO Hong, ED Mun, N Takeda, M Ishikawa, YS Kwon

    PHYSICA B-CONDENSED MATTER   329   518 - 519   2003.5

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    The specific heat in low temperature regions was measured for several pseudoternary compounds of the CeNiGe2-xSix System. Substitution of silicon for germanium enhances the coupling constant J and the Kondo interaction. The antiferromagnetism in CeNiGe2 is ultimately suppressed around x = 1 by the enhanced Kondo effect. A non-Fermi liquid behavior has been observed in x = 1 composition. (C) 2003 Elsevier Science B.V. All rights reserved.

    DOI: 10.1016/S0921-4526(02)02211-1

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  • The ferromagnetic Kondo-lattice compound SmFe4P12 Reviewed

    Naoya Takeda, Masayasu Ishikawa

    Journal of Physics Condensed Matter   15 ( 14 )   L229 - L233   2003.4

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    We report on the magnetic properties of a filled skutterudite compound, SmFe4P12. Magnetic susceptibility and specific heat measurements revealed a ferromagnetic transition at 1.6 K. The temperature dependence of the electrical resistivity exhibits a Kondo-lattice behaviour and the electronic specific heat coefficient attains values as large as 370 mJ mol-1 K-2. This compound is thereby the first Sm-based heavy-fermion system found with a ferromagnetic ground state. The Kondo temperature is estimated to be about 30 K.

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  • Electronic structure of the filled skutterudite compound CeRu4Sb12 Reviewed

    K. Kanai, N. Takeda, S. Nozawa, T. Yokoya, M. Ishikawa, S. Shin

    Phys.Rev.B.   65   41105(1) - 41105(4)   2002.12

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  • Ultrahigh resolution photoemission study of CeRu4Sb12 Reviewed

    K. Kanai, N. Takeda, S. Nozawa, T. Yokoya, M. Ishikawa, S. Shin

    Journal of Physics and Chemistry of Solids   63 ( 6-8 )   1175 - 1178   2002

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    Ultrahigh-resolution photoemission spectroscopy reveals the crossover behavior of CeRu4Sb12 into a low carrier state. The density of states (DOS) around the Fermi level (EF) decreases on lowering the temperature. The temperature dependence of the DOS at EF is consistent with the results of the transport measurements and explained in terms of the development of the coherence. © 2002 Published by Elsevier Science Ltd.

    DOI: 10.1016/S0022-3697(02)00019-7

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  • Ferromagnetic interaction and superconductivity of CeCu2Si2 Reviewed

    M. Ishikawa, N. Takeda, P. Ahmet, Y. Karaki, H. Ishimoto, D. Huo, J. Sakurai

    Journal of Physics and Chemistry of Solids   63 ( 6-8 )   1165 - 1169   2002

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    We have recently reported our finding of a weakly ferromagnetic phase and two superconducting phases in the Cu-deficient and Cu-rich region of the homogeneity range, respectively, for the heavy-electron compound CeCu2Si2. We herein report more detailed results of the specific heat, magnetic susceptibility, resistivity (R), magnetoresistance (ΔR) and thermopower for many different compositions. We confirmed the slightly re-entrant behavior in the Hc2(T) curve and a change of regime in the ΔR at about 0.35 K above Hc2(T) for the low-Tc phase. Above about 0.75 K, the normal state of this phase exhibited no magnetoresistance up to 70 kOe, while that of high-Tc phase and the weakly ferromagnetic phase did a slightly positive ΔR. These differences in the three phases may provide an important clue to better understanding of the heavy-electron superconductivity of CeCu2Si2. © 2002 Elsevier Science Ltd. All rights reserved.

    DOI: 10.1016/S0022-3697(02)00120-8

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  • Electronic structure of the filled skutterudite compound (formula presented)

    K. Kanai, N. Takeda, S. Nozawa, T. Yokoya, M. Ishikawa, S. Shin

    Physical Review B - Condensed Matter and Materials Physics   65 ( 4 )   1 - 4   2002

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    Ultrahigh-resolution photoemission spectra of (formula presented) reveal crossover behavior into a low carrier state. The density of states (DOS) around the Fermi level (formula presented) decreases on lowering temperature and the semimetalliclike DOS is observed at 5.9 K. The temperature dependence of DOS at (formula presented) is explained in terms of the development of the coherence. The smaller hybridization strength between the Ru- (formula presented) state and the (formula presented) state prevents the hybridization gap from opening in (formula presented) which is realized in (formula presented). © 2002 The American Physical Society.

    DOI: 10.1103/PhysRevB.65.041105

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  • Ferromagnetic exchange coupling of vanadium(IV) d pi spins across pyrimidine rings: Dinuclear complexes of oxovanadium(IV) bis(1,1,1,5,5,5-hexafluoropentane-2,4-dionate) bridged by pyrimidine derivatives Reviewed

    T Ishida, S Mitsubori, T Nogami, N Takeda, M Ishikawa, H Iwamura

    INORGANIC CHEMISTRY   40 ( 27 )   7059 - 7064   2001.12

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    Dinuclear oxovanadium(IV) complexes bridged by pyrimidine derivatives, L[VO(hfac)(2)](2) [L = pyrimidine (PM), 4-methylpyrimidine (MPM), 4,6-dimethylpyrimidine, 4-aminopyrimidine, and quinazoline; hfac = 1,1,1,5,5,5-hexafluoropentane-2,4-dionate], were synthesized and characterized. All of them showed intramolecular ferromagnetic interaction, and the magnetic susceptibilities were analyzed on the basis of the singlet-triplet model, giving 2J/k(B) = 2.2-5.5 K. PM[VO(hfac)(2)](2) crystallized in a monoclinic space group C2/c with a = 34.092(2), b = 6.9783(4), and e = 16.4940(9) Angstrom, beta = 109.104(1)degrees, V = 3707.8(4) Angstrom (3), and Z = 4 for C24H8F24N2O10V2, and MPM[VO(hfac)(2)](2) gave isomorphous crystals. A semiempirical calculation study based on the determined structure suggests the presence of d pi -p pi interaction between vanadium and pyrimidine nitrogen atoms. Ferromagnetic coupling is explained in terms of a spin-polarization mechanism across the pyrimidine bridge. The intermolecular ferromagnetic interaction of PM[VO(hfac)(2)](2) call be interpreted by the contact between the spin-polarized pyrimidine moiety and the oxovanadium oxygen atom in an adjacent molecule.

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  • The effect of La substitution and magnetic field on non-Fermi-liquid behaviour in CeRu4Sb12 Reviewed

    N Takeda, M Ishikawa

    JOURNAL OF PHYSICS-CONDENSED MATTER   13 ( 26 )   5971 - 5980   2001.7

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    CeRu4Sb12 with the filled skutterudite structure exhibits a novel non-Fermi-liquid (NFL) behaviour in the low-temperature specific heat and electrical resistivity at ambient pressure. We investigated the effect of La substitution and magnetic field on the NEL state and found that it can be easily destroyed either by the application of a magnetic field or by a small degree of La substitution. In magnetic fields, CIT becomes strongly depressed and nearly constant below 1 K and rho (T) turns to following a T-2-law, implying that the Fermi-liquid state recovers in high magnetic fields. The type of critical fluctuation is discussed on the basis of the results of magnetic susceptibility, electrical resistivity and specific heat measurements.

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  • Magnetic Field effect on Non-Fermi Liquid Behaviors in CeRu4Sb12. Reviewed

    N. Takeda, M. Ishikawa

    PhysicaB   281-282   388 - 390   2000.12

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  • Superconductivity and Magnetic Properties of Filled Skutterudite Compounds RERu4Sb12 (RE=La, Ce, Pr, Nd and Eu). Reviewed

    N. Takeda, M. Ishikawa

    J. Phys. Soc. Jpn.   69   868 - 873   2000.12

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  • Third-order Magnetic Susceptibility and Quadrupolar Parameter of Kondo-lattice compound Ce<SUB>3</SUB> Pd<SUB>20</SUB> Ge<SUB>6</SUB> Reviewed

    J. Kitagawa, N. Takeda, M. Ishikawa, M. Nakayama, N. Kimura, T. Komatsubara

    Journal of Physical Society of Japan   69 ( 3 )   883 - 887   2000.3

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    We present a report on crystalline-electric-field effects observed in the electrical resistivity and the specific heat of Ce3Pd20Ge6, which are discussed within an energy level scheme of the Γ8 ground state and the Γ7 excited state at 50 K for both inequivalent crystallographic sites of Ce atom.The third-order magnetic susceptibility was deduced from the magnetization measurement in the paramagnetic phase of a single-crystalline sample in magnetic fields applied along [0 0 1] and [1 1 1].In order to explain the temperature dependence of the third-order magnetic susceptibility along [0 0 1], a positive total quadrupolar pair interaction constant of 22 mK is required in addition to a small antiferromagnetic exchange interaction, thereby suggesting ferroquadrupolar ordering with the Γ3 symmetry in this compound.

    DOI: 10.1143/JPSJ.69.883

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  • Jahn-Teller-like phase transition of TmPd3S4 around 200 K Reviewed

    J Kitagawa, E Matsuoka, N Takeda, M Ishikawa

    PHYSICAL REVIEW B   60 ( 22 )   R15028 - R15030   1999.12

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    We report a Jahn-Teller-like phase transition in a synthesized metallic compound, TmPd3S4, of the cubic NaPt3O4 structure type. The transition causes a very large thermal hysteresis in the electrical resistivity between 120 and 230 K and a modulated structure with a modulation vector of about 1/8a* (a*: reciprocal-lattice unit vector) at lower temperatures which was revealed by a low-temperature x-ray powder diffraction. Analyses on the low-temperature specific heat and the magnetic susceptibility suggest that the compound becomes an exchange-induced moment antiferromagnet (T-N=1.1 K) by the nonmagnetic singlet ground state of Tm3+ ions. [S0163-1829(99)51146-6].

