Updated on 2025/10/29

写真a

 
NEMOTO Yuichi
 
Organization
Academic Assembly Institute of Science and Technology Fundamental Sciences Associate Professor
Faculty of Science Associate Professor
Graduate School of Science and Technology Fundamental Sciences Associate Professor
Title
Associate Professor
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Degree

  • 博士(理学) ( 1998.3   東北大学 )

Research Interests

  • Ultrasound measurements

  • Strongly correlated electron systems

  • Electric quadrupoles

  • Solid state physics

  • Superconductivity

  • Charge orderings

  • Rare-earth compounds

  • Iron-based superconductors

  • Low-temperature physics

  • Vacancy

  • Elastic constants

  • Surface acoustic waves

  • Orbital orderings

  • Rattling

  • Semiconductor

  • Magnetism

Research Areas

  • Natural Science / Magnetism, superconductivity and strongly correlated systems

  • Natural Science / Semiconductors, optical properties of condensed matter and atomic physics

Research History (researchmap)

  • Niigata University   Faculty of Science Department of Physics   Associate Professor

    2010.4

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  • Niigata University   Graduate School of Science and Technology Fundamental Sciences   Associate Professor

    2010.4

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  • Niigata University   Graduate School of Science and Technology Fundamental Sciences   Associate Professor

    2004.4 - 2010.3

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  • Niigata University   Graduate School of Science and Technology   Associate Professor (as old post name)

    2004.2 - 2004.3

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  • Niigata University   Graduate School of Science and Technology   Assistant

    1998.6 - 2004.1

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  • Niigata University Graduate School of Science and Technology Specialized Course Fundamental Sciences   Associate Professor

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Research History

  • Niigata University   Graduate School of Science and Technology Fundamental Sciences   Associate Professor

    2010.4

  • Niigata University   Faculty of Science Department of Physics   Associate Professor

    2010.4 - 2017.3

  • Niigata University   Graduate School of Science and Technology Fundamental Sciences   Associate Professor

    2004.4 - 2010.3

  • Niigata University   Graduate School of Science and Technology   Associate Professor (as old post name)

    2004.2 - 2004.3

  • Niigata University   Graduate School of Science and Technology   Research Assistant

    1998.6 - 2004.1

Qualification acquired

  • Person in Charge of High-pressure Gas Production Security (chemical machinery and frozen machine)

 

Papers

  • Magnetic Bragg peak enhancement under ultrasound injection Reviewed

    Shin-ichi Shamoto, Mitsuhiro Akatsu, Masato Matsuura, Seiko Ohira-Kawamura, Kazuya Harii, Masao Ono, Lieh-Jeng Chang, Takashi U. Ito, Yuichi Nemoto, Jun'ichi Ieda

    Physical Review Research   4 ( 1 )   2022.3

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  • Multiople Fluctuation of Iron Pnictide Superconductor Ba(Fe_1-x_Co_x_)_2_As_2_ Reviewed

    Haruyasu Sato, Mitsuhiro Akatsu, Yuichi Nemoto, Terutaka Goto, Ryosuke Kurihara, Keisuke Mitsumoto, Yoshiaki Kobayashi, Masatoshi Sato

    Proceedings of the International Conference on Strongly Correlated Electron Systems (SCES2019)   ( 30 )   011052-1 - 0-11052-6   2020.3

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    Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:J. Phys. Soc. Jpn.  

    DOI: 10.7566/JPSCP.30.011052

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  • Critical Slowing Down of Quadrupole and Hexadecapole Orderings in Iron Pnictide Superconductor Reviewed

    Ryosuke Kurihara, Keisuke Mitsumoto, Mitsuhiro Akatsu, Yuichi Nemoto, Terutaka Goto, Yoshiaki Kobayashi, Masatoshi Sato

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   86 ( 6 )   2017.6

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.7566/JPSJ.86.064706

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  • Surface acoustic wave diagnosis of vacancy orbital with electric quadrupoles in silicon Reviewed

    T. Goto, K. Mitsumoto, M. Akatsu, S. Baba, K. Okabe, R. Takasu, Y. Nemoto, H. Yamada-Kaneta, Y. Furumura, H. Saito, K. Kashima, Y. Saito

    INTERNATIONAL CONFERENCE ON STRONGLY CORRELATED ELECTRON SYSTEMS 2014 (SCES2014)   592   2015

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    Language:English   Publishing type:Research paper (international conference proceedings)  

    DOI: 10.1088/1742-6596/592/1/012150

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  • Magneto-Elastic Effects in Tb3Ga5O12 Reviewed

