2024/02/02 更新

写真a

ナカノ トモヒト
中野 智仁
NAKANO Tomohito
所属
教育研究院 自然科学系 生産デザイン工学系列 准教授
工学部 准教授
自然科学研究科 材料生産システム専攻 機能材料科学 准教授
職名
准教授
外部リンク

学位

  • 博士(工学) ( 2002年3月   室蘭工業大学 )

研究分野

  • ナノテク・材料 / 金属材料物性

  • 自然科学一般 / 磁性、超伝導、強相関系

  • ナノテク・材料 / 無機材料、物性

  • 環境・農学 / 環境材料、リサイクル技術

経歴

  • 新潟大学   自然科学研究科 材料生産システム専攻 機能材料科学   准教授

    2012年11月 - 現在

  • 新潟大学   機能材料工学科   准教授

    2012年11月 - 2017年3月

  • 新潟大学   材料物性工学   助教

    2009年9月 - 2012年10月

 

論文

  • Magnetic separation of nickel-plating waste liquid using a high temperature superconducting bulk magnet

    T Oka, K Sudo, J L Dadiel, N Sakai, H Seki, M Miryala, M Murakami, T Nakano, M Ooizumi, K Yokoyama, M Tsujimura

    Superconductor Science and Technology   35 ( 9 )   094006 - 094006   2022年9月

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    掲載種別:研究論文(学術雑誌)   出版者・発行元:IOP Publishing  

    Abstract

    Ni is one of the important metal resources. Because Ni-containing waste liquid is drained after several plating turns in the factories, an effective recycling technique should be developed. A unique magnetic separation technique using high temperature superconducting bulk magnet has succeeded in collecting Ni-sulfate crystals, which were fabricated from the Ni-plating waste liquid. Pulsed-field magnetizing method was employed to activate the bulk magnet up to 2.80 T, which produced a field space of 1.40 T on the surface of the waste channel. Green coarse crystals were attracted from the flowing stream of Ni-saturated liquid containing weakly-magnetic particles of Ni-compounds. The magnetically-collected particles were identified as paramagnetic NiSO<sub>4</sub>/6H<sub>2</sub>O crystals, and slight differences in Ni concentration and grain size were observed between the particles attracted and not-attracted to the 1.8 T magnetic pole. In both cases, the large grains were found to consist of a single phase. The compound can be used as a raw material in the Ni-recycle process. This preferential extraction suggests a novel recycling method of Ni resource.

    DOI: 10.1088/1361-6668/ac7f61

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    その他リンク: https://iopscience.iop.org/article/10.1088/1361-6668/ac7f61/pdf

  • 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年7月

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    掲載種別:研究論文(学術雑誌)  

    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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  • Pressure dependence of the magnetic ground state in CePtSi2

    S. E. Dissanayake, F. Ye, W. Tian, M. Matsuda, H. Muto, S. Suzuki, T. Nakano, S. Watanabe, J. Gouchi, Y. Uwatoko

    Physical Review B   105 ( 24 )   2022年6月

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    掲載種別:研究論文(学術雑誌)  

    CePtSi2 was reported to exhibit an antiferromagnetic order below T∗=1.8 K at ambient pressure, a valence state change at ∼1.2 GPa, and superconductivity in the range between 1.4 and 2.1 GPa with a maximum transition temperature of 0.14 K [T. Nakano, Phys. Rev. B 79, 172507 (2009)1098-012110.1103/PhysRevB.79.172507]. We have performed polycrystalline and single-crystal neutron diffraction experiments to determine the magnetic structure under ambient and high pressures. We found incommensurate magnetic peaks with a magnetic propagation vector of (0.32,0,0.11) at ambient pressure below TSDW∼1.25 K. Those magnetic peaks originate from a spin-density-wave order with the easy axis along the c axis and an averaged ordered moment of 0.45(5)μB, suggesting that there may be an intermediate phase between T∗ and TSDW. Applying pressures, the magnetic propagation vector shows no change and the magnetic order disappears around 1.0 GPa, which is much lower than the critical pressure for the superconducting phase. The results suggest that other than magnetic fluctuations may play a primary role in the superconducting pairing mechanism.

    DOI: 10.1103/PhysRevB.105.245111

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  • High-Pressure Thermopower of the Mott Insulator Ca<inf>2</inf>RuO<inf>4</inf>

    Isuzu Sano, Tomohito Nakano, Akitoshi Nakano, Hiroki Taniguchi, Fumihiko Nakamura, Ichiro Terasaki

    Journal of the Physical Society of Japan   91 ( 3 )   2022年3月

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    掲載種別:研究論文(学術雑誌)  

    We have measured and analyzed the thermopower of single-crystal samples of the Mott insulator Ca2RuO4 in high pressure up to 0.9 GPa. We find that the thermopower rapidly changes at a metal-insulator transition temperature, which is explained in terms of a percolation theory. In contrast, the thermopower in the insulator phase slightly decreases with increasing pressure well below the transition temperature, and is associated with thermodynamic quantities through the Kelvin formula. The pressure dependence is compared with the current-density dependence, and a possible origin for the current-enhanced thermopower is proposed.

    DOI: 10.7566/JPSJ.91.033703

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  • Feasible waste liquid treatment from electroless nickel-plating by intense magnetic field of HTS bulk magnets

    T. Oka, M. Furusawa, K. Sudo, L. Dadiel, N. Sakai, H. Seki, M. Miryala, M. Murakami, T. Nakano, M. Ooizumi, K. Yokoyama, M. Tsujimura

    Progress in Superconductivity and Cryogenics (PSAC)   23 ( 3 )   37 - 40   2021年

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    掲載種別:研究論文(学術雑誌)  

    Nickel (Ni) is a kind of the rare earth resources. Since Ni-containing waste is drained after several plating operations in the factories, the effective recycling technique has been expected to be introduced. An actual magnetic separation technique using HTS bulk magnet generating the strong magnetic field has succeeded in collecting the paramagnetic slurry containing Ni-sulphate coarse crystals which were fabricated from the Ni-plating waste. The Ni compound in the collected slurry was identified as NiSO4/6H2O, showing slight differences in the particle size and magnetic susceptibility between the samples attracted and not-attract to the magnetic pole. This preferential extraction suggests us a novel recycling method of Ni resource because the compound is capable of recycling back to the plating processes as a raw material.

    DOI: 10.9714/psac.2021.23.3.037

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  • Novel magnetizing technique using high temperature superconducting bulk magnets for permanent magnets in interior permanent magnet rotors

    T. Oka, S. Hasebe, J. Ogawa, S. Fukui, T. Nakano, N. Sakai, M. Miryala, M. Murakami, K. Yokoyama

    Superconductor Science and Technology   33 ( 8 )   2020年8月

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    掲載種別:研究論文(学術雑誌)  

    A novel magnetizing technique for permanent magnets (PMs) embedded in interior permanent magnet (IPM) motors has been proposed as a safer and more effective process than the conventional processes using copper pulse-coils. In the new process, the high temperature superconducting (HTS) bulk magnet, emitting an intense magnetic field of over 3 T, was employed to activate the rotor and PMs inside. A magnetic pole containing the HTS bulk magnet was scanned on the surface of the IPM rotor, resisting against the extremely strong attractive force between the magnet and rotor. Following experiments in the past, numerical simulation studies have been conducted to evaluate the magnetic field-trapping performances of the PMs. In this study, the numerical analysis of the magnetization behaviours was conducted for the PMs embedded in the rotor of the commercial air-conditioner motor in a hybrid car. The simulation results showed us that the demagnetized Nd-Fe-B plates in the rotor were fully magnetized in the intense static magnetic fields on the magnetic pole containing the HTS bulk magnet. The magnetizing behaviour in this peculiar magnetizing operation was made understandable by estimating the anisotropic easy-direction of the PM plates embedded in the rotor. The novel activation method for PM is characterized as a no-shock and no-heating method, which would promote the degree of freedom in the IPM motor design.

    DOI: 10.1088/1361-6668/ab9543

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  • Superconductivity of the ternary stannide Y<inf>5</inf>Co<inf>6</inf>Sn<inf>18</inf>

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

    Physica B: Condensed Matter   587   2020年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER  

    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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  • Magnetizing Technique for Permanent Magnets in IPM Motor Rotors Using HTS Bulk Magnet

    T. Oka, S. Hasebe, J. Ogawa, S. Fukui, T. Nakano, K. Yokoyama, M. Miryala, N. Sakai, M. Murakami

    IEEE Transactions on Applied Superconductivity   30 ( 4 )   2020年6月

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    掲載種別:研究論文(学術雑誌)  

    A unique activation technique for permanent Nd-Fe-B magnets which were embedded in the rotors of interior permanent magnet (IPM) motors has been developed as a magnetizing tool with use of high temperature superconducting (HTS) bulk magnet. The experimental and numerical simulation studies were conducted to evaluate the magnetic field-trapping performances of the rotor of air-conditioner compressor in the hybrid-type automobiles. The sample rotor containing six demagnetized permanent magnet plates were exposed in the intense static magnetic fields above the magnetic pole which contained the bulk magnet generating over 4 T. As a result, the sample magnets were perfectly magnetized in the static magnetic field. The precise simulation on the flux distribution in the rotor clarified that it is important to make the flux direction in the rotor core and the easy magnetization axis of PM identical. We convinced this activation technique should enable us to promote the degrees of freedom of motor designing and its processing.

    DOI: 10.1109/TASC.2020.2989181

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  • Coexistence of localized and heavy itinerant states in antiferromagnetic CePtG e2 査読

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

    Physical Review B   100 ( 3 )   2019年7月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:AMER PHYSICAL SOC  

    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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  • CePtSi<sub>2</sub>の圧力誘起超伝導 招待 査読 国際共著

    中野智仁

    高圧力の科学と技術   29 ( 4 )   283 - 289   2019年

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)   出版者・発行元:日本高圧力学会  

    <p>In this article, I introduce the pressure-induced superconductivity in CePtSi<sub>2</sub> with its discovering process. At ambient pressure, the orthorhombic CePtSi<sub>2</sub> shows an antiferromagnetic order below <i>T</i><sub>N</sub>=1.8 K. <i>T</i><sub>N</sub> disappears above 1.2 GPa, and a superconducting phase appears with <i>T</i><sub>c</sub>~0.1 K. Significant decrease of the <i>A</i> coefficient in resistivity and discrepancy between quantum critical point (QCP) and the center of the superconducting phase suggest the valence mediated superconductivity as that observed in CeCu<sub>2</sub> (Si,Ge)<sub>2</sub>.</p>

    DOI: 10.4131/jshpreview.29.283

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  • Collecting Ni-Sulfate Compound from Electroless Plating Waste by Magnetic Separation Technique with Use of HTS Bulk Magnets

    T. Oka, S. Sasaki, H. Sasaki, S. Fukui, J. Ogawa, T. Sato, T. Nakano, M. Ooizumi, M. Tsujimura, K. Yokoyama

    Journal of Physics: Conference Series   1054 ( 1 )   2018年7月

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    掲載種別:研究論文(国際会議プロシーディングス)  

    © Published under licence by IOP Publishing Ltd. The authors have developed a useful technique for extracting the Ni-sulfate compound from the "processed waste/fluid" of the electroless Ni-plating processes. After forming the fine NiHPO3 precipitate from the waste, the coarse NiSO4 crystals were synthesized through the reaction with the concentrated sulfuric acid. In the experiment, the open-gradient magnetic separation was employed to collect the NiSO4 crystals from the muddy mixture composed of these compounds. The experiments were practically conducted with use of the Gd123-based HTS bulk magnets generating up to 3.99 T, which were activated by the field cooling magnetizing method operated at 35 K. Intense magnetic field emitted from the bulk magnet attracted the paramagnetic fluid and coarse NiSO4 crystals on the bottom of the water channel, forming a giant drop of NiSO4-saturated clear fluid and the slurry of nickel sulfate hexahydrate. This preferential collection suggests a feasible recycling process of Ni resource as a raw material in the plating processes.