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  • Anisotropic Magnetic Diagram of Ce<SUB>3</SUB>Pd<SUB>20</SUB>Ge<SUB>6</SUB> with Quadrupolar Ordering Reviewed

    J. Kitagawa, N. Takeda, M. Ishikawa, T. Yoshida, A. Ishiguro, N. Kimura, T. Komatsubara

    Physica B   259-261   332 - 333   1999.1

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    DOI: 10.1016/S0921-4526(98)01166-1

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  • Anomalous magnetic properties of CeRu4Sb12 Reviewed

    N. Takeda, M. Ishikawa

    Physica B: Condensed Matter   259-261   92 - 93   1999

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    We present the temperature dependence of the magnetic susceptibility χ(T), electrical resistivity ρ(T) and low-temperature specific heat C(T) of CeRu4Sb12. χ(T) shows a broad peak around 100 K characteristic to intermediate-valence compounds but the small Weiss temperature of -26 K and ρ(T) suggest that the compound is classified as a Kondo compound. The ground state is very anomalous and non-Fermi liquid behaviors were observed in C/T and ρ(T) at low temperatures. © 1999 Elsevier Science B.V. All rights reserved.

    DOI: 10.1016/S0921-4526(98)01167-3

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  • Contrasting Kondo-Lattice Behavior of CeTSi3 and CeTGe3 (T=Rh and Ir). Reviewed

    Y. Muro, D. Eom, N. Takeda, M. Ishikawa

    J. Phys. Soc. Jpn.   67   3601 - 3604   1998.12

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  • Suppression of Antiferromagnetism by Kondo Effect and Quantum Critical Behavior in CeCoGe3-xSix (0 ≤ x ≤ 3) Reviewed

    Duhwa Eom, Masayasu Ishikawa, Jiro Kitagawa, Naoya Takeda

    Journal of the Physical Society of Japan   67 ( 7 )   2495 - 2500   1998

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    Several pseudoternary compounds of the CeCoGe3-xSix system were studied by magneticsusceptibility, electrical-resistivity and specific-heat measurements. Substitution of silicon for germanium generates the normal chemical pressure and enhances the exchange interaction. The antiferromagnetism in CeCoGe3 is ultimately suppressed around x = 1.2 by the enhanced Kondo effect. Non-Fermi liquid-like behavior has been observed around the critical concentration and an intermediate-valence regime with a very high Kondo temperature of the order of 900 K is followed farther on in the silicon rich region.

    DOI: 10.1143/JPSJ.67.2495

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  • Anisotropic magnetic phase diagram of the Kondo-lattice compound Observation of antiferromagnetic and quadrupolar ordering Reviewed

    J. Kitagawa, N. Takeda, M. Ishikawa, T. Yoshida, A. Ishiguro, N. Kimura, T. Komatsubara

    Physical Review B - Condensed Matter and Materials Physics   57 ( 13 )   7450 - 7453   1998

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    From the measurement of the specific heat of single crystalline samples of (Formula presented) we have constructed magnetic phase diagrams for a magnetic field up to 4 T, which disclose a pronounced anisotropy along the three principal directions of [100], [110], and [111]. We have found that both the quadrupolar and antiferromagnetic ordering temperatures exhibit distinct directional dependences on the external magnetic field and that new phase transitions evolve in the antiferromagnetic phase as well as in the ordered quadrupolar phase. These facts strongly suggest the existence of a complicated form of anisotropic interaction between the electric quadrupolar moment and the magnetic dipolar moment. The present result is briefly discussed in comparison with the reported one for (Formula presented). © 1998 The American Physical Society.

    DOI: 10.1103/PhysRevB.57.7450

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  • Hydrogen-bonded organic ferromagnet Reviewed

    Michio M. Matsushita, Akira Izuoka, Tadashi Sugawara, Tatsuya Kobayashi, Nobuo Wada, Naoya Takeda, Masayasu Ishikawa

    Journal of the American Chemical Society   119 ( 19 )   4369 - 4379   1997.5

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    Nitronyl nitroxide derivatives carrying a hydroquinone or a resorcinol moiety 2-(2',5'-dihydroxyphenyl)4,4,5,5-tetramethyl-4,5-dihydro-1H- imidazolyl-1-oxyl-3-oxide (HQNN) and 2-(3',5'-dihydroxyphenyl)-4,4,5,5- tetramethyl-4,5-dihydro-1H-imidazolyl-1-oxyl 3-oxide (RSNN)) have been designed and prepared. These compounds were found to afford hydrogen-bonded crystals. In the case of HQNN, two phases of crystals (α- and βHQNN) were obtained. Of these, the crystal structure of α-HQNN is characterized by the intramolecular hydrogen bond between the o-hydroxy group and the nitronyl nitroxide and by the intermolecular one-dimensional hydrogen-bonded chain between the o- and p-hydroxy groups of the neighboring molecules, respectively. Two of the hydrogen-bonded chains run in parallel, and they are connected by the bifurcated hydrogen bonds formed between the o-hydroxy groups of the facing molecules in the individual chain. The χT value of this crystal increased monotonously with lowering temperature (ST model, J = +0.93 K, Θ= +0.46 K) and turned out to exhibit a ferromagnetic phase transition at 0.5 K. On the basis of the heat capacity data, α-HQNN was found to be a three-dimensional ferromagnet. On the other hand, the crystal of β-HQNN was characterized by the intermolecular hydrogen-bonded chain formed between the hydroxy group at the meta position and the nitronyl nitroxide and by the interchain π-π stacking. The magnetic interaction of β-HQNN was interpreted by the ferromagnetic ST model, and this ferromagnetic interaction (J = +5.0 K) was accompanied by a weak antiferromagnetic interaction (Θ = - 0.32 K) at lower temperatures. Although the structural feature of the crystal of RSNN resembles that of the β-HQNN, it exhibited the antiferromagnetic interaction predominantly (ST model, J = + 10.0 K, Θ = -4.0 K). These magnetic behaviors are consistent with McConnell's theory, when the spin densities at the interacting sites connected by hydrogen bonds are taken into account. Thus, it may be concluded that the hydrogen bond plays a role not only in constructing hydrogen-bonded crystals but also in transmitting spin polarization along the hydrogen bond.

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  • Ferromagnetism of Organic Radical Crystals of TEMPO Derivatives. Reviewed

    T. Nogami, T. Ishida, M. Yasui, F. Iwasaki, H. Iwamura, N. Takeda, M. Ishikawa

    Mol. Cryst. Liq. Cryst.   279   97 - 106   1996.12

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  • Possible quadrupolar ordering in a Kondo-lattice compou Reviewed

    Jiro Kitagawa, Naoya Takeda, Masayasu Ishikawa

    Physical Review B - Condensed Matter and Materials Physics   53 ( 9 )   5101 - 5103   1996

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    Magnetic and transport properties of the cubic ternary compound (Formula presented)(Formula presented)(Formula presented) are herein reported. The electrical resistivity exhibits the Kondo lattice behavior and a large (Formula presented) coefficient at low temperatures, indicating that this compound is a heavy-electron system with a Kondo temperature of a few degrees Kelvin. The low-temperature specific heat revealed two successive anomalies at (Formula presented) K and (Formula presented) K. The (Formula presented) quartet crystalline-field ground state of Ce ions is conjectured from the thermal variation of magnetic entropy deduced from the specific-heat data. The anomaly at (Formula presented) is probably a result of quadrupolar interaction between (Formula presented) ground states, while the other one at (Formula presented) is due to antiferromagnetic ordering. © 1996 The American Physical Society.

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  • Ferromagnetism in Organic Radical Crystal of 4 - (p - Chlorobenzylideneamino) - 2, 2, 6, 6 - tetramethylpiperidin - 1 - oxyl. Reviewed

    T. Nogami, T. Ishida, H. Tsuboi, H. Yoshikawa, H. Yamamoto, M. Yasui, F. Iwasaki, N. Takeda, M. Ishikawa

    Chemistry Letters.   635 - 636   1995.12

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  • Intra- and inter-molecular ferromagnetic interaction of transition metal complexes containing pyrimidine or pyrazine derivatives Reviewed

    Takayuki Ishida, Shin-ichi Mitsubori, Takashi Nogami, Yoshimitsu Ishikawa, Masanori Yasui, Fujiko Iwasaki, Hiizu Iwamura, Naoya Takeda, Masayasu Ishikawa

    Synthetic Metals   71 ( 1-3 )   1791 - 1792   1995.4

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    The 1 2 spins of oxovanadium(IV) ions were ferromagnetically coupled with J kB = +1.1∼+2.7 K in the dinuclear complexes L[VO(hfac)2]2 (hfac = hexafluoroacetylacetonate, L = pyrimidine derivatives). Among them, a ferromagnetic transition was observed at about 0.14 K in PM[VO(hfac)2]2 (PM = pyrimidine). The polymeric complex QZ[Cu(hfac)2] (QZ = quinazoline) gave a positive Weiss constant (+0.39 K). The ferromagnetic transition was observed at about 0.12 K. © 1995.

    DOI: 10.1016/0379-6779(94)03052-8

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  • New organic ferromagnets: 4-arylmethyleneamino-2,2,6,6-tetramethylpiperidin-1-oxyl (aryl = phenyl, 4-biphenylyl, 4-chlorophenyl, and 4-phenoxyphenyl) Reviewed

    Takashi Nogami, Kensuke Togashi, Hidenori Tsuboi, Takayuki Ishida, Hajime Yoshikawa, Masanori Yasui, Fujiko Iwasaki, Hiizu Iwamura, Naoya Takeda, Masayasu Ishikawa

    Synthetic Metals   71 ( 1-3 )   1813 - 1814   1995.4

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    The title radicals were found to be bulk ferromagnets, as indicated by the sharp divergence of the susceptibility. Their transition temperatures were found in the range of 0.2-0.4 K. The X-ray crystal structure analysis of the phenyl, biphenylyl, and chlorophenyl derivatives at room temperature revealed that the crystal consisted of an almost two-dimensional network of the N-O sites. In the case of aryl = 2-naphthyl, metamagnetic behavior was observed below about 0.3 K. © 1995.

    DOI: 10.1016/0379-6779(94)03063-C

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  • New Heavy-Electron System Ce3Pd20Si6 Reviewed

    Naoya Takeda, Jiro Kitagawa, Masayasu Ishikawa

    Journal of the Physical Society of Japan   64 ( 2 )   387 - 390   1995

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    Magnetic and transport properties of the ternary compound Ce3Pd20Si6 are investigated down to 0.035 k. The temperature dependence of the electrical resistivity indicates that this compound is a new Kondo material. The low-temperature specific heat measurement reveals that C/T is strongly enhanced at low temperatures, reaching as high as 8 J/mole Ce·K2 at 0.2 k. This leads to the conclusion that Ce3Pd20Si6 is one of the heaviest-electron systems. © 1995, THE PHYSICAL SOCIETY OF JAPAN. All rights reserved.