    Ute Loew, Sergei Zherlitsyn, Koji Araki, Mitsuhiro Akatsu, Yuichi Nemoto, Terutaka Goto, Uli Zeitler, Bruno Luethi

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   83 ( 4 )   2014.4

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    DOI: 10.7566/JPSJ.83.044603

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  • Elastic Softening of Surface Acoustic Wave Caused by Vacancy Orbital in Silicon Wafer Reviewed

    Keisuke Mitsumoto, Mitsuhiro Akatsu, Shotaro Baba, Rie Takasu, Yuichi Nemoto, Terutaka Goto, Hiroshi Yamada-Kaneta, Yuji Furumura, Hiroyuki Saito, Kazuhiko Kashima, Yoshihiko Saito

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   83 ( 3 )   2014.3

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    DOI: 10.7566/JPSJ.83.034702

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  • Role of Hyperfine Coupling in Magnetic and Quadrupolar Ordering of Pr3Pd20Si6 Reviewed

    L. Steinke, K. Mitsumoto, C. F. Miclea, F. Weickert, A. Doenni, M. Akatsu, Y. Nemoto, T. Goto, H. Kitazawa, P. Thalmeier, M. Brando

    PHYSICAL REVIEW LETTERS   111 ( 7 )   2013.8

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    DOI: 10.1103/PhysRevLett.111.077202

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  • Quadrupole Ordering and Rattling Motion of Clathrate Compound Pr3Pd20Ge6 Reviewed

    Genki Ano, Mitsuhiro Akatsu, Koji Araki, Kazuo Matsuo, Yoshiaki Tachikawa, Keisuke Mitsumoto, Takashi Yamaguchi, Yuichi Nemoto, Terutaka Goto, Naoya Takeda, Andreas Doenni, Hideaki Kitazawa

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   81 ( 3 )   2012.3

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1143/JPSJ.81.034710

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  • Dissipation in Non-Kramers Doublet of PrMg3 Reviewed

    Koji Araki, Terutaka Goto, Keisuke Mitsumoto, Yuichi Nemoto, Mitsuhiro Akatsu, Hiroyuki S. Suzuki, Hiroshi Tanida, Shigeru Takagi, Shadi Yasin, Sergei Zherlitsyn, Joachim Wosnitza

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   81 ( 2 )   2012.2

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1143/JPSJ.81.023710

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  • Quadrupole Effects of Vacancy Orbital in Boron-Doped Silicon Reviewed

    Shotaro Baba, Terutaka Goto, Yuta Nagai, Mitsuhiro Akatsu, Hajime Watanabe, Keisuke Mitsumoto, Takafumi Ogawa, Yuichi Nemoto, Hiroshi Yamada-Kaneta

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   80 ( 9 )   2011.9

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1143/JPSJ.80.094601

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  • Multipole effects of Gamma(3) doublet-Gamma(4) triplet states in PrMg3 Reviewed

    Koji Araki, Yuichi Nemoto, Mitsuhiro Akatsu, Shinya Jumonji, Terutaka Goto, Hiroyuki S. Suzuki, Hiroshi Tanida, Shigeru Takagi

    PHYSICAL REVIEW B   84 ( 4 )   2011.7

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1103/PhysRevB.84.045110

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  • Rattling in Clathrate Compounds of ROs4Sb12 and R3Pd20Ge6 Reviewed

    Yuichi Nemoto, Tatsuya Yanagisawa, Yuri Yasumoto, Haruki Kobayashi, Akio Yamaguchi, Seiji Tsuduku, Terutaka Goto, Naoya Takeda, Akira Ochiai, Hitoshi Sugawara, Hideyuki Sato, Hideaki Kitazawa

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   77   153 - 158   2008.1

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1143/JPSJS.77SA.153

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

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

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

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/j.physb.2006.01.070

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  • Tunneling and rattling in clathrate crystal Reviewed

    T Goto, Y Nemoto, T Yamaguchi, M Akatsu, T Yanagisawa, O Suzuki, H Kitazawa

    PHYSICAL REVIEW B   70 ( 18 )   2004.11

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1103/PhysRevB.70.184126

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  • Quadrupolar effect and rattling motion in the heavy-fermion superconductor PrOs4Sb12 Reviewed

    T Goto, Y Nemoto, K Sakai, T Yamaguchi, M Akatsu, T Yanagisawa, H Hazama, K Onuki, H Sugawara, H Sato