    DOI: 10.1088/1742-6596/1054/1/012047

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  • Fundamental properties of a new samarium compound SmPtSi<inf>2</inf> 査読

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

    Physica B: Condensed Matter   536   297 - 299   2018年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE BV  

    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 T-H = 8.6 K and T-L = 5.6 K. The resistivity of a single crystal of SmPtSi2 shows a hump-type anomaly just below T-H and a sudden decrease at T-L, 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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  • A review article: Compact magnetic field generators containing HTS bulk magnets cooled by refrigerators and their feasible applications

    Tetsuo Oka, Jun Ogawa, Satoshi Fukui, Takao Sato, Tomohito Nakano, Kazuya Yokoyama, Takashi Nakamura, Hiroyuki Fujishiro, Koshichi Noto

    High-Temperature Superconductors: Occurrence, Synthesis and Applications   291 - 306   2018年1月

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    掲載種別:論文集(書籍)内論文  

    Various types of strong magnetic field generators with use of HTS bulk magnets and the small-scale refrigerators have been actually proposed and experimentally estimated for the feasible applications. The most characteristic feature of bulk magnets is regarded as compact and strong field generators with respect to their magnetic field spaces or their machine structures of themselves. Among them, the magnetic flux density of the face-toface magnetic poles reached 3.2 T and 4.4 T when they were activated by the pulsed field magnetization and the field cooling method, respectively. Furthermore, a very small bulk magnet generating 2.8 T and the system featured by the wide magnetic poles containing seven magnets have been constructed with use of ST pulse tube coolers in order to expand the feasible application areas. On the other hand, although the bulk magnets are characterized by their steep field distributions, we attempted to gain the uniform magnetic field space, and successfully achieved the uniformity of 385 ppm in 4 mm range by combining the deformed magnetic field profiles which generated between the face-to-face magnetic poles. The performances of these unique systems have exceeded those of the conventional electromagnet or any permanent magnets by far, demonstrating the superiority to other strong magnetic field generators.

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

    Naoki Kase, Yusuke Terui, Tomohito Nakano, Naoya Takeda

    PHYSICAL REVIEW B   96 ( 21 )   2017年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:AMER PHYSICAL SOC  

    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 査読

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

    Journal of Physics: Conference Series   871 ( 1 )   5 pages - 12005   2017年7月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:Institute of Physics Publishing  

    Single crystal growth and superconducting properties of LaO0.5F0.5BiSe2 are studied. Single crystals of LaO0.5F0.5BiSe2 were grown by a CsCl-flux method. Electrical resistivity ρ(T) measurements were performed to elucidate its superconducting properties. The ρ(T) shows metallic behavior and superconducting transition at 4.0 K. From ρ(T) measurements in several magnetic fields, upper critical fields Hc2∥ab(0) and Hc2∥c (0) are estimated to be 7.05 T and 0.52 T, respectively. The superconducting anisotropic parameter Γ is determined to be 13.6.

    DOI: 10.1088/1742-6596/871/1/012005

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  • Superconducting gap of the single crystal β-PdBi2 査読

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

    Journal of Physics: Conference Series   871 ( 1 )   - 12004   2017年7月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

    DOI: 10.1088/1742-6596/871/1/012004

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  • Heavy-Fermion Compound of the Ternary Phosphide Ce2Pt8P with a Non-Centrosymmetric Structure 査読

    Naoki Kase, Shoh Furukawa, Tomohito Nakano, Naoya Takeda

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   86 ( 1 )   2017年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:PHYSICAL SOC JAPAN  

    The low-temperature properties of Ce2Pt8P are studied by magnetic susceptibility chi(T), electrical resistivity rho(T), and specific heat C(T) measurements. The crystal structure is considered to be analogs of the CePt3Si-type structure. From the magnetic susceptibility chi(T), the effective paramagnetic moment mu(eff) is estimated to be 2.30 mu(B)/Ce, suggesting that the valence state of Ce ions is expected to be close to trivalent (Ce3+). The paramagnetic Curie-Weiss temperature theta cw is determined to be 12 K. The electrical resistivity rho(T) shows -ln T dependence with a small slope from 10 to 3K, which indicates a weak Kondo anomaly. The specific heat exhibits a lambda-type anomaly at around T* = 1.0 K, while the magnetic entropy at T* is reduced to 80% of R ln 2. The linear coefficient of specific heat is determined to be 145 mJ=(mol-Ce.K-2). From several measurements, Ce2Pt8P can be classified as a moderate heavy-fermion compound. The ground state is far from the quantum-critical point (QCP) compared with CePt3Si. La2Pt8P shows normal metallic behavior and no superconductivity is observed above 0.28 K.

    DOI: 10.7566/JPSJ.86.014704

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

    Naoki Kase, Ryoh Satoh, Tomohito Nakano, Naoya Takeda

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   85 ( 10 )   - 105001   2016年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:PHYSICAL SOC JAPAN  

    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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  • Superconductivity in Ternary Pnictide SrPd2Sb2 Polymorphs 査読

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

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   85 ( 4 )   - 43701   2016年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:PHYSICAL SOC JAPAN  

    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) 査読

    Naoki Kase, Harufumi Suzuki, Tomohito Nakano, Naoya Takeda

    SUPERCONDUCTOR SCIENCE & TECHNOLOGY   29 ( 3 )   35011   2016年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:IOP PUBLISHING LTD  

    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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  • NMR studies on polyphosphide Ce6Ni6P17 査読

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

    Journal of Physics: Conference Series   683 ( 1 )   12027   2016年2月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:Institute of Physics Publishing  

    We report the result of 31P nuclear magnetic resonance (NMR) studies on Ce6Ni6P17. The observed NMR spectra show a Lorentzian-type and an asymmetric shapes, reflecting the local symmetry around each P site in the cubic unit cell. We have identified the observed NMR lines corresponding to three inequivalent P sites and deduced the temperature dependence of the Knight shift for each site. The Knight shifts increase with decreasing temperature down to 1.5 K, indicating a localized spin system of Ce6Ni6P17. Antiferromagnetic correlation between 4f spins is suggested from the negative sign of the Weiss-temperature.

    DOI: 10.1088/1742-6596/683/1/012027

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

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

    JOURNAL OF PHYSICS-CONFENCE SERIES   ( 683 )   012021   2016年2月

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    記述言語:英語  

    DOI: 10.1088/1742-6596/683/1/012021

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  • Single-crystal growth and superconducting state of LaO0.5F0.5Bi(S0.8Se0.2)(2) 査読

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

    PROCEEDINGS OF THE 28TH INTERNATIONAL SYMPOSIUM ON SUPERCONDUCTIVITY (ISS 2015)   81   53 - 56   2016年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:ELSEVIER SCIENCE BV  

    Single crystals of LaO0.5F0.5Bi(S0.8Se0.2)(2) were grown by a CsCl-flux method. Electrical resistivity rho(T) measurements were performed to reveal its superconducting properties. The rho(T) of the single crystal shows semiconducting-like behavior and superconducting transition at 3.4 K. The value is slightly higher than that of the polycrystalline sample with substitution amounts of x = 0.2 (T-c similar to 2.5 K). From rho(T) measurements in several magnetic fields, mu H-0(c2)//ab(0) and mu H-0(c2)//c(0) are estimated to be 17.2 T and 0.59 T, respectively. The superconducting anisotropic parameter gamma is determined to be 29.2. (C) 2016 The Authors. Published by Elsevier B.V.

    DOI: 10.1016/j.phpro.2016.04.023

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

    Harufumi Suzuki, Naoki Kase, Tomohito Nakano, Naoya Takeda

    PROCEEDINGS OF THE 28TH INTERNATIONAL SYMPOSIUM ON SUPERCONDUCTIVITY (ISS 2015)   81   57 - 60   2016年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:ELSEVIER SCIENCE BV  

    The polycrystalline NbIrSi, TaIrSi and NbPtSi with an orthorhombic structure (space group Pnma) were synthesized by an arc-melting method. Electrical resistivity rho(T) measurement in three compounds were performed from 0.28 to 300 K. rho(T) of NbIrSi indicates typical metallic behavior with no superconducting transition down to 0.28 K. Superconducting-like behavior is observed around 0.5 K in TaIrSi, but zero resistivity cannot be observed down to 0.28 K. rho(T) of NbPtSi shows superconductivity at 1.24 K. From rho(T) in several magnetic fields, the upper critical field mu H-0(c2)(0) of NbPtSi is obtained to be 1.15 T. (C) 2016 The Authors. Published by Elsevier B.V.

    DOI: 10.1016/j.phpro.2016.04.024

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

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

    TMU INTERNATIONAL SYMPOSIUM ON NEW QUANTUM PHASES EMERGING FROM NOVEL CRYSTAL STRUCTURE   683   - 12034   2016年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:IOP PUBLISHING LTD  

    We find that low temperature superconducting phase (LSP) of SrPd2Sb2 with the CaBe2Ge2-type structure at T-c = 1.4 K. Superconducting transition is found at T-c = 1.4 K in electrical resistivity rho(T). Specific heat C(T) shows a clear anomaly at T-c = 1.2 K, which shows that superconductivity is of bulk nature. From rho(T) in several magnetic fields, the upper critical field mu 0IIc2(0) is estimated to be 36 mT, which is strongly suppressed, and is 16.7 times smaller than that of 1.9 K phase.

    DOI: 10.1088/1742-6596/683/1/012034

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  • Thermal Conductivity Measurements of Caged Structural Superconductors 査読

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

    PROCEEDINGS OF THE 28TH INTERNATIONAL SYMPOSIUM ON SUPERCONDUCTIVITY (ISS 2015)   81   61 - 64   2016年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:ELSEVIER SCIENCE BV  

    Thermal conductivity of Ca3Rh4Sn13 and Sr3Ir4Sn13 were measured in magnetic fields to reveal superconducting state. From magnetic susceptibility chi(T) and electrical resistivity rho(T) measurements, superconducting transition temperature T-c of Ca3Rh4Sn13 and Sr3Ir4Sn13 is determined to be 8 and 5 K, respectively. Thermal conductivity kappa(T) of Ca3Rh4Sn13 indicates that superconducting state is nodeless s-wave, because residual thermal conductivity kappa(0)/T in zero magnetic field is very small. On the other hand, kappa(T) of Sr3Ir4Sn13 in zero magnetic field suggests that superconductivity possesses nodal gap rather than full gap. Whether nodal superconducting gap exists or not still remains to be clarified, because there is a possibility that the achieving temperature is insufficient to discuss superconducting state. (C) 2016 The Authors. Published by Elsevier B.V.

    DOI: 10.1016/j.phpro.2016.04.025

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

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

    TMU INTERNATIONAL SYMPOSIUM ON NEW QUANTUM PHASES EMERGING FROM NOVEL CRYSTAL STRUCTURE   683   - 12019   2016年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:IOP PUBLISHING LTD  

    We synthesized single crystals of Zn-based Sm-compound SmOs2Zn20. T-dependence of magnetization M(T) shows a sudden increase at the ferromagnetic transition temperature T-C similar to 3 K. T-dependence of electrical resistivity rho(T) shows typical metallic behavior. At T-C, rho(T) slightly decreases, which originates from the ferromagnetic transition. Specific heat C(T) shows a clear but broad anomaly at T-C. Magnetic entropy S-mag(T) at T-C is about R ln 2, and suggests that a Gamma(7) doublet of the J = 5/2 multiplet is the ground state.