    DOI: 10.1143/JPSJ.64.387

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  • Effect of Pressure on Specific Heat of Kondo Lattice System Ce_3Pd_<20>Si_6

    Hashiguchi T., Takeda N., Kitagawa J., Wada N., Takayanagi S., Ishikawa M., Mori N.

    Meeting Abstracts of the Physical Society of Japan   1995   155 - 155   1995

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  • An Organic Ferromagnet:alpha-Phase Crystal of 2 - (2', 5' - Dihydroxyphenyl) - 4, 4, 5, 5 - tetramethyl - 4, 5 - dihydro - 1H - imidazolyl - 1 - oxy - 3 - oxide (alpha- HQNN). Reviewed

    T. Sugawara, M. M. Matsushita, A. Izuoka, N. Wada, N. Takeda, M. Ishikawa

    J. Chem. Soc., Chem. Commun.   1723   1994.12

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  • A New Organic Ferromagnet : 4 - Benzylideneamino - 2, 2, 6, 6 - tetramethylpiperidin - 1 - oxyl. Reviewed

    T. Nogami, K. Tomioka, T. Ishida, H. Yoshiika, M. Yasui, F. Iwasaki, H. Iwamura, N. Takeda, M. Ishikawa

    Chemistry Letters   29 - 32   1994.12

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  • An Organic Ferromagnet with a Tc of 0.4K. 4-(p-Phenylbenzylideneamino)-2,2,6,6-tetramethylpiperidin-1-oxyl

    T. Ishida, H. Tsuboi, T. Nogami, H. Yoshikawa, M. Yasui, F. Iwasaki, H. Iwamura, N. Takeda, M. Ishikawa

    Chem. Lett.   1994 ( 5 )   919 - 922   1994

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  • Fermi surface and cyclotron mass of extremely low carrier system CeAs Reviewed

    N. Takeda, Y. S. Kwon, Y. Haga, N. Sato, T. Suzuki, T. Komatsubara

    Physica B: Physics of Condensed Matter   186-188 ( C )   153 - 155   1993.5

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    The Fermi surface and the cyclotron mass of a semimetallic compound, CeAs, were determined by use of the dHvA effect. We have found that the cyclotron mass of the hole surface decreases with increasing field. CeAs is a dense Kondo system with low carrier concentration of 0.0024/formula unit. © 1993.

    DOI: 10.1016/0921-4526(93)90520-G

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  • PHYSICAL-PROPERTIES OF UPD2AL3 AT LOW-TEMPERATURE

    T SAKON, K IMAMURA, N TAKEDA, N SATO, T KOMATSUBARA

    PHYSICA B-CONDENSED MATTER   186-88   297 - 299   1993.5

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    We have measured specific heat, magnetic susceptibility and electrical resistivity of UPd2Al3 and UPd2Al3.03 single crystals. The temperature dependence of the specific heat of UPd2Al3 reveals that the superconducting gap function is anisotropic. We present the results of specific heat measurements of UPd2Al3.03, suggesting an additional phase transition around 0.6 K.

    DOI: 10.1016/0921-4526(93)90559-O

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  • Heavy-Electron Behavior in a Low-Carrier-Concentration Compound YbAs Reviewed

    Takuo Sakon, Noriaki Sato, Akira Oyamada, Naoya Takeda, Takashi Suzuki, Takemi Komatsubara

    Journal of the Physical Society of Japan   61 ( 7 )   2209 - 2211   1992

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    Low-temperature specific heat of YbAs has been measured down to about 50 mK. In the antiferromagnetic ordered state (TN∼0.5 K), the nuclear contribution is observed below about 150 mK. By subtraction of this contribution from the measured specific heat, the linear coefficient of the electronic specific heat is estimated to be about 270 mJ/K2 mole. This value is extraordinarily large because the carrier concentration in YbAs is of the order of 0.01 per formula unit. This large mass enhancement may be ascribed to a mutual 4f-spin compensation mechanism instead of the usual Kondo spin fluctuation. We also show that the magnetic field effect on the specific heat is rather small. © 1992, THE PHYSICAL SOCIETY OF JAPAN. All rights reserved.

    DOI: 10.1143/JPSJ.61.2209

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  • Anisotropy in a Heavy Fermion Superconductor: UPd2Al3 Reviewed

    Noriaki Sato, Takuo Sakon, Naoya Takeda, Takemi Komatsubara, Christoph Geibel, Frank Steglich

    Journal of the Physical Society of Japan   61 ( 1 )   32 - 34   1992

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    We report on the anisotropy of magnetization, electrical resistivity and upper critical magnetic fields (HC2) of UPd2Al3. The magnetization curve in the antiferromagnetically ordered state shows large anisotropy, indicating that the sublattice moments lie in the basal hexagonal plane. The value of 1(dHC2/dT) at Tc is estimated to be about 36 (kOe/K) for the magnetic field parallel and perpendicular to the hexagonal c-axis, and the upper critical field seems to be rather isotropic. © 1992, THE PHYSICAL SOCIETY OF JAPAN. All rights reserved.

    DOI: 10.1143/JPSJ.61.32

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  • A New Mass-Enhanced Ferromagnet: U2PtSi3 Reviewed

    Noriaki Sato, Masaki Kagawa, Katsunori Tanaka, Naoya Takeda, Takeo Satoh, Shinichi Sakatsume, Takemi Komatsubara

    Journal of the Physical Society of Japan   60 ( 3 )   757 - 759   1991

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    We have newly found and succeeded in growing a mass-enhanced ferromagnet U2PtSi3. The electronic specific heat coefficient is 200 mJ/K2 per mole of U. The magnetization shows no saturation up to 80 kOe for both the a- and c-axes. The magnitude of remanence is much smaller compared with the effective moment in the paramagnetic phase. Experimental results on single-crystalline samples are presented and discussed. © 1991, THE PHYSICAL SOCIETY OF JAPAN. All rights reserved.

    DOI: 10.1143/JPSJ.60.757

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  • DHVA EFFECT IN F-ELECTRON SYSTEMS Reviewed

    N TAKEDA, M KAGAWA, K TANAKA, A OYAMADA, N SATO, S SAKATSUME, T SUZUKI, T KOMATSUBARA

    JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS   90-1   425 - 427   1990.12

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    dHvA magnetization of U3P4 and YbAs has been measured. The measurement for U3P4 in the {1 1 0} plane shows a new branch. We have observed the dHvA effect in YbAs for the first time. The observed branches consist of ellipsoids of electron sheets. These sheets do not change its shape above and below T(N).

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  • Ce<sub>3</sub>Rh<sub>2</sub>Ge<sub>2</sub>の純良化と基礎物性

    川崎博己, 野本隆弘, 中野智仁, 武田直也

    日本物理学会講演概要集(CD-ROM)   74 ( 2 )   2019

  • かご状物質BaCu<sub>9</sub>Sn<sub>4</sub>の合成と基礎物性

    川辺健士郎, 野本隆宏, 中野智仁, 武田直也

    日本物理学会講演概要集(CD-ROM)   74 ( 2 )   2019

  • 反強磁性を示すCePtGe<sub>2</sub>の圧力効果

    郷地順, 大沼翔馬, 中野智仁, 武田直也, 上床美也

    高圧討論会講演要旨集   59th   2018

  • 1T-Ta(S<sub>2-x</sub>Se<sub>x</sub>)の熱電特性

    荒木遼太, 松本絋祐, 中野智仁, 武田直也

    日本物理学会講演概要集(CD-ROM)   73 ( 2 )   2018

  • 超低温におけるカゴ状化合物R<sub>3</sub>Pd<sub>20</sub>Ge<sub>6</sub>(R=La,Pr)の熱膨張測定

    岩上欧史, 矢尾優丞, 関口祐太, 南条知則, 阿部聡, 松本宏一, 阿野元貴, 赤津光洋, 三本啓輔, 根本祐一, 後藤輝孝, 武田直也, 北澤英明

    日本物理学会講演概要集(CD-ROM)   71 ( 1 )   ROMBUNNO.22APS‐9 - 2111   2016.3

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    DOI: 10.11316/jpsgaiyo.71.2.0_2111

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  • RO<sub>0.5</sub>F<sub>0.5</sub>BiCh<sub>2</sub>(R=希土類,Ch=S,Se)単結晶の超伝導特性

    照井祐輔, 齋藤健太, 加瀬直樹, 中野智仁, 武田直也

    日本物理学会講演概要集(CD-ROM)   71 ( 1 )   2016

  • α-Mnの圧力下物性測定

    福原慶, 寺島宗一郎, 加瀬直樹, 中野智仁, 武田直也, 雨海有佑, 村山茂幸

    高圧討論会講演要旨集   57th   2016

  • 1T-TaS<sub>2</sub>の圧力下熱電特性

    松本紘祐, 佐藤晴紀, 加瀬直樹, 中野智仁, 武田直也

    高圧討論会講演要旨集   57th   2016

  • La(O,F)Bi(S<sub>1-x</sub>Se<sub>x</sub>)<sub>2</sub>単結晶のSe置換量に対する超伝導状態の変化

    加瀬直樹, 照井祐輔, 中野智仁, 武田直也

    日本物理学会講演概要集(CD-ROM)   71 ( 2 )   2016

  • 22aBN-2 Superconducting state of the single crystal La(O,F)Bi(S_<1-x>Se_x)_2 by means of specific heat measurement

    Kase N., Terui Y., Saito K., Nakano T., Takeda N.