    PHYSICAL REVIEW B   69 ( 18 )   2004.5

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1103/PhysRevB.69.180511

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  • Ferroquadrupole ordering and Gamma(5) rattling motion in the clathrate compound Ce3Pd20Ge6 Reviewed

    Y Nemoto, T Yamaguchi, T Horino, M Akatsu, T Yanagisawa, T Goto, O Suzuki, A Donni, T Komatsubara

    PHYSICAL REVIEW B   68 ( 18 )   2003.11

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1103/PhysRevB.68.184109

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  • Ultrasonic investigations of Ferroquadrupolar Ordering at 8c Site in Ce3Pd20Ge6 Reviewed

    Yuichi Nemoto, Takashi Yamaguchi, Terutaka Goto, Osamu Suzuki, Takenobu Horino, Andreas Donni, Takemi Komatsubara

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   71   121 - 123   2002.1

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    DOI: 10.1143/JPSJS.71S.121

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  • Quadrupolar effect in the perovskite manganite La1-xSrxMnO3 Reviewed

    H Hazama, T Goto, Y Nemoto, Y Tomioka, A Asamitsu, Y Tokura

    PHYSICAL REVIEW B   62 ( 22 )   15012 - 15020   2000.12

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  • Elastic soft mode and charge ordering of Yb4As3 Reviewed

    T Goto, Y Nemoto, A Ochiai, T Suzuki

    PHYSICAL REVIEW B   59 ( 1 )   269 - 276   1999.1

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  • Inelastic neutron scattering study of magnon excitation by ultrasound injection in yttrium iron garnet Reviewed

    Shamoto Shinichi, Akatsu Mitsuhiro*, Chang L.-J.*, Nemoto Yuichi*, Ieda Junichi

    Applied Physics Letters   124 ( 11 )   112402\_1 - 112402\_5   2024.3

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    The magnon excitation by ultrasound injection in Y$_3$Fe$_5$O$_{12}$ is studied by inelastic neutron scattering. Both longitudinal and transverse ultrasound injections enhanced the inelastic neutron scattering intensity.

    DOI: 10.1063/5.0189768

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  • Observation of Ferro-Quadrupole Quantum Criticality in Iron Pnictide Superconductor Ba(Fe1−xCox)2As2

    Haruyasu Sato, Mitsuhiro Akatsu, Ryosuke Kurihara, Yoshiaki Kobayashi, Yuichi Nemoto

    Journal of the Physical Society of Japan   2023.12

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    DOI: 10.7566/JPSJ.92.124710

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  • Ultralow-energy magnon anomaly in yttrium iron garnet

    Shin-ichi Shamoto, Yukio Yasui, Masato Matsuura, Mitsuhiro Akatsu, Yoshiaki Kobayashi, Yuichi Nemoto, Jun'ichi Ieda

    Physical Review Research   2 ( 3 )   2020.8

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  • Thermal expansion and magnetostriction of clathrate compound Pr3Pd20Ge6 Reviewed

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

    Journal of Physics: Conference Series   969 ( 1 )   2018.4

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    Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:Institute of Physics Publishing  

    DOI: 10.1088/1742-6596/969/1/012120

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  • Neutron scattering study of yttrium iron garnet Reviewed

    Shin-Ichi Shamoto, Takashi U. Ito, Hiroaki Onishi, Hiroki Yamauchi, Yasuhiro Inamura, Masato Matsuura, Mitsuhiro Akatsu, Katsuaki Kodama, Akiko Nakao, Taketo Moyoshi, Koji Munakata, Takashi Ohhara, Mitsutaka Nakamura, Seiko Ohira-Kawamura, Yuichi Nemoto, Kaoru Shibata

    Physical Review B   97 ( 5 )   2018.2

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1103/PhysRevB.97.054429

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

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

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

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

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

    PHYSICAL REVIEW B   90 ( 10 )   2014.9

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1103/PhysRevB.90.100402

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  • Absolute value determination of vacancy concentration in silicon crystals using low-temperature ultrasonic measurements

    H. Yamada-Kaneta, K. Okabe, M. Akatsu, S. Baba, K. Mitsumoto, Y. Nemoto, T. Goto, H. Saito, K. Kashima, Y. Saito

    ECS Transactions   64 ( 11 )   13 - 18   2014

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    Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:Electrochemical Society Inc.  