    DOI: 10.1088/1742-6596/683/1/012019

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  • Pressure-induced novel electronic state of Fe70Ni30 Invar alloy 査読

    Gendo Oomi, Ryohei Saito, Masashi Ohashi, Tomohito Nakano

    20TH INTERNATIONAL CONFERENCE ON MAGNETISM, ICM 2015   75   785 - 791   2015年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:ELSEVIER SCIENCE BV  

    The electrical resistance and magnetoresistance of Fe70Ni30 Invar alloy have been measured at high pressure up to 15 GPa. It is found that the coefficients of T-2 term in the electrical resistance increases with increasing pressure but tends to saturate above 12 GPa suggesting a peak above 15 GPa, which implies a pressure-induced quantum phase transition. We found for the first time that the magnetoresistance at 4.2 K is negative below 11 GPa but becomes positive above 12 GPa. This corresponds to a crossover in the electronic state from localized moment regime to a paramagnetic or new magnetic state. The origins will be discussed briefly in connection with the recent experimental results and theoretical calculation.

    DOI: 10.1016/j.phpro.2015.12.102

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  • Antiferromagnetic transition of the caged compound TmTi2Al20 査読

    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   - 12052   2015年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:IOP PUBLISHING LTD  

    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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  • 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年7月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Thermal and Magnetic Properties in Ce1-xErxAl2 Intermetallic Compounds 査読

    Masashi Ohashi, Hidenori Miyagawa, Tomohito Nakano, Gendo Oomi, Vladimir Sechovsky, Isamu Satoh, Takemi Komatsubara

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   83 ( 2 )   2014年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:PHYSICAL SOC JAPAN  

    The magnetic and thermal properties of Ce1-xErxAl2 compounds have been studied using specific heat, dc magnetization, and ac susceptibility measurements. All these compounds are isomorphic with the MgCu2 Laves phase, and the lattice parameter decreases almost linearly with the increasing Er concentration x. The dc magnetic susceptibility follows the Curie-Weiss law, and the Weiss temperature continuously changes from Theta = -24K for x = 0 to Theta = 15K for x = 1, indicating a change from antiferro-magnetism to ferromagnetism. Theta changes from negative to positive at around x = 0.2 where where a field-induced metamagnetic transition disappears. The magnetic ordering state continuously changes with the change in x from antiferromagnetic to ferromagnetic through a spin-glass-like behavior.

    DOI: 10.7566/JPSJ.83.024701

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  • Magnetic Phase Diagram of Ce1-xErxAl2 intermetallic compounds

    Ohashi Masashi, Miyagawa Hidenori, Oomi Gendo, Nakano Tomohito, Satoh Isamu, Komatsubara Takemi

    JPS Conference Proceedings   3   1183 - 1183   2014年1月

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    記述言語:英語   出版者・発行元:The Physical Society of Japan = 日本物理学会  

    The magnetic and thermal properties of Ce1−xErxAl2 compounds have been studied using electrical resistivity and magnetic susceptibility measurements. The magnetic ordering temperature continuously changes with a change from antiferro-magnetism (CeAl2) to ferro-magnetism (ErAl2) appears. The magnetic ordering temperature is continuously changed as a function of Er concentration x. A spin glass behavior was found between x = 0.08 and 0.4. The magnetic phase diagram was compiled as a function of x.Embargo Period 12 months

    DOI: 10.7566/JPSCP.3.011083

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  • Effect of Pressure and Ion Beam Irradiation on the Giant Magnetoresistance of Fe/Cr Magnetic Multilayers 査読

    G. Oomi, T. Yayoi, T. Nakano, K. Saito, K. Takanashi, S. Mitani, A. Kohno, K. Sagara

    IEEE TRANSACTIONS ON MAGNETICS   50 ( 1 )   2014年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC  

    The effect of high pressure and ion beam irradiation on the magnitude of giant magnetoresistance (GMR) of Fe/Cr magnetic multilayers (MML), [Fe(20 angstrom)/Cr(t angstrom)](20) (abbreviated as Fe/Cr(t)), has been measured at 77.4 K. It is found that the GMR of Fe/Cr(8) is decreased but that of Fe/Cr(30) is increased by applying pressure. By ion beam irradiation, the electrical resistance of these MMLs is increased significantly and the magnitude of GMR is decreased. Furthermore we have measured the GMR of irradiated Fe/Cr(8) and Fe/Cr(30) under high pressure and compared the results with the sample before irradiation. The GMR of Fe/Cr(8) after the irradiation is found to increase with pressure and the pressure-coefficient of the saturation resistivity is extremely large. These results are discussed on the basis of the spin dependent scattering by the roughness at the interfaces and also bulk scattering in MML in connection with an irradiation-induced instability of the electronic states in Fe/Cr(8).

    DOI: 10.1109/TMAG.2013.2277875

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  • Transport properties of a single crystal of pressure-induced superconductor CePtSi2 in the magnetic field 査読

    Tomohito Nakano, Shintaro Onuki, Naoya Takeda

    PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS   493   109 - 111   2013年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE BV  

    We measured the electrical resistivity of the single crystal of pressure-induced superconductor CePtSi2, which was synthesized by the In-flux method, with the excitation current parallel to the tetragonal a-axis at various magnetic fields parallel to the c-axis. The Neel temperature T-N of 1.8 K at 0 T decreases with increasing magnetic field and disappears above B-c similar to 4.5 T. In the low-temperature region, the resistivity exhibits a Fermi-liquid-like T-2-dependence below T-FL similar to 1 K, which does not show a significant change up to B-c but increases above Bc. The resistivity drastically decreases by applying a magnetic field, and the magnetoresistance ratio attains to similar to 10, at 3.7 K. (C) 2013 Published by Elsevier B.V.

    DOI: 10.1016/j.physc.2013.03.040

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

    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年8月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    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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  • Transport Properties of a Single Crystal of Pressure-Induced Superconductor CePtSi2 査読

    Tomohito Nakano, Shintaro Onuki, Naoya Takeda

    JOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISM   26 ( 6 )   2135 - 2137   2013年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:SPRINGER  

    We synthesized single crystals of pressure-induced superconductor CePtSi2 by an In-flux method, and measured its electrical resistivity rho under hydrostatic pressure. At ambient pressure, rho shows two maxima at T-1 = 3.7 K and T-2 = 33 K, and a downward bend at the Neel temperature T-N. With increasing pressure T-N decreases and disappears above 1.11 GPa, as reported in a polycrystalline sample. On the other hand, the maximum at T-1 becomes a shoulder above P-v = 1.21 GPa, and begins to increase with increasing pressure, indicating the beginning of a valence crossover.

    DOI: 10.1007/s10948-012-1896-3

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  • Magnetic phase diagram of clathrate compound Ce3Pd 20Si6 with quadrupolar ordering 査読

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

    Journal of Physics Condensed Matter   25 ( 12 )   126003(1-4)   2013年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    We present results of specific heat measurements on a Ce3Pd 20Si6 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 V [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. © 2013 IOP Publishing Ltd.

    DOI: 10.1088/0953-8984/25/12/126003

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

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

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   81 ( 7 )   074601-1-8 - 1   2012年7月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:PHYSICAL SOC JAPAN  

    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.

    DOI: 10.1143/JPSJ.81.074601

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  • Magnetic properties of cubic compound Ce6Ni6P17 with geometric frustrations 査読

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

    INTERNATIONAL CONFERENCE ON STRONGLY CORRELATED ELECTRON SYSTEMS (SCES 2011)   391   2012年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:IOP PUBLISHING LTD  

    We report the magnetic susceptibility and the low-temperature specific heat of Ce6Ni6P17 with geometric frustrations and La6Ni6P17 as a nonmagnetic counterpart. The magnetic susceptibility of Ce6Ni6P17 decreases monotonically with decreasing temperature and the specific heat shows a broad peak around 1.4 K. The evaluated magnetic entropy is about a half of Rln2 at 5.0 K. This result suggests that the frustrations persist down to very low temperatures and the residual entropy originate from frustration is present.

    DOI: 10.1088/1742-6596/391/1/012071

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  • Pressure-induced magnetic instability in Pd-Ni alloys 査読

    Gendo Oomi, Sadanori Iwai, Masashi Ohashi, Tomohito Nakano

    INTERNATIONAL CONFERENCE ON STRONGLY CORRELATED ELECTRON SYSTEMS (SCES 2011)   391 ( 1 )   12103   2012年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:IOP PUBLISHING LTD  

    The electrical resistivity rho(T) of dilute Pd-Ni alloys has been measured at high pressure up to 3 GPa. It is found that the rho(T) of the ferromagnetic Pd-Ni alloy shows an anomalous temperature dependence near the critical pressure P-c, where the ferromagnetism disappears. The results are analysed in the framework of quantum critical behaviour induced by pressure. The effect of magnetic field on the rho(T) is also examined. Different behaviour of magnetoresistance against pressure was found depending on the alloy concentration and discussed in connection with an instability of ferromagnetism.

    DOI: 10.1088/1742-6596/391/1/012103

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  • Pressure effect of transport properties of hexagonal Yb2Ni12P7 査読

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

    INTERNATIONAL CONFERENCE ON STRONGLY CORRELATED ELECTRON SYSTEMS (SCES 2011)   391 ( 1 )   12052   2012年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:IOP PUBLISHING LTD  

    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.

    DOI: 10.1088/1742-6596/391/1/012052

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  • Magnetic properties of Ce1-xLaxRu2Si 2 compounds 査読

    D. Abe, Y. Amakai, S. Murayama, N. Momono, H. Takano, T. Nakano, K. Matsubayashi, Y. Uwatoko

    Journal of Physics: Conference Series   391 ( 1 )   12001   2012年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:Institute of Physics Publishing  

    We have measured the susceptibility χ and resistivity ρ on single-crystalline Ce1-xLaxRu2Si2 for 0 ≤ x ≤ 0.8 in directions parallel (//) and perpendicular (⊥) to the c-axis. The χ// for 0.1 ≤ x ≤ 0.7 indicates a Curie-Weiss form at T &gt
    20 K and a typical AF maximum at TN. A significant crossover between TN and the magnitude of the Weiss temperature |Θ| occurs at about x = 0.2. The ρ⊥ shows a gap-type upturn at TN for 0.1 ≤ x ≤ 0.185 with rather a downward bend ρ// at around TN. The upturn in ρ⊥ at TN disappears for x = 0.2 with a sharp maximum ρ// at TN. A sharp peak in ρ⊥ takes place at TN for 0.3 ≤ x ≤ 0.7 with the sharp maximum ρ// at TN for 0.4 ≤ x ≤ 0.6. These results can be interpreted as the evolution from the itinerant SDW in the heavy-fermion band for 0.1 ≤ x &lt
    0.2 to the AF ordering with the local moment for x &gt
    0.2 up to x = 0.7. © Published under licence by IOP Publishing Ltd.

    DOI: 10.1088/1742-6596/391/1/012001

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  • Specific heat of Ce3Pd20Si6 single crystal in magnetic fields 査読

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

    Journal of Physics: Conference Series   391 ( 1 )   12054   2012年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:Institute of Physics Publishing  

    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'. © Published under licence by IOP Publishing Ltd.

    DOI: 10.1088/1742-6596/391/1/012054

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  • Specific heat of Ce3Pd20Si6 single crystal in magnetic fields 査読

    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   2012年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:IOP PUBLISHING LTD  

    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'.

    DOI: 10.1088/1742-6596/391/1/012054

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  • Magnetic properties of cubic compound Ce6Ni6P 17 with geometric frustrations 査読

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

    Journal of Physics: Conference Series   391 ( 1 )   12071   2012年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:Institute of Physics Publishing  

    We report the magnetic susceptibility and the low-temperature specific heat of Ce6Ni6P17 with geometric frustrations and La6Ni6P17 as a nonmagnetic counterpart. The magnetic susceptibility of Ce6Ni6P17 decreases monotonically with decreasing temperature and the specific heat shows a broad peak around 1.4K. The evaluated magnetic entropy is about a half of Rln2 at 5.0 K. This result suggests that the frustrations persist down to very low temperatures and the residual entropy originate from frustration is present. © Published under licence by IOP Publishing Ltd.