    Meeting Abstracts of the Physical Society of Japan   71 ( 0 )   2374 - 2374   2016

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    DOI: 10.11316/jpsgaiyo.71.1.0_2374

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  • 小型ブリッジマンアンビル圧力セルの開発とYb<sub>2</sub>Ni<sub>12</sub>P<sub>7</sub>の圧力下物性

    新井宏典, 上杉和哉, 佐藤亮平, 加瀬直樹, 中野智仁, 武田直也, 大橋政司, 巨海玄道

    高圧討論会講演要旨集   56th   2015

  • 圧力誘起超伝導体CePtSi<sub>2</sub>単結晶の圧力下ゼーベック係数

    山田和弘, 佐藤晴紀, 松本絋祐, 加瀬直樹, 中野智仁, 武田直也, 松林和幸, 上床美也

    高圧討論会講演要旨集   56th   2015

  • LaOBiCh<sub>2</sub>(Ch=S,Se)の単結晶育成と超伝導状態

    照井祐輔, 齋藤健太, 加瀬直樹, 中野智仁, 武田直也

    日本物理学会講演概要集(CD-ROM)   70 ( 2 )   2015

  • カゴ状物質(Y<sub>x</sub>Tm<sub>1-x</sub>)<sub>5</sub>Co<sub>6</sub>Sn<sub>18</sub>の磁性と超伝導

    古田沙紀子, 増村昌三, 穴田泰士, 加瀬直樹, 中野智仁, 武田直也

    日本物理学会講演概要集(CD-ROM)   70 ( 2 )   2015

  • 立方晶Ce<sub>6</sub>Ni<sub>6</sub>P<sub>17</sub>の基底状態のNMRによる研究

    小山岳秀, 岩崎聡, 山田陽彦, 上田光一, 水戸毅, 青山悠司, 中野智仁, 武田直也

    日本物理学会講演概要集(CD-ROM)   70 ( 2 )   2015

  • 22aPS-94 Low temperature measurements of the anti-ferromagnetic compound SmT_2Zn_<20> (T=Rh, Ir)

    Tanahashi M., Adachi K., Sasahara T., Kase N., Nakano T., Takeda N., Kono Y., Sakakibara T.

    Meeting Abstracts of the Physical Society of Japan   70 ( 0 )   2184 - 2184   2015

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    DOI: 10.11316/jpsgaiyo.70.1.0_2184

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  • 17aPS-64 Field-induced first-order transitions in caged compounds SmTr_2Zn_<20>(Tr = Rh, Ir)

    Tanahashi M., Adachi K., Sasahara T., Kase N., Nakano T., Takeda N.

    Meeting Abstracts of the Physical Society of Japan   70 ( 0 )   1858 - 1858   2015

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  • 立方晶Ce<sub>6</sub>Ni<sub>6</sub>P<sub>17</sub>の<sup>31</sup>P-NMR

    小山岳秀, 山田陽彦, 上田光一, 水戸毅, 小原孝夫, 青山悠司, 中野智仁, 武田直也

    日本物理学会講演概要集   69 ( 1 )   2014

  • 正方晶CaBe<sub>2</sub>Ge<sub>2</sub>型構造を有する新超伝導体の探索

    加瀬直樹, 塚本壮紀, 中野智仁, 武田直也

    日本物理学会講演概要集   69 ( 2 )   2014

  • カゴ状構造を有するSc<sub>5</sub>Tr<sub>6</sub>Sn<sub>18</sub>(Tr=Co,Rh,Ir)の超伝導特性

    加瀬直樹, 照井祐輔, 中野智仁, 武田直也, 橘高俊一郎, 榊原俊郎, 秋光純

    日本物理学会講演概要集   69 ( 2 )   2014

  • SmT<sub>2</sub>Zn<sub>20</sub>(T=Ir,Os)の単結晶育成と低温物性

    安達季並, 棚橋正貴, 笹原拓也, 加瀬直樹, 中野智仁, 武田直也

    日本物理学会講演概要集   69 ( 2 )   2014

  • CePt(Si,Ge)<sub>2</sub>の圧力効果

    大屋七海, 小貫真太郎, 加瀬直樹, 中野智仁, 武田直也, 松林和幸, 上床美也

    日本物理学会講演概要集   69 ( 2 )   2014

  • Introduction to Engineering Literacy in Department of Materials Science and Technology

    TAKEDA Naoya, NAKANO Tomohito, ANADA Taishi

    25 ( 61 )   716 - 717   2013.8

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  • 正八面体フラストレート系Ce<sub>6</sub>Ni<sub>6</sub>P<sub>17</sub>のLa希釈効果

    青山悠司, 武田大地, 加瀬直樹, 中野智仁, 武田直也

    日本物理学会講演概要集   68 ( 2 )   2013

  • R<sub>3</sub>Pt<sub>23</sub>X<sub>11</sub>(R=La,Ce,X=Si,Ge)の低温物性

    武田大地, 佐藤凌, 加瀬直樹, 中野智仁, 武田直也

    日本物理学会講演概要集   68 ( 2 )   2013

  • LaOs<sub>4</sub>P<sub>12</sub>のRu置換効果の研究

    福崎翔晴, 黒瀧直也, 星徳仁, 武田遼太郎, 加瀬直樹, 中野智仁, 武田直也

    日本物理学会講演概要集   68 ( 2 )   2013

  • 層状化合物CePt<sub>2</sub>In<sub>7</sub>の圧力誘起超伝導

    武田直也, 大泉智聖, 佐藤亮平, 中野智仁

    高圧討論会講演要旨集   54th   2013

  • CePt(Si<sub>x</sub>Ge<sub>1-x</sub>)<sub>2</sub>の圧力下電気抵抗

    大屋七海, 小貫真太郎, 加瀬直樹, 中野智仁, 武田直也

    高圧討論会講演要旨集   54th   2013

  • 層状化合物RPt<sub>2</sub>In<sub>7</sub>単結晶の育成と低温物性

    大泉智聖, 丹保七海, 古田沙紀子, 中野智仁, 武田直也

    日本物理学会講演概要集   68 ( 1 )   2013

  • 立方晶RRh<sub>2</sub>Zn<sub>20</sub>(R=Sm,Tm)の低温物性

    笹原拓也, 中野智仁, 武田直也

    日本物理学会講演概要集   68 ( 1 )   2013

  • 超伝導体R<sub>5</sub>T<sub>6</sub>Sn<sub>18</sub>(R=Y,Lu,T=Co,Ir)の低温物性

    穴田泰士, 中野智仁, 武田直也

    日本物理学会講演概要集   68 ( 1 )   2013

  • La<sub>1-x</sub>Ce<sub>x</sub>Os<sub>4</sub>P<sub>12</sub>の磁性と伝導 II

    淀野晋, 大滝周, 武田遼太郎, 黒瀧直哉, 中野智仁, 武田直也

    日本物理学会講演概要集   68 ( 1 )   2013

  • 重い電子系化合物CePt<sub>2</sub>In<sub>7</sub>の圧力下In-NQR

    八島光晴, 椋田秀和, 北岡良雄, 大泉智聖, 中野智仁, 武田直也

    日本物理学会講演概要集   68 ( 2 )   2013

  • 層状化合物RPt<sub>2</sub>In<sub>7</sub>の置換効果

    金子美翔, 大泉智聖, 丹保七海, 古田沙紀子, 加瀬直樹, 中野智仁, 武田直也

    日本物理学会講演概要集   68 ( 2 )   2013

  • Yb<sub>2</sub>Ni<sub>12</sub>P<sub>7</sub>の圧力効果 III

    佐藤亮平, 土屋勝彦, 中野智仁, 武田直也, 大橋政司, 巨海玄道, 松林和幸, 上床美也

    日本物理学会講演概要集   68 ( 2 )   2013

  • 20aPSA-32 NQR study on CeRu_4X_<12> (X = As, Sb)

    Yogi M., Niki H., Sekine C., Sugawara H., Takeda N., Sato H.

    Meeting abstracts of the Physical Society of Japan   67 ( 2 )   514 - 514   2012.8

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  • CePt<sub>2</sub>In<sub>7</sub>の単結晶育成の試みと低温物性

    大泉智聖, 佐藤亮平, 中野智仁, 武田直也

    日本物理学会講演概要集   67 ( 1 )   2012

  • カゴ状物質R<sub>5</sub>Co<sub>6</sub>Sn<sub>18</sub>(R=Tb,Ho,Er,Tm,Lu)の低温物性

    穴田泰士, 大泉智聖, 笹原拓也, 佐藤亮平, 淀野晋, 小野宏基, 中野智仁, 武田直也

    日本物理学会講演概要集   67 ( 1 )   2012

  • 超伝導体LaOs<sub>4</sub>P<sub>12</sub>の磁性不純物効果 II

    淀野晋, 武田遼太郎, 佐藤亮平, 黒瀧直哉, 星徳仁, 小野宏基, 中野智仁, 武田直也

    日本物理学会講演概要集   67 ( 1 )   2012

  • LaOs<sub>4</sub>P<sub>12</sub>の圧力効果

    佐藤亮平, 星徳仁, 黒瀧直哉, 武田遼太郎, 淀野晋, 中野智仁, 武田直也

    日本物理学会講演概要集   67 ( 1 )   2012

  • CePtSi<sub>2</sub>単結晶の圧力効果 II

    中野智仁, 小貫真太郎, 佐藤亮平, 笹原拓也, 武田直也, 松林和幸, 上床美也

    日本物理学会講演概要集   67 ( 1 )   2012

  • 六方晶Yb<sub>2</sub>Ni<sub>12</sub>P<sub>7</sub>の<sup>31</sup>P-NMR

    小山岳秀, 杉浦恭平, 上田光一, 水戸毅, 小原孝夫, 中野智仁, 土屋勝彦, 佐藤亮平, 武田直也

    日本物理学会講演概要集   67 ( 2 )   2012

  • 圧力誘起超伝導体CePt<sub>2</sub>In<sub>7</sub>単結晶の低温物性

    大泉智聖, 笹原拓也, 佐藤亮平, 中野智仁, 武田直也

    日本物理学会講演概要集   67 ( 2 )   2012

  • 強磁性体SmRu<sub>2</sub>Zn<sub>20</sub>の圧力効果

    笹原拓也, 大泉智聖, 佐藤亮平, 中野智仁, 武田直也, 塩尻泰広, 雨海有佑, 村山茂幸

    日本物理学会講演概要集   67 ( 2 )   2012

  • R(Os<sub>x</sub>Ru<sub>1-x</sub>)<sub>4</sub>P<sub>12</sub>の磁性と伝導

    淀野晋, 武田遼太郎, 黒瀧直哉, 星徳仁, 中野智仁, 武田直也

    日本物理学会講演概要集   67 ( 2 )   2012

  • カゴ状物質R<sub>5</sub>T<sub>6</sub>Sn<sub>18</sub>(R=Y,Lu,T=Co,Ir)の超伝導

    穴田泰士, 中野智仁, 武田直也

    日本物理学会講演概要集   67 ( 2 )   2012

  • 幾何学的フラストレート系Ce<sub>6</sub>Ni<sub>6</sub>P<sub>17</sub>の残留エントロピー

    武田直也, 泉健之亮, 小野宏基, 淀野晋, 中野智仁

    日本物理学会講演概要集   67 ( 1 )   2012

  • RRu<sub>2</sub>Zn<sub>20</sub>(R=Sm,Tm)の低温物性

    笹原拓也, 小野宏基, 中野智仁, 武田直也

    日本物理学会講演概要集   67 ( 1 )   2012

  • 24pGC-8 Specific heat in magnetic fields of R_3Pd_<20>Si_6 single crystal III

    Ono H., Nakano T., Takeda N., Ano G., Akatsu M., Nemoto Y., Goto T., Kitazawa H.