    DOI: 10.1149/06411.0013ecst

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  • Strong Quadrupole-Strain Interaction of Vacancy Orbital in Boron-Doped Czochralski Silicon Reviewed

    Kazuki Okabe, Mitsuhiro Akatsu, Shotaro Baba, Keisuke Mitsumoto, Yuichi Nemoto, Hiroshi Yamada-Kaneta, Terutaka Goto, Hiroyuki Saito, Kazuhiko Kashima, Yoshihiko Saito

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   82 ( 12 )   2013.12

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    DOI: 10.7566/JPSJ.82.124604

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  • Low-temperature softening due to vacancy orbital with Λ8 quartet ground state in boron-doped floating zone silicon Reviewed

    Shotaro Baba, Mitsuhiro Akatsu, Keisuke Mitsumoto, Satoru Komatsu, Kunihiko Horie, Yuichi Nemoto, Hiroshi Yamada-Kaneta, Terutaka Goto

    Journal of the Physical Society of Japan   82 ( 8 )   2013.8

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    DOI: 10.7566/JPSJ.82.084604

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  • Quadrupole effects in tetragonal crystals PrCu2Si2 and DyCu2Si2 Reviewed

    Keisuke Mitsumoto, Saori Goto, Yuichi Nemoto, Mitsuhiro Akatsu, Terutaka Goto, Nguyen D. Dung, Tatsuma D. Matsuda, Yoshinori Haga, Tetsuya Takeuchi, Kiyohiro Sugiyama, Rikio Settai, Yoshichika Onuki

    JOURNAL OF PHYSICS-CONDENSED MATTER   25 ( 29 )   2013.7

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    DOI: 10.1088/0953-8984/25/29/296002

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  • Antiferroquadrupolar ordering and magnetic-field-induced phase transition in the cage compound PrRh2Zn20 Reviewed

    Isao Ishii, Hitoshi Muneshige, Shuhei Kamikawa, Takahiro K. Fujita, Takahiro Onimaru, Naohiro Nagasawa, Toshiro Takabatake, Takashi Suzuki, Genki Ano, Mitsuhiro Akatsu, Yuichi Nemoto, Terutaka Goto

    PHYSICAL REVIEW B   87 ( 20 )   2013.5

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1103/PhysRevB.87.205106

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  • Coexistence of Ising and XY Spin Systems on a Single Tb Atom in TbCoGa5 Reviewed

    Naoyuki Sanada, Yuta Amou, Ryuta Watanuki, Kazuya Suzuki, Isao Yamamoto, Hiroyuki Mitamura, Toshiro Sakakibara, Mitsuhiro Akatsu, Yuichi Nemoto, Terutaka Goto

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   82 ( 4 )   2013.4

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.7566/JPSJ.82.044713

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  • Magnetic phase diagram of clathrate compound Ce3Pd20Si6 with quadrupolar ordering

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

    JOURNAL OF PHYSICS-CONDENSED MATTER   25 ( 12 )   2013.3

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

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  • Effect of Nitrogen Doping on Vacancy State in Silicon Crystals Observed by Low-Temperature Ultrasonic Measurements Reviewed

    Hiroshi Yamada-Kaneta, Satoru Komatsu, Shotaro Baba, Yuta Nagai, Mitsuhiro Akatsu, Yuichi Nemoto, Terutaka Goto

    DEFECTS-RECOGNITION, IMAGING AND PHYSICS IN SEMICONDUCTORS XIV   725   217 - +   2012

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    DOI: 10.4028/www.scientific.net/MSF.725.217

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  • Specific heat of Ce3Pd20Si6 single crystal in magnetic fields

    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

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

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  • Antiferro-Quadrupolar Ordering at the Lowest Temperature and Anisotropic Magnetic Field-Temperature Phase Diagram in the Cage Compound PrIr2Zn20 Reviewed

    Isao Ishii, Hitoshi Muneshige, Yasuhiko Suetomi, Takahiro K. Fujita, Takahiro Onimaru, Keisuke T. Matsumoto, Toshiro Takabatake, Koji Araki, Mitsuhiro Akatsu, Yuichi Nemoto, Terutaka Goto, Takashi Suzuki

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   80 ( 9 )   2011.9

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    DOI: 10.1143/JPSJ.80.093601

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  • Quadrupole Effects of Layered Iron Pnictide Superconductor Ba(Fe0.9Co0.1)(2)As-2 Reviewed

    Terutaka Goto, Ryosuke Kurihara, Koji Araki, Keisuke Mitsumoto, Mitsuhiro Akatsu, Yuichi Nemoto, Shunichi Tatematsu, Masatoshi Sato

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   80 ( 7 )   2011.7

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    DOI: 10.1143/JPSJ.80.073702

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  • Ultrasonic Measurements on the Cage-Structured Clathrate Compound U3Pd20Si6 Reviewed