    DOI: 10.1088/1742-6596/391/1/012071

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  • Physical Properties of Unfilled Skutterudite NiP3 査読

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

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   80   SA035-1-2   2011年7月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:PHYSICAL SOC JAPAN  

    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.K-2.

    DOI: 10.1143/JPSJS.80SA.SA035

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  • Low-Temperature Magnetic Properties of Ho2Ni12P7 査読

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

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   80   SA081-1-2   2011年7月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:PHYSICAL SOC JAPAN  

    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 Neel temperature T-N = 10 K. The magnetization exhibits a metamagnetic behavior below T-N. The specific-heat shows a clear peak due to the transition. The crystalline-field ground state of Ho2Ni12P7 is a doublet.

    DOI: 10.1143/JPSJS.80SA.SA081

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  • The magnetic moment without magnetic phase transition in insulating RR'S-3(R=La, Ce, Pr, Nd; R'=Yb, Lu) 査読

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

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   80   2011年7月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:PHYSICAL SOC JAPAN  

    We have synthesized RR'S-3(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 chi(-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.

    DOI: 10.1143/JPSJS.80SA.SA079

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  • Seebeck coefficient of concentrated Kondo compound CePtSi2 under hydrostatic pressure 査読

    Tomohito Nakano, Shouta Yonamine, Masato Hedo, Takao Nakama, Masashi Ohashi, Naoya Takeda, Gendo Oomi

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   80   SA058-1-2   2011年7月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:PHYSICAL SOC JAPAN  

    We measured the Seebeck coefficient and resistivity of the concentrated Kondo compound CePtSi2 under hydrostatic pressure. At ambient pressure, S gradually increases with decreasing temperature and shows a maximum value S-max = 28 mu V/K around 86 K, followed by a minimum around 4.5 K, as is often observed in antiferromagnetic Ce-based heavy fermion compounds. With increasing pressure, S at high temperature increases, whereas S below 20 K does not show a significant change.

    DOI: 10.1143/JPSJS.80SA.SA058

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  • Pressure-induced half-metallic gap transformation in Co2MnSi observed by tunneling conductance spectroscopy 査読

    M. Nobori, T. Nakano, J. Hasegawa, G. Oomi, Y. Sakuraba, K. Takanashi, Y. Miura, Y. Ohdaira, Y. Ando

    PHYSICAL REVIEW B   83 ( 10 )   104410-1-6   2011年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:AMER PHYSICAL SOC  

    Applied hydrostatic pressure dependence of tunneling magnetoresistance (TMR) properties was investigated in magnetic tunnel junctions using the half-metallic Heusler alloy Co2MnSi (CMS). The half-metallic electronic structure in CMS was observed by measuring tunneling-conductance spectroscopy under different applied pressure. The effect of tetragonal distortion in CMS on the electronic structure was also calculated on the basis of the first-principle density-functional method. The TMR ratio showed no remarkable variation with increasing pressure from ambient to 1.5 GPa. It was clearly found that the valence-band edge of the half-metallic gap moved toward the Fermi level with increasing pressure up to 1.8 GPa. These experimental results showed good qualitative agreement with the theoretical calculation of density of states of CMS at high pressure.

    DOI: 10.1103/PhysRevB.83.104410

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  • Uniaxial colossal magnetoresistance in the Ising magnet SrCo12O19 査読

    S. Ishiwata, T. Nakano, I. Terasaki, H. Nakao, Y. Murakami, Y. Uwatoko, M. Takano

    PHYSICAL REVIEW B   83 ( 2 )   020401-1-4   2011年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:AMER PHYSICAL SOC  

    A new type of colossal magnetoresistance, which is extremely sensitive to the magnetic-field direction, was discovered in a magnetoplumbite-type hexagonal cobalt oxide SrCo12O19 synthesized under a high pressure of 3 GPa. SrCo12O19 has a unique combination of physical properties (i.e., uniaxial magnetic anisotropy originating from Ising spins on Co3+O5 bipyramids and a metal-insulator transition taking place on a three-dimensional network of Co3+/4+O6 octahedra). The resistivity decreases by a factor of 1000 when a magnetic field of 10 T is applied along the hexagonal axis (magnetic easy axis) in the insulating phase, whereas it is rather robust against the field perpendicular to this axis. These results demonstrate a metal-insulator crossover dominated by the orientation order of built-in Co3+ Ising spins embedded in the conductive Co3+/4+-O matrix lattice.

    DOI: 10.1103/PhysRevB.83.020401

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  • Thermal and electrical conduction properties of vertically aligned carbon nanotubes produced by water-assisted chemical vapor deposition 査読

    Atsuto Okamoto, Itaru Gurjishima, Takashi Inoue, Megumi Akoshima, Hidenori Miyagawa, Tomohito Nakano, Tetsuya Baba, Masaki Tanemura, Gendo Oomi

    CARBON   49 ( 1 )   294 - 298   2011年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:PERGAMON-ELSEVIER SCIENCE LTD  

    We present both thermal and electrical conduction properties of vertically aligned carbon nanotubes (VACNTs), synthesized by the water-assisted chemical vapor deposition method using Fe-Ti-O nanoparticles as catalyst Thermal diffusivity and electrical resistance of VACNTs have been measured by the laser flash method and direct current four-terminal method, respectively The VACNTs are found to have thermal diffusivities of the same order as isotropic graphite and the electrical characteristics of semiconductors The electrical resistance shows a T(-1/4) temperature dependence, which implies that the conduction of electrons is dominated by 3D Mott variable range hopping (C) 2010 Elsevier Ltd All rights reserved

    DOI: 10.1016/j.carbon.2010.09.024

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  • Effect of Pressure on Transport Properties of Heavy Fermion CePtSi2 査読

    Tomohito Nakano, Masashi Ohashi, Gendo Oomi, Kazuyuki Matsubayashi, Yoshiya Uwatoko

    JOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISM   23 ( 5 )   799 - 801   2010年7月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:SPRINGER  

    We measured the resistivity of heavy fermion CePtSi2 under pressure. At ambient pressure, CePtSi2 shows an antiferromagnetic (AF) transition at 2 K and a Fermi liquid like T-2 dependence ill resistivity below 1.5 K. With increasing pressure, the AF phase and T-2 dependence are suppressed. Above 1.4 GPa, a T linear dependence and pressure-induced superconductivity were found with the maximum T-c = 0.14 K at 1.7 GPa. Above 2 GPa, the T-2 dependence recovers just above T-c.

    DOI: 10.1007/s10948-010-0743-7

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  • Transport properties of the layered Rh oxide K0.49RhO2 査読

    S. Shibasaki, T. Nakano, I. Terasaki, K. Yubuta, T. Kajitani

    JOURNAL OF PHYSICS-CONDENSED MATTER   22 ( 11 )   115603-1-5   2010年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:IOP PUBLISHING LTD  

    We report measurements and analyses of resistivity, thermopower and the Hall coefficient of single-crystalline samples of the layered Rh oxide K0.49RhO2. The resistivity is proportional to the square of the temperature up to 300 K, and the thermopower is proportional to the temperature up to 140 K. The Hall coefficient increases linearly with the temperature above 100 K, which is ascribed to the triangular network of Rh in this compound. The different transport properties between NaxCoO2 and K0.49RhO2 are discussed on the basis of the different bandwidth between Co and Rh evaluated from the magnetotransport.

    DOI: 10.1088/0953-8984/22/11/115603

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  • Effect of pressure on the superconductivity and magnetism in HoNi2B2C 査読

    Masatoshi Nobori, Tomohito Nakano, Gendo Oomi, P. C. Canfield, B. K. Cho

    INTERNATIONAL CONFERENCE ON MAGNETISM (ICM 2009)   200 ( 1 )   012146-1-4   2010年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:IOP PUBLISHING LTD  

    The electrical resistivity of single crystalline HoNi2B2C has been measured under pressure up to 3.0 GPa. At ambient pressure, the resistivity shows sudden drop below T-c = 8.8 K, and becomes zero below 8.0 K. At 2.0 GPa, it drops below T-c = 8.1 K, becomes zero below 7.2 K, and shows a peak around 5.9 K due to the antiferromagnetic (AFM) order. Then it becomes zero again below 5.7 K. It is observed that the superconductivity is affected strongly by changing current density. T-c with 5.6 A/cm(2) decreases with increasing pressure. On the other hand, T-c increases when a current density is close to the critical current density J(c) = 63.9 A/cm(2) with increasing pressure up to 3.0 GPa.

    DOI: 10.1088/1742-6596/200/1/012146

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  • Novel thermoelectric properties of complex transition-metal oxides 査読

    Ichiro Terasaki, Manabu Iwakawa, Tomohito Nakano, Akira Tsukuda, Wataru Kobayashi

    DALTON TRANSACTIONS   39 ( 4 )   1005 - 1011   2010年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ROYAL SOC CHEMISTRY  

    We report how the thermopower of complex transition-metal oxides is susceptible to small changes in material parameters. In the A-site ordered perovskite oxide R(2/3)Cu(3)Ti(3.6)Ru(0.4)O(12), the thermopower changes from 15 to -100 mu VK(-1) at 300 K in going from R = La to Er. We associate this with the hybridization between Cu 3d and Ru 4d electrons, which depends on R. For stronger hybridization, the Cu 3d electrons become more itinerant leading to positive thermopower. In the A-site ordered perovskite cobalt oxide Sr(3)YCo(4)O(10.5), the spin state of the Co(3+) ions determines the magnitude of the thermopower, where partial isovalent substitution (Ca for Sr and Rh for Co) enhances the thermopower whilst keeping the resistivity intact. These substitutions stabilize the low spin state of the Co(3+) ions, which affects the thermopower through the entropy of the background for the carriers. We propose that the control of the magnetism plays a pivotal role in determining the thermopower in a certain class of complex oxides.

    DOI: 10.1039/b914661j

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  • Pressure effect on magnetic properties of a weak ferromagnet BaIrO3 査読

    Takanori Kida, Atsuko Senda, Shunsuke Yoshii, Masayuki Hagiwara, Tomohito Nakano, Ichiro Terasaki

    INTERNATIONAL CONFERENCE ON MAGNETISM (ICM 2009)   200   2010年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:IOP PUBLISHING LTD  

    We have investigated the pressure effect on magnetic properties of a weak itinerant ferromagnet BaIrO3, using a Cu-Be piston-cylinder type pressure cell. Under external pressure the ferromagnetic transition temperature T-c decreases linearly with pressure at a large rate of dT(c)/dP similar to -17 K/GPa. The critical exponent beta up to 0.86 GPa indicates the anomalous value (beta similar to 0.9) and is nearly pressure-independent. Anomalous pressure effects on conductivity and magnetism suggest the existence of a nontrivial coupling among charge, spin and lattice in this compound.

    DOI: 10.1088/1742-6596/200/1/012084

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  • Pressure-induced Quantum Phase Transition in Cr1-xVx Alloys

    Oomi G., Fuchizaki Y., Ohashi M., Nakano T., Uwatoko Y.

    Journal of the Magnetics Society of Japan   34 ( 3 )   263 - 266   2010年

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    記述言語:英語   出版者・発行元:The Magnetics Society of Japan  

    The electrical resistivities and Hall effect of Cr<sub>1-x</sub>V<sub>x</sub> alloys(x<0.04) were measured at high pressure. The Néel temperature T<sub>N</sub> of x = 0.015, 0.032 and 0.035 was found to disappear at corresponding P<sub>c</sub> of 5.6 GPa, 1.1 GPa and 0.7 GPa, respectively. The Hall coefficients of x = 0.032 and 0.035 demonstrated a discontinuous change around P<sub>c</sub>, which implies a quantum phase transition induced by high pressure. We found that the exponents in the power law of resistivity of x = 0.015 had an anomaly around P<sub>c</sub>, which means that the large quantum fluctuations affect the resistivity even at high temperature. A possibility of superconductivity is explored near P<sub>c</sub> for x = 0.032. A slight decrease in the ρ(T) curve was observed below 1 K at high pressure. The origins for that are briefly discussed.