    Meeting abstracts of the Physical Society of Japan   66 ( 2 )   650 - 650   2011.8

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  • CePtSi<sub>2</sub>単結晶の圧力下輸送特性

    中野智仁, 武田直也, 小貫真太郎, 佐藤亮平

    高圧討論会講演要旨集   52nd   2011

  • 六方晶Yb<sub>2</sub>Ni<sub>12</sub>P<sub>7</sub>の圧力効果

    中野智仁, 佐藤亮平, 土屋勝彦, 武田直也

    日本物理学会講演概要集   66 ( 1 )   2011

  • 超伝導体La<sub>1-x</sub>R<sub>x</sub>Os<sub>4</sub>P<sub>12</sub>(R:希土類元素)の磁性不純物効果

    黒瀧直哉, 星徳仁, 小野宏基, 立松賢治, 中野智仁, 武田直也

    日本物理学会講演概要集   66 ( 1 )   2011

  • カゴ状物質R<sub>5</sub>Co<sub>6</sub>Sn<sub>18</sub>(R=Tb,Ho,Er,Tm,Lu)の低温磁気的性質

    穴田泰士, 小野宏基, 中野智仁, 武田直也

    日本物理学会講演概要集   66 ( 2 )   2011

  • CePtSi<sub>2</sub>単結晶の輸送特性

    小貫真太郎, 中野智仁, 武田直也

    日本物理学会講演概要集   66 ( 2 )   2011

  • カゴ状物質Mn<sub>3</sub>Pd<sub>20</sub>P<sub>6</sub>の低温物性

    時吉信太郎, 荒井祥伍, 中野智仁, 武田直也

    日本物理学会講演概要集   66 ( 2 )   2011

  • TmCo<sub>2</sub>Zn<sub>20</sub>の低温物性

    笹原拓也, 小野宏基, 中野智仁, 武田直也

    日本物理学会講演概要集   66 ( 2 )   2011

  • カゴ状物質Mn<sub>3</sub>Ni<sub>20</sub>P<sub>6</sub>の磁気的性質

    荒井祥伍, 時吉信太郎, 中野智仁, 武田直也

    日本物理学会講演概要集   66 ( 2 )   2011

  • Yb<sub>2</sub>Ni<sub>12</sub>P<sub>7</sub>の圧力効果 II

    佐藤亮平, 中野智仁, 土屋勝彦, 武田直也

    日本物理学会講演概要集   66 ( 2 )   2011

  • 超伝導体LaOs<sub>4</sub>P<sub>12</sub>の磁性不純物効果

    武田遼太郎, 淀野晋, 黒瀧直哉, 星徳仁, 小野宏基, 中野智仁, 武田直也

    日本物理学会講演概要集   66 ( 2 )   2011

  • 六方晶R<sub>2</sub>Ni<sub>12</sub>P<sub>7</sub>(R=Rare Earth)の低温物性(III)

    中野智仁, 土屋勝彦, 大橋淳美, 梨本貴史, 武田直也

    日本物理学会講演概要集   66 ( 2 )   2011

  • CePtSi<sub>2</sub>単結晶の圧力効果

    中野智仁, 小貫真太郎, 武田直也

    日本物理学会講演概要集   66 ( 2 )   2011

  • LaOs<sub>4</sub>P<sub>12</sub>の圧力効果

    武田直也, 中野智仁, 佐藤亮平, 淀野晋, 武田遼太郎

    高圧討論会講演要旨集   52nd   2011

  • 21aPS-76 Study of Electric Quadrupolar Effects in Nd_3Pd_<20>Si_6 using Ultrasonic Measurements IV

    Tachikawa Y., Ano G., Matsuo K., Akatsu M., Nemoto Y., Goto T., Takeda N., Kikkawa A., Donni Andress, Kitazawa H.

    Meeting abstracts of the Physical Society of Japan   65 ( 1 )   618 - 618   2010.3

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  • 21pGD-8 Ultrasonic Investigation of Quadrupole Ordering in Pr_3Pd_<20>Ge_6

    Ano G., Matsuo K., Araki K., Tachikawa Y., Akatsu M., Nemoto Y., Goto T., Takeda N., Kikkawa A., Donni Andreas, Kitazawa H.

    Meeting abstracts of the Physical Society of Japan   65 ( 1 )   625 - 625   2010.3

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  • 20aGD-11 Low Temperature Properties of Tm_2Rh_<12>P_7

    Tatematsu K, Nakano T, Takeda N, Nishimori M, Hasegawa H, Sasaki S

    Meeting Abstracts of the Physical Society of Japan   65 ( 0 )   528 - 528   2010

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  • 超伝導体(La<sub>1-x</sub>R<sub>x</sub>)Os<sub>4</sub>P<sub>12</sub>(R:Rare Earth)の異常比熱

    黒瀧直哉, 星徳仁, 小野宏基, 立松賢治, 中野智仁, 武田直也

    日本物理学会講演概要集   65 ( 2 )   2010

  • 充填型化合物R<sub>2</sub>Ni<sub>12</sub>P<sub>7</sub>の低温物性

    土屋勝彦, 大橋淳美, 梨本貴史, 小野宏基, 立松賢治, 中野智仁, 武田直也

    日本物理学会講演概要集   65 ( 1 )   2010

  • Ce化合物の物質探索とその物性

    中野智仁, 武田遼太郎, 武田直也

    日本物理学会講演概要集   65 ( 2 )   2010

  • 圧力誘起超伝導体CePtSi<sub>2</sub>の試料純良化

    中野智仁, 小貫真太郎, 武田直也

    日本物理学会講演概要集   65 ( 1 )   2010

  • 非充填スクッテルダイト化合物NiP<sub>3</sub>の磁性と伝導

    中條敏宏, 小野宏基, 立松賢治, 中野智仁, 武田直也, 佐藤麻衣子, 原田修治

    日本物理学会講演概要集   65 ( 1 )   2010

  • Tm<sub>2</sub>Rh<sub>12</sub>P<sub>7</sub>の低温物性

    立松賢治, 中野智仁, 武田直也, 西森将志, 長谷川広和, 佐々木進, 佐々木進

    日本物理学会講演概要集   65 ( 1 )   2010

  • 26aRL-11 Ultrasonic Measurement of Ratting in Pr_<1-x>Nd_xOs_4Sb_<12>

    Yanagisawa T, Saito H, Mayama T, Ikeda Y, Hidaka H, Amitsuka H, Nemoto Y, Goto T, Takeda N, Ho P. -C, Maple M. B

    Meeting abstracts of the Physical Society of Japan   64 ( 2 )   475 - 475   2009.8

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  • 26aRL-10 Ratting and Tunneling in The Filled Skutterudite (Pr_<1-x>La_x)Os_4Sb_<12>

    Nemoto Y., Toyada T., Ano G., Araki K., Akatsu M., Ishii I., Takeda N., Ochiai A., Sugawara H., Sato H., Goto T.

    Meeting abstracts of the Physical Society of Japan   64 ( 2 )   475 - 475   2009.8

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  • 25aPS-71 Ultrasonic Investigation of Quadropole Effect in Pr_3Pd_<20>Ge_6

    Ano G., Matsuo K., Tachikawa Y., Akatsu M., Nemoto Y., Goto T., Takeda N., Kikkawa A., Donni Andress, Kitazawa H.

    Meeting abstracts of the Physical Society of Japan   64 ( 2 )   432 - 432   2009.8

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  • 25aPS-73 Synthesis Condition and Magnetic Properties of Rare Earth Chalcogenides RR'S_3(R=Pr, Nd ; R'=Lu)

    Kuwahara T., Ono H., Tatematsu K., Takeda n.

    Meeting abstracts of the Physical Society of Japan   64 ( 2 )   433 - 433   2009.8

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  • 充填スクッテルダイト化合物(Pr<sub>1‐x</sub>La<sub>x</sub>)Os<sub>4</sub>Sb<sub>12</sub>のラットリングと超伝導

    山口高央, 後藤沙織, 石井勲, 赤津光洋, 根本祐一, 後藤輝孝, 武田直也, 柳澤達也

    日本物理学会講演概要集   64 ( 1 )   532   2009.3

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  • 27aPS-3 Rattling and Superconductivity in the Filled Skutterudite (Pr_<1-x>La_x)Os_4Sb_<12>

    Yamaguchi A, Goto S, Ishii I, Akatsu M, Nemoto Y, Goto T, Takeda N, Yanagisawa T

    Meeting abstracts of the Physical Society of Japan   64 ( 1 )   532 - 532   2009.3

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  • 29pTA-10 NMR of (Tm_XLu_<x-1>)_2Rh_<12>P_7

    Tatematsu K., Takeda N., Kudou M., Nishimori M., Sasaki S.

    Meeting abstracts of the Physical Society of Japan   64 ( 1 )   629 - 629   2009.3

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  • 27pTL-4 Specific Heat of RYbQ_3 Chalcogenides, R=La, Ce Q=S, Se

    Ono H., Kuwahara T., Tatematsu K., Takeda N.

    Meeting abstracts of the Physical Society of Japan   64 ( 1 )   562 - 562   2009.3

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  • 27aPS-12 Quadrupolar Ordering and Phase Diagram in Rare-Earth Clathrate Compound Pr_3Pd_<20>Si_6

    Tsuduku S., Ano G., Tachikawa Y., Ishii I., Akatsu M., Nemoto Y., Goto T., Takeda N., Donni Andreas, Kitazawa H.