    Yanagisawa, Tatsuya, Tateiwa, Naoyuki, Mayama, Taichi, Saito, Hitoshi, Hidaka, Hiroyuki, Amitsuka, Hiroshi, Haga, Yoshinori, Nemoto, Yuichi, Goto, Terutaka

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   80   2011.7

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    DOI: 10.1143/JPSJS.80SA.SA105

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  • Elastic properties of TbCoGa5 under magnetic field Reviewed

    Naoyuki Sanada, Ryuta Watanuki, Kazuya Suzuki, Mitsuhiro Akatsu, Yuichi Nemoto, Terutaka Goto

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   80   2011.7

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1143/JPSJS.80SA.SA082

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  • Crystal Field Level Diagrams at the Pr Sites (8c) and (4a) in the Clathrate Compound Pr3Pd20Si6 Reviewed

    Andreas Doenni, Hideaki Kitazawa, Thierry Straessle, Lukas Keller, Masaaki Matsuda, Kazuhisa Kakurai, Genki Ano, Mitsuhiro Akatsu, Yuichi Nemoto, Terutaka Goto

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   80 ( 4 )   2011.4

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    DOI: 10.1143/JPSJ.80.044715

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  • Magnetic-Field-Independent Ultrasonic Dispersions in the Magnetically Robust Heavy Fermion System SmOs4Sb12 Reviewed

    Yanagisawa, Tatsuya, Ikeda, Yoichi, Saito, Hitoshi, Hidaka, Hiroyuki, Amitsuka, Hiroshi, Araki, Koji, Akatsu, Mitsuhiro, Nemoto, Yuichi, Goto, Terutaka, Ho, Pei-Chun, Baumbach, Ryan E., Maple, M. Brian

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   80 ( 4 )   2011.4

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    DOI: 10.1143/JPSJ.80.043601

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  • Low-Temperature Elastic Properties of Non-Kramers Doublet Compound PrMg(3)

    K. Araki, K. Mitsumoto, M. Akatsu, Y. Nemoto, T. Goto, H. S. Suzuki, H. Tanida, S. Takagi, S. Yasin, S. Zherlitsyn, J. Wosnitza

    INTERNATIONAL CONFERENCE ON STRONGLY CORRELATED ELECTRON SYSTEMS (SCES 2010)   273   2011

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    DOI: 10.1088/1742-6596/273/1/012133

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  • Quadrupole Ordering and Rattling in Clathrate Compound Pr3Pd20Ge6

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

    INTERNATIONAL CONFERENCE ON STRONGLY CORRELATED ELECTRON SYSTEMS (SCES 2010)   273   2011

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    DOI: 10.1088/1742-6596/273/1/012002

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  • Magnetic and Thermal Properties of Cubic Single-Crystal PrCu4Ag Reviewed

    Shuai Zhang, Yosikazu Isikawa, Takashi Tayama, Tomohiko Kuwai, Toshio Mizushima, Mitsuhiro Akatsu, Yuichi Nemoto, Terutaka Goto

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   79 ( 11 )   2010.11

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    DOI: 10.1143/JPSJ.79.114707

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  • Low Temperature Magnetic Properties of Ce3Pd20Si6 Reviewed

    Hiroyuki Mitamura, Takashi Tayama, Toshiro Sakakibara, Seiji Tsuduku, Genki Ano, Isao Ishii, Mitsuhiro Akatsu, Yuichi Nemoto, Terutaka Goto, Akiko Kikkawa, Hideaki Kitazawa

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   79 ( 7 )   2010.7

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    DOI: 10.1143/JPSJ.79.074712

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  • Practical method and physics of evaluation for vacancy concentration of silicon crystals by measuring low-temperature elastic softening

    Hiroshi Yamada-Kaneta, Shotaro Baba, Yuta Nagai, Mitsuhiro Akatsu, Keisuke Mitsumoto, Takashi Yanase, Kazuki Okabe, Yasushi Ono, Yuichi Nemoto, Terutaka Goto

    ECS Transactions   33 ( 11 )   63 - 72   2010

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    DOI: 10.1149/1.3485683

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  • Quadrupole Order in Clathrate Compound Pr3Pd20Si6

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

    INTERNATIONAL CONFERENCE ON MAGNETISM (ICM 2009)   200   2010

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    DOI: 10.1088/1742-6596/200/1/012121

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  • Magnetic Properties of Ce3Pd20Si6 at Very Low Temperatures