    DOI: 10.3379/msjmag.1003R045

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    その他リンク: https://jlc.jst.go.jp/DN/JALC/00351380509?from=CiNii

  • Chemical and Physical Pressure Effects on the Magnetic and Transport Properties of the A-Site Ordered Perovskite Sr3YCo4O10.5 査読

    Shin Yoshida, Wataru Kobayashi, Tomohito Nakano, Ichiro Terasaki, Kazuyuki Matsubayashi, Yoshiya Uwatoko, Inga Grigoraviciute, Maarit Karppinen, Hisao Yamauchi

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   78 ( 9 )   094711-1-5 - 94711   2009年9月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:PHYSICAL SOC JAPAN  

    We have measured and analysed the magnetization, resistivity and thermopower of polycrystalline samples of Ca-subsituted Sr3YCo4O10.5. While the transition temperature and thermopower systematically decrease with increasing Ca content, the resistivity is nearly independent of the Ca-substitution level. We have furhter found that the substitution of Ca for Sr systematically decreases the lattice paremeters while maintaining the oxygen content unchanged, and have explained the Ca-substitution effects in terms of the spin-state transition induced by chemical pressure. We have also measured the magnetization of one of the samples under hydrostatic pressure. The result shows that the physical-pressure effect is semiquantitatively consistent with the chemical-pressure effect.

    DOI: 10.1143/JPSJ.78.094711

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  • Ferromagnetism and spin-glass transitions in the Heusler compounds Ru2-xFexCrSi 査読

    Masahiko Hiroi, Tsugumi Rokkaku, Kazuhisa Matsuda, Toru Hisamatsu, Iduru Shigeta, Masakazu Ito, Takuo Sakon, Keiichi Koyama, Kazuo Watanabe, Shintaro Nakamura, Tsutomu Nojima, Tomohito Nakano, Lin Chen, Tetsuya Fujiwara, Yoshiya Uwatoko, Hirotaka Manaka, Norio Terada

    PHYSICAL REVIEW B   79 ( 22 )   224423-1-10   2009年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:AMER PHYSICAL SOC  

    The results of a comprehensive study of the structural, magnetic, and magnetotransport properties of the Heusler compounds Ru2-xFexCrSi are presented. The Fe-rich compounds (x >= 1.5) exhibit a usual ferromagnetic transition. The Ru-rich compound (x=0.1) does not show ferromagnetism but exhibits a peak in magnetic susceptibility at T-N(*)=30 K. Nevertheless, specific-heat measurements show that there is no antiferromagnetic transition at T-N(*) nor at any other temperatures. With further decreasing temperature strong irreversible behavior occurs below a temperature T-g. It is proposed that these results can be interpreted as successive spin-glass transitions at T-N(*) and T-g. The compounds with intermediate x (=0.3 and 0.5) are found to be ferromagnetic. Both the saturation magnetization and the Curie temperature T-C increase with increasing x. However, being different from the Fe-rich compounds, hysteresis of the magnetization is observed and this suggests that the ferromagnetism has glassy character. In lower-temperature range fairly large negative magnetoresistance are observed. These results are suggestive of a magnetically inhomogeneous ferromagnetic state, that is, the formation of ferromagnetic clusters.

    DOI: 10.1103/PhysRevB.79.224423

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  • Pressure-induced superconductivity in the orthorhombic Kondo compound CePtSi2 査読

    Tomohito Nakano, Masashi Ohashi, Gendo Oomi, Kazuyuki Matsubayashi, Yoshiya Uwatoko

    PHYSICAL REVIEW B   79 ( 17 )   172507-1-4   2009年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:AMER PHYSICAL SOC  

    We have discovered a member of superconductivity induced by hydrostatic pressure in an antiferromagnetic (AF) concentrated Kondo compound CePtSi2 by measuring the resistivity and magnetoresistance. The AF transition temperature T-N of 1.8 K at ambient pressure is suppressed by pressure and disappears around 1.2 GPa. Above 1.4 GPa, a superconducting phase appears between 1.4 and 2.4 GPa, with the maximum T-c of 0.14 K at 1.7 GPa. The upper critical field of the superconductivity is evaluated to be 0.7 T, which is clearly larger than that of the Pauli limit predicted by the BCS theory.

    DOI: 10.1103/PhysRevB.79.172507

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  • Anisotropic Lattice Compression and Possible Valence Change in Kondo Compound CeAu_2Si_2

    Ohmura Mio, Sakai Kumiko, Nakano Tomohito, MIYAGAWA Hidenori, OOMI Gendo, SATO Isamu, KOMATSUBARA Takemi, AOKI Haruyoshi, MATSUMOTO Yuji, UWATOKO Yoshiya

    Journal of the Magnetics Society of Japan   33 ( 2 )   31 - 34   2009年3月

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    記述言語:英語   出版者・発行元:公益社団法人日本磁気学会  

    Lattice constants and crystal structure of tetragonal Kondo compound CeAu<sub>2</sub>Si<sub>2</sub> have been investigated at high pressure in order to examine pressure-induced change of crystal structure and gradual valence change of Ce atom. It is found that the lattice constants a and c decrease with increasing pressure without any discontinuity up to 13 GPa at room temperature. The bulk modulus <i>B</i><sub>0</sub> and its pressure derivative <i>B</i><sub>0</sub>' were obtained to be 112 GPa and 3.2. These values are comparable with other Kondo compounds. From the &rho;(T) curve at high pressure which does not change so much under high pressure, it is suggested that the valence of Ce changes sluggishly with pressure and the Kondo state of CeAu<sub>2</sub>Si<sub>2</sub> is very stable at high pressure.

    DOI: 10.3379/msjmag.0902LC8069

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  • Partial Gap of SDW in Ce(Ru1-xRhx)2Si2 査読

    T. Nakano, S. Murayama, G. Oomi

    Journal of the Magnetics Society of Japan   33 ( 2 )   35-37   2009年

  • Thermal expansion and magnetostriction of the concentrated Kondo compound CePtSi2 査読

    Tomohito Nakano, Gendo Oomi, Tetsuya Takeuchi

    25TH INTERNATIONAL CONFERENCE ON LOW TEMPERATURE PHYSICS (LT25), PART 4   150 ( 4 )   042139-1-4   2009年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:IOP PUBLISHING LTD  

    We measured the thermal expansion and magnetostriction of a polycrystalline concentrated Kondo compound CePtSi2, which has an orthorhombic CeNiGe2-type structure and the characteristic Kondo temperature T-K of 3 K. The linear thermal expansion dl/l decreases smoothly with decreasing temperature down to 2.5 K, and shows a rapid increase below 2 K due to antiferromagnetic ordering. The magnetostriction at 0.7 K shows an anomaly below 0.5 T, suggesting the disappearance of antiferromagnetic ordering.

    DOI: 10.1088/1742-6596/150/4/042139

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  • Hall effect in CeAl2 under high pressure 査読

    Hidenori Miyagawa, Masashi Ohashi, Tomohito Nakano, Gendo Oomi, Isamu Satoh, Takemi Komatsubara

    25TH INTERNATIONAL CONFERENCE ON LOW TEMPERATURE PHYSICS (LT25), PART 4   150 ( 4 )   042127-1-4   2009年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:IOP PUBLISHING LTD  

    We have measured the Hall effect of the single crystalline CeAl2 under high pressure up to 3 GPa. An anomalous Hall effect was observed at high pressures. The Hall coefficient R-H at 0.1 GPa is positive (R-H similar to 1.7 x 10(-9) m(3)/As). It decreases smoothly with increasing pressure below 2 GPa, but rapidly above 2 GPa. The sign of the Hall coefficient is found to change from positive to negative as pressure increases. These results suggest a pressure-induced crossover in the electronic state around 2.7 GPa.

    DOI: 10.1088/1742-6596/150/4/042127

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  • Nanoscale spin-dependent transport in a weak itinerant ferromagnet BaIrO3 査読

    Takanori Kida, Shunsuke Yoshii, Masayuki Hagiwara, Tomohito Nakano, Ichiro Terasaki

    25TH INTERNATIONAL CONFERENCE ON LOW TEMPERATURE PHYSICS (LT25), PART 2   150 ( 2 )   022037-1-4   2009年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:IOP PUBLISHING LTD  

    We have performed magnetoresistance (MR) measurements for a BaIrO3 single crystal. As the magnetic field changes from 0 T to 14 T and back to 0 T, the longitudinal MR at 1.5 K traces out a butterfly-shaped hysteresis curve and the sign of the MR ratio for the field-ascending sweep changes from negative to positive near 6 T. The MR ratios for field-ascending and descending sweeps overlap each other around 13 T. A large anisotropic magnetoresistance (AMR) ratio per mu B, (rho parallel to - rho perpendicular to) rho(0) similar to 400 %/mu B at 1.5 K, is obtained, where rho parallel to, rho perpendicular to, and rho(0) are the longitudinal resistivity, the transverse resistivity, and the zero- field resistivity. The MR effects are interpreted based on a spin valve model considering a novel crystal structure and a local magnetic-anisotropy related to the spin-orbit coupling of this compound.

    DOI: 10.1088/1742-6596/150/2/022037

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  • Resistivity of antiferromagnetic compounds Ce0.8La0.2(Ru 1-xRhx)2Si2 査読

    S. Ishiuchi, H. Naruse, S. Murayama, Y. Amakai, T. Nakano, Y. Uwatoko

    Journal of Physics: Conference Series   150 ( 4 )   042072-1-4   2009年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:Institute of Physics Publishing  

    We have measured the susceptibility χ and resistivity ρ on single-crystalline Ce0.8La0.2(Ru1-xRh x)2Si2 in directions parallel and perpendicular () to the c-axis. The χ for each Rh concentration increases with decreasing temperature, and then rapidly decreases for x ≤ 0.2 and x ≥ 0.8, indicating the AF transition at the Néel temperature TN. The ρ for x 0 shows a cusp at around TN 5.5 K, however, ρ indicates a broad maximum at higher temperature than TN and a rapid decrease at much lower temperature than TN, without evidence of a gap-type AF ordering. The ρ for x 0.2 indicates a clear cusp at about T N. Such sharp anomaly in ρ once disappears for x 0.6 and is again observed at TN for x ≥0.8 probably due to another type of the AF ordering. © 2009 IOP Publishing Ltd.

    DOI: 10.1088/1742-6596/150/4/042072

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  • 強相関酸化物BaIrO3 におけるモット絶縁体−電荷移動型絶縁体転移の圧力効果 査読

    中野智仁

    高圧力の科学と技術   18 ( 1 )   62-68 - 62   2008年

  • Nonlinear thermoelectric properties of layered cobalt oxides 査読

    Tomohito Nakano, Wataru Kobayashi, Ryoji Funahashi, Kenji Sugiura, Hiromichi Ohta, Kunihito Koumoto, Ichiro Terasaki

    PROCEEDINGS ICT 07: TWENTY-SIXTH INTERNATIONAL CONFERENCE ON THERMOELECTRICS   121 - 123   2008年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:IEEE  

    We synthesized whisker-crystal and thin-film samples of the layered cobalt oxide (Bi2Sr2O4)(x)CoO2 well known as a candidate of a thermoelectric material, and measured their resistivity, voltage-current characteristics and magnetoresistance with pulsed currents. Resistivity of the whisker sample with a small current density of 2 mA/cm(2) increases with decreasing temperature below 100 K, suggesting development of a pseudogap on the density of states. This increase is suppressed by a large current density of 110 A/cm(2). The nonlinear voltage-current characteristics are observed both for the whisker and thin-film samples. The negative magnetoresistance of the thin-film sample is suppressed by current density. These suggest that the density of states recovers owing to the suppression of the pseudogap by applying large current density.