    Meeting abstracts of the Physical Society of Japan   64 ( 1 )   534 - 534   2009.3

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  • 21aPS-13 Investigation of Rattling in The Filled Skutterudite (Pr_<1-x>La_x)Os_4Sb_<12>

    Yamaguchi A, Goto S, Ishii I, Akatsu M, Nemoto Y, Goto T, Takeda N, Yanagisawa T

    Meeting abstracts of the Physical Society of Japan   63 ( 2 )   496 - 496   2008.8

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    DOI: 10.1143/JPSJ.77.074607

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  • 21aPS-11 Ultrasonic Dispersion in the Filled-Skutterudite Pr_<0.55>Nd<0.45>Os_4Sb_<12>

    Yanagisawa T, Mayama T, Morishita A, Hidaka H, Amitsuka H, Yamaguchi A, Nemoto Y, Goto T, Takeda N, Ho Pei-Chun, Maple M. Brian

    Meeting abstracts of the Physical Society of Japan   63 ( 2 )   495 - 495   2008.8

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  • 22pQC-13 Specific Heat of RR'Q_3 Chalcogenides, Q=S, Se

    Ono H., Kuwahara T., Tatematsu K., Takeda N.

    Meeting abstracts of the Physical Society of Japan   63 ( 2 )   556 - 556   2008.8

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  • 23aQA-10 Specific Heat of (Tm_xLu_<x-1>)_2Rh_<12>P_7 in magnetic field

    Tatematsu K., Takeda N.

    Meeting abstracts of the Physical Society of Japan   63 ( 2 )   566 - 566   2008.8

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  • 21aPS-6 Sb-NMR/NQR study on CeTx_4Sb_<12> II

    Yogi M., Niki H., Mukuda H., Kitaoka Y., Sugawara H., Sato H., Takeda N.

    Meeting abstracts of the Physical Society of Japan   63 ( 2 )   494 - 494   2008.8

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  • 23pPSB-15 Ultrasonic Investigation of Quadrupole Effect in Clathrate Compound Ce_3Pd_<20>Si_6

    Tsuduku S, Kobayashi H, Tachikawa Y, Suzuki O, Yanagisawa T, Nemoto Y, Goto T, Takeda N, Donni Andress, Kitazawa H

    Meeting abstracts of the Physical Society of Japan   63 ( 1 )   549 - 549   2008.2

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  • 超音波測定によるCe<sub>3</sub>Pd<sub>20</sub>Si<sub>6</sub>の四極子秩序の研究

    後藤輝孝, 小林陽樹, 都竹星志, 渡辺智行, 鈴木修, 柳沢達也, 根本祐一, 武田直也, DOENNI Andreas, 北澤英明

    日本物理学会講演概要集   63 ( 1 )   527   2008.2

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  • 23pWR-8 Ultrasonic Investigation of Electric Quadrupole Effect in Pr_3Pd_<20>Si_6

    Kobayashi H, Tsuduku S, Suzuki O, Yanagisawa T, Nemoto Y, Goto T, Takeda N, Donni Andreas, Kitazawa H

    Meeting abstracts of the Physical Society of Japan   63 ( 1 )   528 - 528   2008.2

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  • 23pWR-7 Ultrasonic Investigation of Quadrupole Ordering in Ce_3Pd_<20>Si_6

    Goto T, Kobayashi H, Tsuduku S, Watanabe T, Suzuki O, Yanagisawa T, Nemoto Y, Takeda N, Donni Andreas

    Meeting abstracts of the Physical Society of Japan   63 ( 1 )   527 - 527   2008.2

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  • 23pPSB-16 Study of Electric Quadrupolar Effects in Nd_3Pd_<20>Si_6

    Tachikawa Y, Kobayashi H, Tsuduku S, Ano G, Yanagisawa T, Nemoto Y, Goto T, Takeda N, Donni Andreas, Kitazawa H

    Meeting abstracts of the Physical Society of Japan   63 ( 1 )   549 - 549   2008.2

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  • 23pPSA-19 Specific heat of LaOs_4P_<12>

    Hoshi N., Tatematsu K., Takeda N.

    Meeting abstracts of the Physical Society of Japan   63 ( 1 )   539 - 539   2008.2

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  • 23pPSB-33 Syntheses, Structure, and Magnetic properties of RR'Q_3 Chalcogenides, Q=S,Se,Te

    Furui T., Ono H., Tatematsu K., Takeda N.

    Meeting abstracts of the Physical Society of Japan   63 ( 1 )   553 - 553   2008.2

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  • 24aWR-11 Specific Heat of (Tm_xLu_<x-1>)_2Rh_<12>P_7

    Tatematsu K., Takeda N.

    Meeting abstracts of the Physical Society of Japan   63 ( 1 )   567 - 567   2008.2

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  • 21aXA-10 Rattling and Tunneling in Filled-skutterudite Compounds

    Nemoto Y, Yasumoto Y, Yamaguchi A, Yanagisawa T, Goto T, Takeda N, Ochiai A, Sugawara H, Sato H

    Meeting abstracts of the Physical Society of Japan   62 ( 2 )   515 - 515   2007.8

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  • 21pPSB-30 Superconductivity in filled'type compounds

    Hoshi N., Nashimoto T., Tatematsu K., Takeda N.

    Meeting abstracts of the Physical Society of Japan   62 ( 2 )   579 - 579   2007.8

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  • 21pPSA-4 Syntheses, Structure, and Magnetic properties of 'RR'Q_3 Chalcogenides, Q=S, Se, Te

    Furui T., Ono H., Tatematsu K., Takeda N.

    Meeting abstracts of the Physical Society of Japan   62 ( 2 )   561 - 561   2007.8

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  • 21pPSB-32 Composition and low-temp properties of RE_2Rh_<12>P_7(RE=Ce, Dy, Yb)

    Fujii K., Tatematsu K., Takeda N.

    Meeting abstracts of the Physical Society of Japan   62 ( 2 )   579 - 579   2007.8

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  • 21pPSA-71 Ultrasonic Study of Electric Quadrupolar Effect in Clathrate Compounds R_3Pd_<20>Si_6 (R = Ce, Pr)

    Kobayashi H., Tsuduku S., Suzuki O., Nemoto Y., Goto T., Takeda N., Donni Andreas, Kitazawa H.

    Meeting abstracts of the Physical Society of Japan   62 ( 2 )   565 - 565   2007.8

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  • 18pPSA-45 Rattling and quantum effect of the Filled Skutterudite Pr(Os_<1-x>Ru_x)_4Sb_<12> and ROs_4Sb_<12>(R=La,Nd) by using Ultrasonic Measurements

    Watanabe H, Nemoto Y, Takeda N, Yanagisawa T, Goto T, Ochiai A, Yoshino K, Sugawara H, Sato H

    Meeting abstracts of the Physical Society of Japan   62 ( 1 )   523 - 523   2007.2

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  • 21aXA-12 Heavy Fermion State of Tm_2Rh_<12>P_7

    Tatematsu K., Takabatake T., Yamada Y., Hukuda K., Takeda N., Araki Y., Nisioka T., Kodama K., Shimizu K., Matsushita T., Wada N., Narazu S.

    Meeting Abstracts of the Physical Society of Japan   62   516 - 516   2007

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    DOI: 10.11316/jpsgaiyo.62.2.3.0_516_1

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  • 23pPSA-8 Rattling of the filled skutterudite compound Pr(Os_<1-x>Ru_x)_4Sb_<12> and LaOs_4Sb_<12> by ultrasonic measurements

    Watanabe H, Nemoto Y, Takeda N, Yanagisawa T, Goto T, Ochiai A, Yoshino K, Sugawara H, Sato H

    Meeting abstracts of the Physical Society of Japan   61 ( 2 )   408 - 408   2006.8

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  • 23pPSA-16 NMR study of the filled skutterudite compounds RRu_4P_<12> (R=La, Nd, Sm)

    Masaki S., Mito T., Wada S., Kikuchi D., Sato H., Sugawara H., Takeda N., Zheng G.-q.

    Meeting abstracts of the Physical Society of Japan   61 ( 2 )   409 - 409   2006.8

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  • 28pPSA-17 Crystalline Electric Fields and rattling of the filled skutterudite compound Pr(Os_<1-x>Ru_x)_4Sb_<12> by ultrasonic measurements

    Watanabe H, Ueno T, Nemoto Y, Takeda N, Yanagisawa T, Goto T, Sugawara H, Sato H

    Meeting abstracts of the Physical Society of Japan   61 ( 1 )   601 - 601   2006.3

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  • 28aUF-9 Magneto-acoustic birefringence of filled skutterudite PrOs_4Sb_<12> with T_h symmetry

    Ueno T, Nemoto Y, Takeda N, Yanagisawa T, Goto T, Sugawara H, Sato H

    Meeting abstracts of the Physical Society of Japan   61 ( 1 )   578 - 578   2006.3

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    DOI: 10.1143/JPSJ.75.064711

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  • 28pPSA-52 Crystalline-field Effect in Clathrate Compounds Ce_3Pd_<20>Si_6 by Ultrasonic Measurements

    Watanabe T., Yamaguchi T., Nemoto Y., Goto T., Takeda N., Suzuki O., Kitazawa H.

    Meeting abstracts of the Physical Society of Japan   61 ( 1 )   610 - 610   2006.3

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  • 25pYA-8 Anomalous Physical Properties of New Filled-Type Compound Tm_2Rh_<12>P_7

    Tatematsu K., Hukuda K., Takeda N., Yamada Y., Shimizu K., Matsushita T., Wada N., Narazu S., Takabatake T.

    Meeting Abstracts of the Physical Society of Japan   61   499 - 499   2006

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    DOI: 10.11316/jpsgaiyo.61.2.3.0_499_1

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  • 28pPSA-23 Synthesis of New Filled-Type Compound

    Tatematsu K., Wada N., Kobayashi Y., Takizawa T., Fujii K., Takeda N., Araki Y., Nishioka T., Komada K., Shimizu K.