    H. Mitamura, T. Sakuraba, T. Tayama, T. Sakakibara, S. Tsuduku, G. Ano, I. Ishii, M. Akatsu, Y. Nemoto, T. Goto, A. Kikkawa, H. Kitazawa

    INTERNATIONAL CONFERENCE ON MAGNETISM (ICM 2009)   200   2010

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    DOI: 10.1088/1742-6596/200/1/012118

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  • Multipole effects in non-Kramers doublet system PrMg3

    K. Araki, T. Yoshikawa, M. Akatsu, I. Ishii, Y. Nemoto, T. Goto, H. S. Suzuki, H. Tanida, S. Takagi, B. Luethi

    PHYSICA B-CONDENSED MATTER   404 ( 19 )   3187 - 3190   2009.10

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    DOI: 10.1016/j.physb.2009.07.051

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

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

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

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    DOI: 10.1016/j.physb.2009.07.081

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  • Quadrupole Ordering in Clathrate Compound Ce3Pd20Si6 Reviewed

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

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   78 ( 2 )   2009.2

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    DOI: 10.1143/JPSJ.78.024716

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  • Low temperature x-ray diffraction study on superconductivity

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

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

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

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  • Low-temperature elastic softening due to vacancies in boron-doped FZ silicon crystals

    Hiroshi Yamada-Kaneta, Hajime Watanabe, Yuta Nagai, Shotaro Baba, Mitsuhiro Akatsu, Yuichi Nemoto, Terutaka Goto

    Solid State Phenomena   156-158   135 - 138   2009

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    DOI: 10.4028/www.scientific.net/SSP.156-158.135

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  • Ultrasonic Dispersion in the Filled Skutterudite CeFe4Sb12

    I. Ishii, T. Suzuki, T. Fujita, I. Mori, H. Sugawara, M. Yoshizawa, Y. Nemoto, T. Goto

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

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    DOI: 10.1088/1742-6596/150/4/042071

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  • Ultrasonic Study of Vacancy in Single Crystal Silicon at Low Temperatures

    M. Akatsu, T. Goto, H. Y-Kaneta, H. Watanabe, Y. Nemoto, K. Mitsumoto, S. Baba, Y. Nagai, S. Nakamura

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

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    DOI: 10.1088/1742-6596/150/4/042002

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  • Vacancies in as-grown CZ silicon crystals observed by low-temperature ultrasonic measurements Reviewed

    Hiroshi Yamada-Kaneta, Terutaka Goto, Yuichi Nemoto, Koji Sato, Masatoshi Hikin, Yasuhiro Saito, Shintaro Nakamura

    JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS   19   S19 - S23   2008.12

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    DOI: 10.1007/s10854-008-9715-0

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  • Ultrasonic investigation of off-center rattling in filled skutterudite compound NdOs4Sb12 Reviewed

    Tatsuya Yanagisawa, Pei-Chun Ho, William M. Yuhasz, M. Brian Maple, Yuri Yasumoto, Hiromu Watanabe, Yuichi Nemoto, Terutaka Goto

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   77 ( 7 )   2008.7

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    DOI: 10.1143/JPSJ.77.074607

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  • Thermodynamic and transport studies of the ferromagnetic filled skutterudite compound PrFe4As12 Reviewed

    T. A. Sayles, W. M. Yuhasz, J. Paglione, T. Yanagisawa, J. R. Jeffries, M. B. Maple, Z. Henkie, A. Pietraszko, T. Cichorek, R. Wawryk, Y. Nemoto, T. Goto

    PHYSICAL REVIEW B   77 ( 14 )   2008.4

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    DOI: 10.1103/PhysRevB.77.144432

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

    Masayuki Udagawa, Takumi Hasegawa, Yuichi Takasu, Norio Ogita, Koichiro Suekuni, Marcos A. Avila, Toshiro Takabatake, Yoshikazu Ishikawa, Naoya Takeda, Yuichi Nemoto, Terutaka Goto, Hitoshi Sugawara, Daisuke Kikuchi, Hideyuki Sato, Chihiro Sekine, Ichimin Shirotani, Jun-Ichi Yamaura, Yohei Nagao, Zenji Hiroi

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   77   142 - 147   2008.1

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    DOI: 10.1143/JPSJS.77SA.142

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  • Quadrupole Susceptibility of Gamma(3) Pseudo-Doublet Ground State in Rare-Earth Garnet Tb3Ga5O12 Reviewed

    Kouji Araki, Terutaka Goto, Yuichi Nemoto, Tatsuya Yanagisawa, Bruno Luethi

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   77   269 - 271   2008.1

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    DOI: 10.1143/JPSJS.77SA.269