    DOI: 10.1109/ICT.2007.4569438

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  • Unconventional critical behavior in the weak ferromagnet BaIrO3 査読

    T. Kida, A. Senda, S. Yoshii, M. Hagiwara, T. Takeuchi, T. Nakano, I. Terasaki

    EPL (Europhysics Letters)   84 ( 2 )   27004-1-4   2008年

  • Dielectric constant and ac conductivity of the layered cobalt oxide Bi(2)Sr(2)CoO(6+delta): A possible metal-dielectric composite made by self-organization of Co(2+) and Co(3+) ions 査読

    Y. Nagao, I. Terasaki, T. Nakano

    PHYSICAL REVIEW B   76 ( 14 )   144203-1-5   2007年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:AMER PHYSICAL SOC  

    The dielectric constant and ac conductivity of a single-crystal sample of the layered cobalt oxide Bi(2)Sr(2)CoO(6+delta) were measured along the c axis from 10(2) to 10(9) Hz from 110 to 300 K, the frequency dependence of which is found to be similar to that for metal-dielectric composites. The ac conductivity obeys the same scaling relation as that of disordered solids, which is quantitatively consistent with a theoretical calculation for spatially inhomogeneous conductive medium. This implies that the charge carrier on the Co(2+) site is electronically segregated in the CoO(2) plane. This compound can work as a metal-dielectric composite even in a form of single crystal, a possible mechanism of which is suggested on the basis of the electronic configuration of Co ions.

    DOI: 10.1103/PhysRevB.76.144203

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  • Positive and negative pressure effects on the magnetic ordering and the Kondo effect in the compound Ce2RhSi3 査読

    T. Nakano, Kausik Sengupta, Sudhindra Rayaprol, M. Hedo, Y. Uwatoko, E. V. Sampathkumaran

    JOURNAL OF PHYSICS-CONDENSED MATTER   19 ( 32 )   326205-1-13   2007年8月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:IOP PUBLISHING LTD  

    The competition between magnetic ordering and the Kondo effect in Ce2RhSi3, ordering antiferromagnetically at 7 K, is investigated by the measurements of magnetization, heat capacity and electrical resistivity on the solid solutions, Ce2-xLaxRhSi3, Ce2-yYyRhSi3, and Ce2RhSi3-zGez, as well as by high-pressure studies on this compound. The trends in the Kondo and Neel temperature variations among these alloys are compared to infer the roles of unit-cell volume and electronic structure changes. On the basis of the results, we infer that this compound lies at the peak of Doniach's magnetic phase diagram. The high-pressure electrical resistivity data indicate that the quantum critical point for this compound is in the vicinity of 4 GPa.

    DOI: 10.1088/0953-8984/19/32/326205

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  • Specific heat of superstoichiometric samarium dihydride (SmH2+δ) 査読

    O. Nakamura, Y. Tanaka, K. Nakazawa, T. Nakano, M. Sakai, S. Orimoe, Y. Uwatoko

    Journal of Magnetism and Magnetic Materials   310 ( 2 )   E65 - E67   2007年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

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  • Chemical pressure effect in the heavy fermion compound Ce1yLay(Ru0.85Rh0.15)(2)Si-2 査読

    Tsuyoshi Horii, Satomi Shimada, Tomohito Nakano, Shigeyuki Murayama, Hideaki Takano, Masato Hedo, Yoshiya Uwatoko

    JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS   310 ( 2 )   313 - 315   2007年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE BV  

    We have measured the susceptibility and resistivity on single-crystalline Ce1-yLa(y)(Ru0.85Rh0.15)(2)Si-2 along the tetragonal c-axis. The susceptibility increases with decreasing temperature, and then rapidly decreases, indicating the AF transition in each La concentration y. The resistivity also shows an anomaly in each La concentration y at around the T-N. For y <= 0.1, we observe a jump in resistivity just below TN as is seen for Ce( Ru0.85Rh0.15)(2)Si-2. This is interpreted in terms of the gap opening on the Fermi- surface along the c-axis. However, for y >= 0.2 the resistivity shows a downward bend at TN. These experimental facts suggest that the crossover from the spin density wave (SDW) with the gap opening to the localized AF order occurs at around y = 0.1. (c) 2006 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.jmmm.2006.10.013

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  • Magnetic field dependence of resistivity for Ce0.8La0.2(Ru0.85Rh0.15)(2)Si-2 査読

    Tomohito Nakano, Satomi Shimada, Shigeyuki Murayama, Masato Hedo, Yoshiya Uwatoko, Ichiro Terasaki

    JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS   310 ( 2 )   402 - 404   2007年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER  

    We measured resistivity of heavy fermion antiferromagnetic Ce0.8La0.2(Ru0.85Rh0.15)(2)Si-2 in magneticfield up to 4T. The resistivity for Ce0.8La0.2(Ru0.85Rh0.15)(2)Si-2 shows a downward bend at T-N, indicating an antiferromagnetic order with a local moment character. For 1T <= B <= 1.75 T, it shows a jump at T-N as in the case of Ce(Ru0.85Rh0.15)(2)Si-2, where the downward bend was no longer observed. This result indicates that instead of the local moment character, a gap is opened on the fermi surface by magnetic field. For B > 1.75 T, the resistivity is proportional to T-2 without any anomalies, suggesting that the developed gap closes again for B > 1.75 T, and the Fermi liquid state is induced by magnetic field. (c) 2006 Published by Elsevier B.V.

    DOI: 10.1016/j.jmmm.2006.10.081

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  • Nonlinear thermoelectric properties of layered cobalt oxides 査読

    Tomohito Nakano, Wataru Kobayashi, Ryoji Funahashi, Kenji Sugiura, Hiromichi Ohta, Kunihito Koumoto, Ichiro Terasaki

    International Conference on Thermoelectrics, ICT, Proceedings   26th   121 - 123   2007年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:IEEE  

    We synthesized whisker-crystal and thin-film samples of the layered cobalt oxide (Bi2Sr2O4)xCoO2 well known as a candidate of a thermoelectric material, and measured their resistivity, voltage-current characteristics and magnetoresistance with pulsed currents. Resistivity of the whisker sample with a small current density of 2 mA/cm2 increases with decreasing temperature below 100 K, suggesting development of a pseudogap on the density of states. This increase is suppressed by a large current density of 110 A/cm2. The nonlinear voltage-current characteristics are observed both for the whisker and thin-film samples. The negative magnetoresistance of the thin-film sample is suppressed by current density. These suggest that the density of states recovers owing to the suppression of the pseudogap by applying large current density. © 2008 IEEE.

    DOI: 10.1109/ICT.2007.4569438

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  • Thermal expansion of CePt3Si under high pressure 査読

    Masashi Ohashi, Gendo Oomi, Tomohito Nakano, Yoshlya Uwatoko

    PHYSICA B-CONDENSED MATTER   378-80   379 - 380   2006年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER  

    We have carried out the thermal expansion measurement of CePt3Si under pressure Lip to 3.0 GPa. It is found that a maximum in 1(T) is observed and the temperature showing maximum T increases significantly with increasing pressure having a coefficient partial derivative T-m/partial derivative P = 4 K/GPa. Assuming that T-m corresponds to the Kondo temperature T-K, partial derivative T-K/partial derivative P is smaller than that of typical heavy fermion compounds such as CeCu6. It comes from the fact that two kinds of interactions, the RKKY interaction and the Kondo effect, are competing each other. (c) 2006 Published by Elsevier B.V.

    DOI: 10.1016/j.physb.2006.01.134

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  • Giant nonlinear conduction and thyristor-like negative differential resistance in BaIrO3 single crystals 査読

    Tomohito Nakano, Ichiro Terasaki

    PHYSICAL REVIEW B   73 ( 19 )   2006年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:AMER PHYSICAL SOC  

    We synthesized single-crystalline samples of monoclinic BaIrO3 using a molten flux method, and measured their magnetization, resistivity, Seebeck coefficient, and nonlinear voltage-current characteristics. The magnetization rapidly increases below the ferromagnetic transition temperature T-C of 180 K, where the resistivity concomitantly shows a hump-type anomaly, followed by a sharp increase below 30 K. The Seebeck coefficient suddenly increases below T-C, and shows linear temperature dependence below 50 K. A most striking feature of this compound is that the anomalously giant nonlinear conduction is observed below 30 K, where a small current density of 20 A/cm(2) dramatically suppresses the sharp increase in resistivity to induce a metallic conduction down to 4 K.

    DOI: 10.1103/PhysRevB.73.195106

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  • Thermal expansion and magnetostriction in YbInCu4 under high pressure 査読

    Y. Saiga, T. Nakano, M. Hedo, Y. Uwatoko, M. Kosaka, N. Mori, T. Goto, K. Yoshimura

    LOW TEMPERATURE PHYSICS, PTS A AND B   850   1177 - +   2006年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:AMER INST PHYSICS  

    YbInCu4 undergoes a first-order isostructural valence transition at T-V = 42K, which is accompanied by a 0.5% volume increase due to cooling. In order to elucidate the valence transition, both the linear thermal expansion and magnetostriction, Delta L/L, of a YbInCu4 single crystal were measured using strain gauges under high pressures of up to 3.0 GPa and a magnetic field of up to 18 T. The abrupt volume change during the valence transition was confirmed to decrease linearly with T-V under a high pressure. It was also observed that T-V was suppressed upon application of a magnetic field. On the basis of the results, we have established a T-P-B phase diagram for the first-order valence transition in YbInCu4.

    DOI: 10.1063/1.2355123

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  • Thermoelectronic properties of the strongly-correlated oxide BaIrO3 査読

    Tomohito Nakano, Ichiro Terasaki

    ICT'06: XXV INTERNATIONAL CONFERENCE ON THERMOELECTRICS, PROCEEDINGS   25th(Pt. 2)   473 - +   2006年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:IEEE  

    We synthesized polycrystalline samples of Ba1-xSrxIrO3 (0 <= x <= 0.2) using a solid-state reaction method, and measured their magnetization, resistivity, and thermopower. The thermopower of BaIrO3 slightly increases with decreasing temperature above T-C, and is suddenly enhanced below T-C = 180 K due to the pseudogap in the density of states. At 75 K, it reaches a maximum value of 230 mu V/K. With increasing Sr concentration, the thermopower systematically decreases, accompanied by a slight decrease of T-C. For x = 0.2, the maximum value of the thermopower and T-C are 50 mu V/K and 173 K, respectively. These results indicate that the gap is suppressed by chemical pressure due to the substitution of Sr for Ba.

    DOI: 10.1109/ICT.2006.331318

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  • Chemical pressure effect for the SDW phase in heavy fermion Ce(Ru0.85Rh0.15)(2)Si-2 compound 査読

    T Nakano, H Yamashiro, K Fujita, S Murayama

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   74 ( 5 )   1602 - 1608   2005年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:PHYSICAL SOC JAPAN  

    Susceptibility measurements have been performed on polycrystalline samples Ce1-xRy(Ru0.85Rh0.15)(2)(-) Si-2 (R = Sc, La) in order to clarify the chemical pressure effect for the SDW in the heavy fermion Ce(Ru0.85Rh0.15)(2)Si-2. Lattice parameters a and c both decrease with increasing Sc concentration and increase with increasing La concentration. For Ce1-yScy(Ru0.85Rh0.15)(2)Si-2 system, the Neel temperature T-N decreases with increasing Sc concentration and disappears for y &gt;= 0.2. We observed the Curie-Weiss law in the susceptibility at high temperature and a tendency of the saturation in the low temperature susceptibility. The tendency of the saturation and the Weiss temperature Theta determined from the high temperature susceptibility increase with increasing Sc concentration. These facts can be explained through the increase of the c-f hybridization and itinerancy of the f electron. For Ce1-yLay(Ru-0.85-Rh-0.15)(2)Si-2 system, the T-N slightly decreases with increasing La concentration and the tendency of the saturation becomes weaker with increasing y and is no more observed down to T-N for y &gt; 0. 15. The Theta rapidly decreases with increasing La concentration and becomes almost zero for 37 &gt; 0.15. These facts suggest that the c-f hybridization becomes weak with increasing y and that the itinerant AF phase for y &lt; 0. 15 is replaced by the AF phase with the localized moment for y &gt; 0. 15. The Kondo temperature T-K estimated from Theta is scaled by a single proportional function of the lattice parameter c in both cases for the Sc and La substitution.