    Meeting Abstracts of the Physical Society of Japan   61   603 - 603   2006

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    DOI: 10.11316/jpsgaiyo.61.1.3.0_603_2

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  • 19aYG-9 Ultrasonic Dispersion and Rattling in Heavy Fermion Superconductor PrOs_4Sb_<12> and the diluted system Pr(Os_<1-x>Ru_x)_4Sb_<12>

    Nemoto Y, Ueno T, Takeda N, Yanagisawa T, Goto T, Sugawara H, Sato H

    Meeting abstracts of the Physical Society of Japan   60 ( 2 )   362 - 362   2005.8

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  • 19pPSA-17 Quadrupole effect and rattling of the filled skutterudite compound Pr(Os_<1-X>Ru_X)_4Sb_<12> by ultrasonic measurements

    Ueno T, Nemoto Y, Takeda N, Yanagisawa T, Goto T, Sugawara H, Sato H

    Meeting abstracts of the Physical Society of Japan   60 ( 2 )   397 - 397   2005.8

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  • 26pYS-1 Rattling and tunneling in clathrate compounds

    Goto T, Yamaguchi T, Nemoto Y, Ueno T, Yanagisawa T, Takeda N, Suzuki O, Kitazawa H, Sugawara H, Satoh H

    Meeting abstracts of the Physical Society of Japan   60 ( 1 )   925 - 925   2005.3

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  • 25pTA-8 Ultrasonic Attenuation and Rattling in Heavy Fermion Superconductor PrOs_4Sb_<12>

    Nemoto Y, Ueno T, Yamaguchi T, Yanagisawa T, Goto T, Takeda N, Sugawara H, Satoh H

    Meeting abstracts of the Physical Society of Japan   60 ( 1 )   550 - 550   2005.3

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    DOI: 10.1143/JPSJ.74.263

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  • 25aPS-35 NMR studies on a Sm-baced filled-skutterudite

    Oki N., Mito T., Noguchi S., Masaki S., Wada S., Takeda N., Ishikawa M.

    Meeting abstracts of the Physical Society of Japan   60 ( 1 )   530 - 530   2005.3

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  • 14pPSA-68 ^<31>P-NMR Measurement of Filled Skutterdite Compound SmRu_4P_12

    Masaki S, Mito T., Oki N., Wada S., Takeda N., Ishikawa M.

    Meeting abstracts of the Physical Society of Japan   59 ( 2 )   560 - 560   2004.8

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  • 13pRD-8 Comments on anomalous magnetism and superconductivity of CePt_3Si

    Ishikawa M., Takeda N.

    Meeting abstracts of the Physical Society of Japan   59 ( 2 )   501 - 501   2004.8

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  • 29pXD-8 Effects of Ge/B substitution in the heavy-electron superconductor CePt_3Si

    Ishikawa M., Takeda N.

    Meeting abstracts of the Physical Society of Japan   59 ( 1 )   628 - 628   2004.3

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  • Quadrupole Susceptibility and Crystalline Electric Field in PrRu_4Sb_<12>

    Onuki K., Sakai K., Nemoto Y., Goto T., Takeda N., Ishikawa M.

    Meeting abstracts of the Physical Society of Japan   58 ( 2 )   457 - 457   2003.8

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  • 31P-NMR study of SmFe4P12

    Noguchi S., Koyama T., Mito T., Wada S., Takeda N., Ishikawa M.

    Meeting abstracts of the Physical Society of Japan   57 ( 2 )   436 - 436   2002.8

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  • Superconductivity of new filled skutterudite compound YFe4P12

    Shirotani I., Shimaya Y., Kihou K., Sekine C., Takeda N., Ishikawa M., Yagi T.

    Meeting abstracts of the Physical Society of Japan   57 ( 2 )   436 - 436   2002.8

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  • Magnetic properties of Y_3Rh_2Si_2-Type Compounds.

    Takeda N., Ishikawa M.

    Meeting abstracts of the Physical Society of Japan   56 ( 1 )   499 - 499   2001.3

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  • Pressure Effect on Transport Properties and Specific Heat of Kondo Compound Ce 3 Pd 20 Si 6 Reviewed

    Tsuyoshi Hashiguchi, Naoya Takeda, Jiro Kitagawa, Nobuo Wada, Shigeru Takayanagi, Masayasu Ishikawa, Nobuo Mōri

    J. Phys. Soc. Jpn.   69 ( 3 )   667 - 670   2000.3

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    Publisher:Physical Society of Japan  

    DOI: 10.1143/jpsj.69.667

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  • Quadrupolar pair interactions in RPd<inf>3</inf> S<inf>4</inf> (R = rare earths) Reviewed

    Abe, K., Kitagawa, J., Takeda, N., Ishikawa, M.

    Physica B: Condensed Matter   281-282   597   2000

  • 25aJ-7 Effects of Orbital Degeneracies in Rare-earth Palladium Bronzes RPd_3S_4

    Ishikawa M, Abe K, Kitagawa J, Takeda N

    Meeting abstracts of the Physical Society of Japan   54 ( 2 )   491 - 491   1999.9

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  • 25pPSA-45 Crystalline-electric-field Effect and the Third-order Magnetic Susceptibility of Ce_3Pd_<20>Ge_6

    Kitagawa J, Takeda N, Ishikawa M, Yoshida T, Ishiguro A, Kimura N, Komatsubara T

    Meeting abstracts of the Physical Society of Japan   54 ( 2 )   532 - 532   1999.9

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  • 25pPSA-58 Magnetic and Quadrupolar Orderings in Rare-earth Palladium Bronzes RPd_3S_4

    Kitagawa J, Abe K, Takeda N, Ishikawa M

    Meeting abstracts of the Physical Society of Japan   54 ( 2 )   535 - 535   1999.9

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  • 28a-D-10 Magnetic Properties of Filled Skutterdite Type Compounds

    Takeda N., Ishikawa M.

    Meeting abstracts of the Physical Society of Japan   54 ( 1 )   371 - 371   1999.3

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  • 31a-H-5 Sample dependence of (RE)_3Pd_20Ge_6(RE=Ce and Nd)

    Kitagawa J., Takeda N., Ishikawa M.

    Meeting abstracts of the Physical Society of Japan   54 ( 1 )   488 - 488   1999.3

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  • Low temperature physical properties of compounds crystallizing into a structure of C_6Cr_<23> type

    KITAGAWA J., TAKEDA N., ISHIKAWA M.

    Meeting abstracts of the Physical Society of Japan   53 ( 2 )   458 - 458   1998.9

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  • Anisotropic magnetic phase diagram of the Kondo-lattice compound Ce3Pd20Ge6: Observation of antiferromagnetic and quadrupolar ordering

    KITAGAWA J, TAKEDA N, ISHIKAWA M, YOSHIDA T, ISHIGURO A, KIMURA N, KOMATSUBARA T

    Phys. Rev. B   57 ( 13 )   7450 - 7453   1998

  • 6a-YK-8 Magnetic and Superconducting Properties of RERu_4Sb_<12>(RE=La, Ce, Pr)

    Takeda N., Ishikawa M.

    Meeting abstracts of the Physical Society of Japan   52 ( 2 )   473 - 473   1997.9

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  • 5a-YG-5 Specific Heat of Ce_3Pd_<20>Ge_6 in Magnetic Field III

    Kitagawa J., Takeda N., Ishikawa M., Yoshida T., Ishiguro A., Sato N., Komatsubara T.

    Meeting abstracts of the Physical Society of Japan   52 ( 2 )   425 - 425   1997.9

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  • 31p-P-7 Specific Heat of Ce_3Pd_<20>Ge_6 in Magnetic Field II

    Kitagawa J., Takeda N., Ishikawa M., Yoshida T., Ishiguro A., Sato N., Komatsubara T.

    Meeting abstracts of the Physical Society of Japan   52 ( 1 )   515 - 515   1997.3

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  • 28p-PSB-38 Physical properties from the antiferromagnetic to the valence fluctuation state in the solid solution CeCoGe_<3-x>Si_x system

    Eom D.H., Kitagawa J., Takeda N., Ishikawa M.

    Meeting abstracts of the Physical Society of Japan   52 ( 1 )   465 - 465   1997.3

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  • 28p-PSB-37 Low temperature physical properties of BaNiSn_3-type Ce intermetallic compounds

    Muro Yuji, Takeda Naoya, Ishikawa Masayasu

    Meeting abstracts of the Physical Society of Japan   52 ( 1 )   465 - 465   1997.3

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  • Low-temperature magnetic properties of (RE)<inf>3</inf>Pd<inf>20</inf>Si<inf>6</inf> (RE=La to Yb) Reviewed

    Kitagawa, J., Takeda, N., Ishikawa, M.

    Journal of Alloys and Compounds   256 ( 1-2 )   48 - 56   1997

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  • Low-temperature specific heat of Ce<inf>3-x</inf>La<inf>x</inf>Pd<inf>20</inf>Si<inf>6</inf> Reviewed

    Takeda, N., Kitagawa, J., Ishikawa, M.

    Physica B: Condensed Matter   230-232   145 - 147   1997

  • Magnetic properties of CeTSb_2(T=Ni, Cu, Pd, Ag)

    Muro Y., Takeda N., Ishikawa M.

    Abstracts of the meeting of the Physical Society of Japan. Sectional meeting   1996 ( 3 )   154 - 154   1996.9

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  • 1a-YC-11 Magnetic and Transport Properties of La_<3-x>Ce_xPd_<20>Si_6 II

    Takeda N., Kitagawa J., Ishikawa M.

    Abstracts of the meeting of the Physical Society of Japan. Annual meeting   51 ( 3 )   61 - 61   1996.3

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  • Low temperature physical properties of Ce_3Pd_<20>Ge_6

    Kitagawa J., Takeda N., Ishikawa M.

    Abstracts of the meeting of the Physical Society of Japan. Sectional meeting   1995 ( 3 )   1 - 1   1995.9

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  • Low temperature physical properties of RE_3Pd_<20>Si_6

    Kitagawa J., Takeda N., Ishikawa M.