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  • Electric Quadrupole Effect in Clathrate Compound Pr3Pd20Si6 Reviewed

    Haruki Kobayashi, Seiji Tsuduku, Osamu Suzuki, Tatsuya Yanagisawa, Yuichi Nemoto, Terutaka Goto, Andreas Doenni, Hideaki Kitazawa, Naoya Takeda

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   77   263 - 265   2008.1

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    DOI: 10.1143/JPSJS.77SA.263

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  • Off-center Rattling and Tunneling in Filled Skutterudite LaOs4Sb12 Reviewed

    Yuri Yasumoto, Akio Yamaguchi, Tatsuya Yanagisawa, Yuichi Nemoto, Terutaka Goto, Akira Ochiai

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   77   242 - 244   2008.1

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    DOI: 10.1143/JPSJS.77SA.242

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  • Vacancies in growth-rate-varied CZ silicon crystal observed by low-temperature ultrasonic measurements Reviewed

    Hiroshi Yamada-Kaneta, Terutaka Goto, Yuichi Nemoto, Koji Sato, Masatoshi Hikin, Yasuhiro Saito, Shintaro Nakamura

    GETTERING AND DEFECT ENGINEERING IN SEMICONDUCTOR TECHNOLOGY XII   131-133   455 - +   2008

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    DOI: 10.4028/www.scientific.net/SSP.131-133.455

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  • Observation of vacancy in crystalline silicon using low-temperature ultrasonic measurements Reviewed

    Terutaka Goto, Hiroshi Yamada-Kaneta, Koji Sato, Masatoshi Hikin, Yuichi Nemoto, Shintaro Nakamura

    PHYSICA B-CONDENSED MATTER   401   109 - 114   2007.12

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    DOI: 10.1016/j.physb.2007.08.124

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  • Vacancies in CZ silicon crystals observed by low-temperature ultrasonic measurements Reviewed

    Hiroshi Yamada-Kaneta, Terutaka Goto, Yuichi Nemoto, Koji Sato, Masatoshi Hikin, Yasuhiro Salto, Shintaro Nakamura

    PHYSICA B-CONDENSED MATTER   401   138 - 143   2007.12

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    DOI: 10.1016/j.physb.2007.08.131

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  • Vacancy distribution in growth-rate-varied CZ silicon crystal observed by low-temperature ultrasonic measurements

    H. Yamada-Kaneta, M. Hikin, T. Goto, Y. Nemoto, K. Sato, Y. Saito, S. Nakamura

    Proceeding of the forum on the science and technology of silicon materials 2007   135 - 140   2007.11

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  • Piezoelectric ZnO sputtering on crystalline silicon for low-temperature ultrasonic measurements

    H. Watanabe, T. Goto, H. Yamada-Kaneta, Y. Nemoto, M. Hikin, T. Yanagisawa, S. Nakamura

    Proceeding of the forum on the science and technology of silicon materials 2007   141 - 142   2007.11

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  • Observation of vacancy in silicon using low-temperature ultrasonic measurements

    T. Goto, H. yamada-Kaneta, M. Hikin, H. Watanabe, K. Sato, Y. Nemoto, T. Yanagisawa, S. Nakamura

    Proceeding of the science and technology of silicon materials 2007   69 - 74   2007.11

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  • Ultrasonic investigations of antiferro-quadrupole ordering in Pr1-xLaxPb3 (x=0,0.02) Reviewed

    Motoi Fukuura, Shinya Jumonji, Yuichi Nemoto, Terutaka Goto, Hiroyuki. S. Suzuki, Toshiro Sakakibara

    JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS   310 ( 2 )   801 - 803   2007.3

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    DOI: 10.1016/j.jmmm.2006.10.002

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  • Magnetic phase diagrams of CexLa1-xB6 in high magnetic fields Reviewed

    Mitsuhiro Akatsu, Nanako Kazama, Terutaka Goto, Yuichi Nemoto, Osamu Suzuki, Giyuu Kido, Satoru Kunii

    JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS   310 ( 2 )   E172 - E174   2007.3

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    DOI: 10.1016/j.jmmm.2006.10.126

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  • Quadrupolar susceptibility of NdOs4Sb12 Reviewed

    Tatsuya Yanagisawa, William M. Yuhasz, Pei-Chun Ho, M. Brian Maple, Hiromu Watanabe, Takafumi Ueno, Yuichi Nemoto, Terutaka Goto

    JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS   310 ( 2 )   223 - 225   2007.3