    DOI: 10.1143/JPSJ.74.1602

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  • Magnetic phase transitions in PrCU2Ge2 査読

    T Shigeoka, K Hirata, T Nakano, Y Uwatokob

    PHYSICA B-CONDENSED MATTER   359   923 - 925   2005年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE BV  

    Measurements of electrical resistivity and specific heat have been performed on the tetragonal ternary compound PrCu2Ge2. The resistivity shows a inflection and a sharp drop with a hysteresis around 14 and 4K where the specific heat also shows lambda-type anomaly and a jump, respectively, which are associated with magnetic transitions. From the low temperature specific heat, the electronic specific heat coefficient y = 13 mJ/mol K-2 and the hyperfine field H-h = 3000 kOe are estimated. The magnetic entropy indicates the existence of a doublet ground level and a doublet first excited level. (c) 2005 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.physb.2005.01.264

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  • Electrical resistivity, specific heat and magnetic susceptibility of tetragonal CeGe1.66 査読

    T Nakano, M Hedo, Y Uwatoko

    PHYSICA B-CONDENSED MATTER   359   284 - 286   2005年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE BV  

    Magnetic susceptibility, specific heat and electrical resistivity measurements have been carried out on polycrystalline specimens of CeGe1.66, forming in a tetragonal structure, which is derived from CeGe2 by creation of vacancies at the Ge site. A shoulder in susceptibility, a jump in specific heat and an inflection in resisitivity attributable to magnetic ordering are observed at 6.7 K. Furthermore, a rapid increase in susceptibility, another jump in specific heat and a rapid decrease in the resistivity due to the ferromagnetic ordering are observed below (T-C =) 5.3 K. The electronic specific heat coefficient gamma is estimated to be about mJ/molK(2) (c) 2005 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.physb.2005.01.105

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  • Resistivity of antiferromagnetic Ce0.8La0.2(Ru0.85Rh0.15)(2)Si-2 under pressure 査読

    A Isoda, S Shimada, Y Kanda, S Murayama, H Takano, T Nakano, M Hedo, Y Uwatoko

    PHYSICA B-CONDENSED MATTER   359   169 - 171   2005年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE BV  

    We have measured the resistivity of antiferromagnetic Ce0.8La0.2(Ru0.85Rh0.15)(2)Si-2 along the tetragonal c-axis under various hydrostatic pressures. At P = 0 GPa we observe no gap-type jump in the resistivity at T-N as has been observed for Ce(Ru0.85Rh0.15)(2)Si-2 at the spin density-wave (SDW) transition temperature, but rather downward bend with decreasing temperature. At P &gt;= 0.48GPa we observe the gap-type jump just below TN. These facts suggest the recovery of the gap opening due to the Fermi-surface nesting by pressure from a conventional localized antiferromagnetic state. (c) 2005 Elsevier B.V. All rights reserved.

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  • Electrical resistivity and tunneling anomalies in CeCuAs2 査読

    EV Sampathkumaran, T Ekino, RA Ribeiro, K Sengupta, T Nakano, M Hedo, N Fujiwara, M Abliz, Y Uwatoko, S Rayaprol, T Doert, JPF Jernetio

    PHYSICA B-CONDENSED MATTER   359   108 - 110   2005年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE BV  

    The compound CeCuAs2 is found to exhibit negative temperature (T) coefficient of electrical resistivity (rho) under ambient pressure conditions in the entire T-range of investigation (45 mK-300 K), even in the presence of high magnetic fields. Preliminary tunneling spectroscopic measurements indicate the existence of a psuedo-gap at least at low temperatures, thereby implying that this compound could be classified as a Kondo semi-conductor, though rho(T) interestingly is not found to be of an activated type. (c) 2005 Elsevier B.V. All rights reserved.

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  • Pressure-induced change in temperature coefficient of electrical resistivity in CeCuAS(2) 査読

    M Abliz, T Nakano, EV Sampathkumaran, JPF Jemetio, T Doert, M Hedo, Y Uwatoko

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   74 ( 2 )   508 - 510   2005年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:PHYSICAL SOC JAPAN  

    The intermetallic compound, CeCuAs2, crystallizing in a HfCuSi2-type tetragonal structure, has recently been shown to exhibit a negative temperature (T) coefficient of electrical resistivity (p) in the entire T-range of investigation (45 mK to 300 K). Here, we report that an application of external pressure (up to IOGPa) profoundly influences p(T) behavior, reversing the sign of drho/dT at pressures above 8 GPa, presumably arising from increasing 4f hybridization or changes in pseudo-gap. Such a behavior is uncommon among Ce-based intermetallic compounds.

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  • High pressure effects on the electrical resist ivity behavior of the Kondo lattice, YbPd2Si2 査読

    T Nakano, M Hedo, Y Uwatoko, EV Sampathkumaran

    SOLID STATE COMMUNICATIONS   132 ( 5 )   325 - 328   2004年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:PERGAMON-ELSEVIER SCIENCE LTD  

    We report the influence of external high-pressure (P up to 8 GPa) on the temperature (T) dependence of electrical resistivity (rho) of a Yb-based Kondo lattice, YbPd2Si2, which does not undergo magnetic ordering under ambient pressure condition. There are qualitative changes in the rho(T) behavior due to the application of external pressure. While rho is found to vary quadratically below 15 K (down to 45 mK) characteristic of Fermi-liquids, a drop is observed below 0.5 K for P = 1 GPa, signaling the onset of magnetic ordering of Yb ions with the application of P. The Tat which this fall occurs goes through a peak as a function of P (8 K for P = 2 GPa and about 5 K at high pressures), mimicking Doniach's magnetic phase diagram. We infer that this compound is one of the very few Yb-based stoichiometric materials, in which one can traverse from valence fluctuation to magnetic ordering by the application of external pressure. (C) 2004 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.ssc.2004.07.064

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  • Magnetic, electrical resistivity, heat-capacity, and thermopower anomalies in CeCuAs2 査読

    K Sengupta, EV Sampathkumaran, T Nakano, M Hedo, M Abliz, N Fujiwara, Y Uwatoko, S Rayaprol, K Shigetoh, T Takabatake, T Doert, JPF Jemetio

    PHYSICAL REVIEW B   70 ( 6 )   2004年8月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:AMER PHYSICAL SOC  

    The results of magnetic susceptibility (chi), electrical resistivity (rho), heat-capacity (C), and thermopower (S) measurements on CeCuAs2, forming in the ZrCuSi2-type tetragonal structure, are reported. Our investigations reveal that Ce is trivalent and there is no clear evidence for long range magnetic ordering down to 45 mK. The rho behavior is notable in the sense that (i) the temperature (T)-coefficient of rho is negative in the entire range of measurement (45 mK to 300 K) with large values of rho, while the S behavior is typical of metallic Kondo lattices, and (ii) rho is proportional to T-0.6 at low temperatures, without any influence on the exponent by the application of a magnetic field, which does not seem to classify this compound into hither-to-known non-Fermi liquid (NFL) systems. In contrast to the logarithmic increase known for NFL systems, C/T measured down to 0.5 K exhibits a fall below 2 K. The observed properties of this compound are unusual among Ce systems.

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  • Crystal structure and structural transition caused by charge-transfer phase transition for iron mixed-valence complex (n-C3H7)(4)N[(FeFeIII)-Fe-II(dto)(3)] (dto = C2O2S2) 査読

    M Itoi, A Taira, M Enomoto, N Matsushita, N Kojima, Y Kobayashi, K Asai, K Koyama, T Nakano, Y Uwatoko, J Yamaura

    SOLID STATE COMMUNICATIONS   130 ( 6 )   415 - 420   2004年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:PERGAMON-ELSEVIER SCIENCE LTD  

    (n-C3H7)(4)N[(FeFeIII)-Fe-II(dto)(3)] shows a new type of first order phase transition called chare-transfer phase transition around 120 K. where the charge transfer between Fe-II and Fe-III occurs reversibly. Recently, we have succeeded in obtaining single crystals of the title complex and determined the crystal Structure at room temperature. Crystal data: space group P6(3), a = 10.0618(5) Angstrom. c = 16.0424(7) Angstrom. V = 1406.54(12)Angstrom, Z = 2. Moreover. we have investigated the structural transition caused by the charge-transfer phase transition by means of powder X-ray diffraction measurement. When the temperature is decreased. the a-axis. which corresponds to the hexagonal ring size in two-dimensional honeycomb network structure of [Fe-II Fe-III(dto)(3)](infinity). contracts by 0.1 Angstrom at the charge-transfer transition temperature (T-CT) while the c-axis. perpendicular to the honeycomb network layer. elongates by 0.1 Angstrom at T-CT. Consequently, when the temperature is decreased, the unit cell volume decreases without noticeable anomaly around T-CT, which is responsible for the quite sniall vibrational contribution to the entropy change. compared with usual spin crossover transition. Thus, the charge-transfer phase transition around 120 K for (n-C3H7)(4)N[Fe-II Fe-III(dto)(3)] is regarded as spin entropy driven phase transition. (C) 2004 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.ssc.2004.02.034

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  • Pressure effect and temperature dependence of lattice constants for Ce(Ru0.85Rh0.15)(2)Si-2 査読

    Kazuko Koyama, Tomohito Nakano, Masato Hedo, Yoshiya Uwatoko, Shigeyuki Murayama

    JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS   272 ( 2 )   E109 - E110   2004年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE BV  

    X-ray powder diffraction has been studied on Ce(Ru0.85Rh0.15)(2)Si-2 between 300 and 4 K under pressure up to 32 GPa with a diamond anvil cell, and the lattice constants and the bulk modulus have been obtained. The bulk modulus shows a rapid drop between 100 and 50 K; when the temperature decreases from 300 to 4 K: This tendency is most likely attributed to Kondo effect and/or a sign of a spin density wave. (C) 2003 Elsevier B. V. All rights reserved.

    DOI: 10.1016/j.jmmm.2003.11.217

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  • Resistivity of Ce(Ru1-xRhx)(2)Si-2 under pressure 査読

    Tomohito Nakano, Ayano Isoda, Masato Hedo, Yoshiya Uwatoko, Shigeyuki Murayama

    JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS   272   E85 - E86   2004年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE BV  

    Resistivity measurement on single-srystalline Ce(Ru0.85Rh0.15)(2)Si-2 sample, which shows a spin-density-wave (SDW) transition at a Neel temperature T-N = 5.5 K; has been performed with excitation current parallel to tetragonal a-axis under hydrostatic pressure. Resistivity shows an inflection around T-N, although a hump-type anomaly is not observed as in the case for the c-axis. This in. ection shifts to lower temperature with increasing pressure. This result indicates that the gap of Fermi surface is open only along the c-axis direction up to P-c. On the other hand, the shoulder corresponding to the Kondo effect exists around T similar to 20 K; and shifts to higher temperature with increasing pressure, indicating an increase of T-K: This is consistent with the result for the c-axis. (C) 2004 Elsevier B. V. All rights reserved.