    Abstracts of the meeting of the Physical Society of Japan. Annual meeting   50 ( 3 )   153 - 153   1995.3

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  • 5a-Z-9 Low temperature physical properties of CePd_<3.8>Al_<7.2>

    Kitagawa J, Takeda N, Ishikawa M

    Abstracts of the meeting of the Physical Society of Japan. Sectional meeting   1994 ( 3 )   158 - 158   1994.8

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  • 28a-PS-23 Matcrial research on Ce-Pd-Al ternary system

    Kitagawa J, Takeda N, Sawa H, Ishikawa M

    Abstracts of the meeting of the Physical Society of Japan. Annual meeting   49 ( 3 )   30 - 30   1994.3

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Presentations

  • Fundamental properties of a new samarium compound SmPtSi2 International conference

    S.Yamaguchi 他

    Strongly Correlated Electron Systems2017  2017.7 

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  • Appearance of Kondo effect in geometric frustration system Ce6Ni6P17 International conference

    N.Takeda 他

    Strongly Correlated Electron Systems 2017  2017.7 

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  • Superconducting gap of the single crystal beta-PdBi2 International conference

    H.Matsuzaki, K.Nagai, N.Kase, T.Nakano, N.Takeda

    29th International Symposium on Superconductivity(ISS2016)  2016.12 

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  • Upper critical field of the single crystal La(O,F)BiSe2 International conference

    Y.Terui, N.Kase, T.Nakano, N.Takeda

    29th International Symposium on Superconductivity(ISS2016)  2016.12 

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    Venue:Tokyo  

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  • NMR studies on Polyphosphide Ce6Ni6P17 International conference

    T.Koyama, H.Yamada, K.Ueda, T.Mito, Y.Aoyama, T.Nakano, N.Takeda

    TMU International Symposium2015  2015 

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  • Antiferromagnetic transition of the caged compound TmTi2Al20 International conference

    Naoki Kase, Yasuyuki Shimura, Shunichiro Kittaka, Toshiro Sakakibara, Satoru Nakatsuji, Tomohito Nakano, Naoya Takeda, Jun Akimitsu

    Strongly Correlated Electron Systems 2014  2014 

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  • Another phase transition beside superconductivity in skutterudite LaOs4P12 International conference

    N.Takeda, N.Hoshi, S. Yodono, R.Takeda, N.Kurotaki, T.Nakano

    Strongly Correlated Electron Systems 2013  2013.8 

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    Venue:Tokyo  

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  • Magnetic properties of Ce6Ni6P17 with geomeric frustration International conference

    N.Takeda et

    SCES2011  2011.8 

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    Venue:Cambridge  

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  • Specific heat of Ce3Pd20Si6 single crystal in magnetic fields International conference

    H.Ono, T.Nakano, N.Takeda e

    SCES2011  2011.8 

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    Venue:Cambrige  

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  • Pressure effect of transport properties of hexagonal Yb2Ni12P7 International conference

    T.Nakano, R.Sato, K.Tsuchiya, N.Takeda

    SCES2011  2011.8 

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    Venue:Cambridge  

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  • The magnetic moment without magnetic phase transition in insulating RR'S3 International conference

    H.Ono etal

    International Conference on Heavy Electrons 2010  2010.9 

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    Venue:Tokyo  

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  • Physical Properties of Unfilled Skutterudite NiP3 International conference

    N.Takeda, T.Nakajo, H.Ono, K.Tatematsu, T.Nakano

    International Conference on Heavy Electrons 2010  2010.9 

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    Venue:Tokyo  

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  • Low-temperature magnetic properties of Ho2Ni12P7 International conference

    K.Tsutiya

    International Conference on Heavy Electrons 2010  2010.9 

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    Venue:Tokyo  

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  • Seebeck coefficient for concentrated Kondo compound CePtSi2 under hydrostatic pressure International conference

    T.Nakano

    International Conference on Heavy Electrons 2010  2010.9 

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    Venue:Tokyo  

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  • Heavy Fermion Behaviors of Tm2Rh12P7 International conference

    K.Tatematsu

    International Coference on "New Quantum Phenomena in Skutterudite and Related Systems"  2007.9 

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    Venue:Tokyo  

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  • Metamagnetism of ferromagnetic Kondo compound SmFe4P12 International conference

    N.Takeda, H.Mitamura

    International Coference on "New Quantum Phenomena in Skutterudite and Related Systems"  2007.9 

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    Venue:Tokyo  

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Awards

  • JPSP注目論文賞

    2007.4   日本物理学会  

    「S.Masaki」, T.Mito」, M.Takemura」, 「S.Wada」, 「H.Harima」, 「D.Kikuchi」, 「H.Sato」, 「H.Sugawara」, 「N.Takeda」, 「G-q. Zheng」

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    Award type:Honored in official journal of a scientific society, scientific journal  Country:Japan

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Research Projects

  • 純良極微小試料による超伝導の精密測定

    2016.4

    日本学術振興会  科学研究費助成事業  基盤研究(C)

    武田直也

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    Authorship:Principal investigator  Grant type:Competitive

    Grant amount:\3500000 ( Direct Cost: \2450000 、 Indirect Cost:\1050000 )

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  • ラットリング物質の探索・創製と電子・格子物性の研究

    2008.4 - 2013.3

    科学研究費助成事業  新学術領域研究

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    Grant type:Competitive

    Grant amount:\30300000 ( Direct Cost: \21210000 、 Indirect Cost:\9090000 )

    ラットリング物質の発見を目指し、ラットリングに起因する新奇現象を解明する。

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  • 新規充填型化合物の合成と熱電材料の探索

    2006.4 - 2007.3

    財団法人 内田エネルギー科学振興財団  受託研究(一般受託研究) 

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    Grant type:Competitive

    Grant amount:\600000

    充填スクッテルダイトと類似した特徴を持つ新しい充填型化合物の探索を行った

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  • 充填スクッテルダイト構造に由来する新奇量子現象の解明

    2003.4 - 2008.3

    科学研究費助成事業  特定領域研究

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    Grant type:Competitive

    Grant amount:\19307000 ( Direct Cost: \19307000 )

    充填スクッテルダイト化合物の研究をした

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  • Filled Skutterudite型化合物の研究

    2000.4 - 2002.3

    科学研究費助成事業  基盤研究(C)

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    Grant type:Competitive

    Grant amount:\3300000 ( Direct Cost: \3300000 )

    Filled Skutterudite型化合物の研究をした

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  • 有機磁性体の極低温物性(比熱,磁化)

    1994.4 - 1995.3

    科学研究費助成事業  重点領域研究

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    Grant type:Competitive

    Grant amount:\2000 ( Direct Cost: \2000 )

    有機強磁性体を世界で最も多く発見した。

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  • study of multipole ordering

    1994.1

    Cooperative Research 

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    Grant type:Competitive

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  • 有機磁性体の極低温物性

    1993.4 - 1994.3

    科学研究費助成事業  重点領域研究

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    Grant type:Competitive

    Grant amount:\1800 ( Direct Cost: \1800 )

    有機強磁性体の探索を行った。

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  • 有機磁性体における量子効果

    1993.4 - 1994.3

    科学研究費助成事業  一般研究(C)

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    Grant type:Competitive

    Grant amount:\2100 ( Direct Cost: \2100 )

    有機強磁性体の量子効果を研究した。

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  • Study of filled skutterudite

    1993.1

    Grant-in-Aid for Scientific Research 

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    Grant type:Competitive

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  • Organic Magnetism

    1992.3 - 1996.10

    Cooperative Research 

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    Grant type:Competitive

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  • Materials Research in Heavy Fermion Systems

    1992.1

    The Other Research Programs 

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    Grant type:Competitive

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  • Study of Fermi Surface in Heavy Fermion Systems

    1987.1 - 1992.3

    The Other Research Programs 

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    Grant type:Competitive

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Teaching Experience (researchmap)

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Teaching Experience

  • 超伝導物性論

    2022
    Institution name:新潟大学

  • 電子物性論

    2021
    Institution name:新潟大学

  • 自然科学総論II

    2021
    Institution name:新潟大学

  • 機能材料工学実験I

    2021
    Institution name:新潟大学

  • 技術英語II

    2020
    Institution name:新潟大学

  • 論文輪講I

    2020
    Institution name:新潟大学

  • 論文輪講II

    2020
    Institution name:新潟大学

  • 技術英語I

    2020
    Institution name:新潟大学

  • 材料科学実験I

    2019
    Institution name:新潟大学

  • 基礎量子力学(工)

    2018
    Institution name:新潟大学

  • 機能材料工学実験II

    2018
    Institution name:新潟大学

  • 物理学基礎BⅠ

    2017
    Institution name:新潟大学

  • 材料科学概論

    2017
    Institution name:新潟大学

  • 工学リテラシー入門(化学材料分野)

    2017
    Institution name:新潟大学

  • 基礎統計物理

    2015
    Institution name:新潟大学

  • ソーラー水素エネルギー国際会議コミュニケーション

    2015
    Institution name:新潟大学

  • 技術英語入門

    2015
    Institution name:新潟大学

  • 機能材料科学総論Ⅰ

    2013
    Institution name:新潟大学

  • 材料生産システム特定研究Ⅰ

    2013
    -
    2015
    Institution name:新潟大学

  • 機能材料科学セミナーⅠ

    2013
    -
    2015
    Institution name:新潟大学

  • 機能材料科学文献詳読Ⅰ

    2013
    -
    2015
    Institution name:新潟大学

  • 研究発表演習・発表

    2013
    -
    2015
    Institution name:新潟大学

  • 機能材料科学文献詳読Ⅱ

    2013
    -
    2015
    Institution name:新潟大学

  • 機能材料科学セミナーⅡ

    2013
    -
    2015
    Institution name:新潟大学

  • 材料生産システム特定研究Ⅱ

    2013
    -
    2015
    Institution name:新潟大学

  • 機能材料科学演習

    2012
    -
    2015
    Institution name:新潟大学

  • 技術者倫理

    2010
    -
    2015
    Institution name:新潟大学

  • 卒業研修

    2009
    Institution name:新潟大学

  • 自然科学総論Ⅱ

    2009
    -
    2018
    Institution name:新潟大学

  • 量子力学応用・演習

    2009
    -
    2017
    Institution name:新潟大学

  • 工学リテラシー入門(機能材料工学科)

    2009
    -
    2016
    Institution name:新潟大学

  • インターンシップ

    2009
    -
    2013
    Institution name:新潟大学

  • 物理数学

    2009
    -
    2010
    Institution name:新潟大学

  • 機能材料工学実験IV

    2009
    Institution name:新潟大学

  • 基礎解析力学

    2009
    Institution name:新潟大学

  • 電磁気学応用・演習

    2008
    Institution name:新潟大学

  • 技術英語

    2007
    Institution name:新潟大学

  • 論文輪講

    2007
    Institution name:新潟大学

  • 磁性・超伝導

    2007
    Institution name:新潟大学

  • 卒業研究

    2007
    Institution name:新潟大学

  • 機能材料工学実験I

    2007
    -
    2021
    Institution name:新潟大学

  • 電子物性論

    2007
    -
    2021
    Institution name:新潟大学

  • 超伝導物性論

    2007
    -
    2020
    Institution name:新潟大学

  • 基礎量子力学

    2007
    -
    2017
    Institution name:新潟大学

  • 物理学基礎A I

    2007
    -
    2016
    Institution name:新潟大学

  • 卒業基礎研究

    2007
    -
    2008
    Institution name:新潟大学

  • スタディスキルズ(機能材料工学)

    2007
    -
    2008
    Institution name:新潟大学

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