    DOI: 10.1016/j.jmmm.2003.11.314

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  • Magnetic, electrical resistivity, heat-capacity, and thermopower anomalies in CeCuAs2 査読

    K. Sengupta, E. V. Sampathkumaran, T. Nakano, M. Hedo, M. Abliz, N. Fujiwara, Y. Uwatoko, S. Rayaprol, K. Shigetoh, T. Takabatake, T. Doert, J. P. F. Jeme

    Physical Review B   70 ( 6 )   064406-1-5   2004年

  • Resistivity of Ce(Ru0.85Rh0.15)(2)Si-2 under pressure 査読

    T Nakano, K Fujita, S Murayama, K Hoshi, M Hedo, Y Uwatoko

    PHYSICA B-CONDENSED MATTER   329   532 - 534   2003年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE BV  

    Resistivity measurement on single-crystalline Ce(Ru0.85Rh0.15)(2)Si-2 sample which shows a spin-density-wave (SDW) transition at a Neel temperature T-N = 5.5 K has been performed under hydrostatic pressure. A hump-type jump in resistivity due to the SDW transition shifts to lower temperature with increasing pressure, and finally disappears above P = 0.5 GPa. The ratio of gapped part of the Fermi-surface along the c-axis is estimated as similar to0.45 for P = 0 GPa and almost pressure independent. (C) 2003 Published by Elsevier Science B.V.

    DOI: 10.1016/S0921-4526(02)02374-8

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  • Specific heat of Ce(Ru1-xRhx)(2)Si-2 at around the SDW phase 査読

    T Nakano, K Fujita, Y Ohmori, S Murayama, K Hoshi, H Amitsuka, Y Onuki, M Ocio, J Hammann

    PHYSICA B-CONDENSED MATTER   312   440 - 442   2002年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE BV  

    Specific heat measurements have been performed on single-crystalline Ce(Ru1-xRhx)(2)Si-2 (x = 0.15,0.35) in various magnetic fields parallel to the c-axis. For x = 0.15, the magnetic specific heat C,; shows a jump due to the spin density wave for B&lt;B-c (similar to3.6T). For B-c&lt;B&lt;6T, C-mag/T increases with decreasing temperature with a non-Fermi liquid (NFL) behavior. The paramagnetic Fermi liquid (FL) behavior was observed for B &gt; 6T. For x = 0.35, C-mag/T shows the NFL behavior for B&lt;6T and the FL behavior for B&gt;6T. (C) 2002 Elsevier Science B.V. All rights reserved.

    DOI: 10.1016/S0921-4526(01)01358-8

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  • Resistivity and susceptibility of heavy-fermion Ce(Ru1-xPdx)(2)Si-2 査読

    S Murayama, T Nakano, Y Ohmori, K Hatano, K Hoshi

    PHYSICA B-CONDENSED MATTER   312   445 - 447   2002年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE BV  

    Temperature dependence of the resistivity and susceptibility on single-crystalline Ce(Ru1-xPdx)(2)Si-2, x=0.08 has been measured in directions parallel and perpendicular to the c-axis in various magnetic fields along the c-axis. These results show clear anomalies at around T-N only in the parallel direction and suggest partial gapping of the Fermi surface along the c-axis due to a uniaxial Fermi-surface nesting. (C) 2002 Elsevier Science B.V. All rights reserved.

    DOI: 10.1016/S0921-4526(01)01165-6

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  • Anomalous magnetic structures and properties in strongly correlated or competing metal and alloys 査読

    S. Murayama, H. Takano, T. Nakano, Y. Ohmori, M. Ishida, T. Matusmura, K. Hoshi

    Proceedings 2001-1 Symposium “Muon Science 2001”, ed. Y. Miyake, K. Nishiyama and K. Nagamine   124-131   2001年

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  • Magnetic properties of the heavy-fermion Ce(Ru1-xRhx)(2) Si-2 at the critical Rh concentration of the SDW phase 査読

    T Nakano, Y Ohmori, S Murayama, K Hoshi, Y Onuki

    PHYSICA B   281   346 - 348   2000年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE BV  

    The resistivity and the susceptibility for Ce(Ru1-xRhx)(2)Si-2, x = 0.03,0.33 and 0.35 have been measured. For x = 0.33, an anomaly in the resistivity due to antiferromagnetic (AF) transition was observed and the paramagnetic Fermi liquid behaviors were observed in held B greater than or equal to 1 T. For x = 0.35, the resistivity shows disappearance of the anomaly due to the AF transition and follows A T-n. n = 1.4 at B = 0 T and n = 1.8 at B = 4 T. Finally, the B-x magnetic phase diagram has been proposed. (C) 2000 Published by Elsevier Science B.V. All rights reserved.

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  • Magnetic properties of heavy-fermion Ce(Ru1-xPdx)(2)Si-2 査読

    S Murayama, C Sekine, S Yotsuya, T Nakano, Y Ohmori, K Hoshi, Y Tsuchiya, T Osakabe

    PHYSICA B   281   343 - 345   2000年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE BV  

    Magnetic structure of single-crystalline Ce(Ru1-xPdx)(2)Si-2, x = 0.025 has been measured by neutron diffraction. The magnetic moment is oriented and modulated along the c-axis with incommensurate wave vector tau = (0,0,0.368). At 1.4 K the moment was estimated to be about 0.15 mu(B). Temperature dependence of the specific heat on polycrystalline Ce(Ru1-xPdx)(2)Si-2, x = 0.05 has also been measured in various magnetic fields, suggesting partial gapping of the Fermi surface due to a Fermi-surface nesting. (C) 2000 Elsevier Science B.V. All rights reserved.

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  • Spin-density-wave transition and mSR in the heavy-fermion Ce(Ru,T)2Si2, T = Rh, Pd. 査読

    S. Murayama, C. Sekine, T. Nakano, Y. Tsuchiya, K. Nishiyama, K. Nagamine, Y. Onuki

    JJAP Series   11   15-17   1999年

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書籍等出版物

  • 25. Thermal and electronic properties of rare earth compounds at high pressure

    Y. Uwatoko, I. Umehara, M. Ohashi, T. Nakano, G. Oomi( 担当: 共著 ,  範囲: Vol. 42 Chap. 252)

    Elsevier Science BV  2012年 

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MISC

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講演・口頭発表等

  • Pressure-induced superconductor CePtSi2 招待 国際会議

    T. Nakano, N. Ohya, N. Kase, N. Takeda, K. Matsubayashi, Y. Uwatoko, M. Ohashi, G. Oomi

    1th Prague Colloquium on f-Electron Systems (PCFES 2014)  2014年7月 

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    記述言語:英語   会議種別:口頭発表(招待・特別)  

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  • Low-temperature properties of CePtSi2 in magnetic field 招待 国際会議

    T. Nakano, S. Onuki, N. Takeda

    Ninth International Conference on New Theories, Discoveries, and Applications of Superconductors and Related Materials  2012年10月 

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    記述言語:英語   会議種別:口頭発表(招待・特別)  

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  • Pressure induced physical phenomena of Ce and Yb Compounds 招待 国際会議

    Y. Uwatoko, T. Nakano, M. Matsubayashi, Y. Saiga, G. Oomi

    26th Rare Earth Research Conference  2011年6月 

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    記述言語:英語   会議種別:口頭発表(招待・特別)  

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  • Low Temperature Properties of Pressure Induced Superconductor CePtSi2 招待 国際会議

    T. Nakano, S. Onuki, N. Takeda

    Eighth International Conference on New Theories, Discoveries and Applications of Superconductors and Related Materials  2011年6月 

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    記述言語:英語   会議種別:口頭発表(招待・特別)  

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  • Transport Properties Of Heavy Fermion CePtSi2 招待 国際会議

    T. Nakano, M. Ohashi, G. Oomi, K. Matsubayashi, Y. Uwatoko

    Seventh International Conference on New Theories, Discoveries and Applications of Superconductors and Related Materials  2009年5月 

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    記述言語:英語   会議種別:口頭発表(招待・特別)  

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共同研究・競争的資金等の研究

  • マルチサイトCe化合物における電子状態の独立制御

    研究課題/領域番号:22K04669

    2022年4月 - 2026年3月

    制度名:科学研究費助成事業 基盤研究(C)

    研究種目:基盤研究(C)

    提供機関:日本学術振興会

    中野 智仁

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    配分額:4030000円 ( 直接経費:3100000円 、 間接経費:930000円 )

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  • 希土類化合物における価数揺らぎを媒介とした新規超伝導と 異常電子状態の研究(国際共同研究強化)

    研究課題/領域番号:15KK0156

    2016年 - 2018年

    制度名:科学研究費助成事業 国際共同研究加速基金(国際共同研究強化)

    研究種目:国際共同研究加速基金(国際共同研究強化)

    提供機関:日本学術振興会

    中野 智仁, 武田 直也

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    配分額:14040000円 ( 直接経費:10800000円 、 間接経費:3240000円 )

    本研究はスピン,軌道,および価数の自由度をもった希土類元素を含むf電子-重い電子系化合物において,新規物質探索から物性測定を行い, 価数揺らぎによる新規超伝導および新規電子状態の探索, そしてその発現機構の詳細と普遍性を明らかにすることを目的とし, カレル大学物理数学部に半年間滞在し純良試料作成および物性測定を行った。主な研究成果を以下に示す。 (1) マルチサイトCe化合物CePtGe2における重い電子状態と反強磁性の共存状態および, (2) SmPtSi2における2段階転移を明らかにした。

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  • 希土類化合物における価数揺らぎを媒介とした新規超伝導と 異常電子状態の研究

    研究課題/領域番号:15K05162

    2015年4月 - 2018年3月

    制度名:科学研究費助成事業 基盤研究(C)

    研究種目:基盤研究(C)

    提供機関:日本学術振興会

    中野 智仁

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    配分額:4680000円 ( 直接経費:3600000円 、 間接経費:1080000円 )

    本研究では価数などの揺らぎを媒介とした新奇の超伝導や状態の探索とその起源の解明のため,圧力や元素置換によってこれらが実現する可能性がある化合物を探索し,その物性を測定を行った。以下に主な結果を示す。(1) 圧力誘起超伝導体CePtSi2単結晶試料を用いた測定から詳細な圧力相図を作成した。(2) CePtGe2多結晶および単結晶試料を作成し3.8 Kで反強磁性転移をすることを明らかにした。(3) SmPtSi2多結晶および多結晶および単結晶試料を作成し,2段階の秩序を示すことを明らかにした。

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  • 圧力誘起超伝導,巨大磁気抵抗および異方的近藤散乱を示すセリウム化合物の物性研究

    研究課題/領域番号:24740226

    2012年4月 - 2014年3月

    制度名:科学研究費助成事業 若手研究(B)

    研究種目:若手研究(B)

    提供機関:日本学術振興会

    中野 智仁

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    配分額:4420000円 ( 直接経費:3400000円 、 間接経費:1020000円 )

    本研究は申請者らが発見したCePtSi2における圧力誘起超伝導, 巨大磁気抵抗および異方的な近藤散乱の発現機構を解明するため,CePtSi2およびその関連物質のフラックス法による純良単結晶試料を育成し,圧力下における輸送特性測定を行い,主に以下を明らかにした。以下に主な結果を示す。(1)各結晶軸に対して輸送特性を明らかにし,圧力誘起超伝導が価数揺らぎの影響を受けていることを示唆した。(2) 磁化の異方性に対応して,c軸方向の磁気抵抗効果が強大であるのに対し,b軸方向では極端に小さいことを明らかにした。これは異方的な近藤散乱に起因していると考えられる。

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担当経験のある授業科目(researchmap)

担当経験のある授業科目

  • エンジニアのためのデータサイエンス入門(化学材料分野)

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