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    DOI: 10.1016/j.jmmm.2006.10.010

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  • Ultrasonic study of rattling and tunneling in clathrate compounds R3Pd20X6 (R = La, Ce; X = Si, Ge) Reviewed

    Tomoyuki Watanabe, Takashi Yamaguchi, Yuichi Nemoto, Terutaka Goto, Naoya Takeda, Osamu Suzuki, Hideaki Kitazawa

    JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS   310 ( 2 )   280 - 282   2007.3

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    DOI: 10.1016/j.jmmm.2006.10.329

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  • Muon spin relaxation and hyperfine-enhanced Pr-141 nuclear spin dynamics in Pr(Os,Ru)(4)Sb-12 and (Pr,La)Os4Sb12 Reviewed

    Shu L, MacLaughlin D. E, Aoki Y, Tunashima Y, Yonezawa Y, Sanada S, Kikuchi D, Sato H, Heffner R. H, Higemoto W, Ohishi K, Ito T. U, Bernal O. O, Hillier A. D, Kadono R, Koda A, Ishida K, Sugawara H, Frederick N. A, Yuhasz W. M, Sayles T. A, Yanagisawa T, Maple M. B

    Physical Review B   76 ( 1 )   2007

  • Direct observation of vacancy in silicon using sub-Kelvin ultrasonic measurements Reviewed

    Terutaka Goto, Hiroshi Yamada-Kaneta, Yasuhiro Saito, Yuichi Nemoto, Koji Sato, Koichi Kakimoto, Shintaro Nakamura

    MATERIALS SCIENCE AND ENGINEERING B-SOLID STATE MATERIALS FOR ADVANCED TECHNOLOGY   134 ( 2-3 )   233 - 239   2006.10

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    DOI: 10.1016/j.mseb.2006.07.038

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  • Vacancies in defect-free zone of point-defect-controlled CZ silicon observed by low-temperature ultrasonic measurements Reviewed

    Hiroshi Yamada-Kaneta, Terutaka Goto, Yasuhiro Saito, Yuichi Nemoto, Koji Sato, Koichi Kakimoto, Shintaro Nakamura

    MATERIALS SCIENCE AND ENGINEERING B-SOLID STATE MATERIALS FOR ADVANCED TECHNOLOGY   134 ( 2-3 )   240 - 243   2006.10

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    DOI: 10.1016/j.mseb.2006.07.032

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

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

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

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    DOI: 10.1016/j.physb.2006.03.071

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  • Multiple ordered phases in the filled skutterudite compound Pr Os4 As12 Reviewed International coauthorship International journal

    Yuhasz, W.M., Butch, N.P., Sayles, T.A., Ho, P.-C., Jeffries, J.R., Yanagisawa, T., Frederick, N.A., Maple, M.B., Henkie, Z., Pietraszko, A., McCall, S.K., McElfresh, M.W., Fluss, M.J.

    Physical Review B - Condensed Matter and Materials Physics   73 ( 14 )   2006.4

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    DOI: 10.1103/PhysRevB.73.144409

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  • Magnetic phase diagram of antiferroquadrupole ordering in HoB2C2 Reviewed

    T Yanagisawa, T Goto, Y Nemoto, R Watanuki, K Suzuki, O Suzuki, G Kido

    PHYSICAL REVIEW B   71 ( 10 )   2005.3

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    DOI: 10.1103/PhysRevB.71.104416

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  • Ultrasonic investigation of quadrupole ordering in HoB2C2 Reviewed

    T Yanagisawa, T Goto, Y Nemoto, S Miyata, R Watanuki, K Suzuki

    PHYSICAL REVIEW B   67 ( 11 )   2003.3

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    DOI: 10.1103/PhysRevB.67.115129

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  • Ultrasonic investigation of antiferroquadrupole orderings in HoB2C2 and DyB2C2 Reviewed

    T Goto, T Yanagisawa, K Hyodo, Y Nemoto, S Miyata, R Watanuki, K Suzuki

    ACTA PHYSICA POLONICA B   34 ( 2 )   1173 - 1176   2003.2

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  • Thermal Expansion Measurements on Ce0.75La0.25B6 Reviewed

    Mitsuhiro Akatsu, Osamu Suzuki, Yuichi Nemoto, Terutaka Goto, Shintaro Nakamura, Satoru Kunii

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   71   115 - 117   2002.1

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    DOI: 10.1143/JPSJS.71S.115

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  • Anisotropy in the Magnetic Phase Diagrams of CexLa1-xB6 Reviewed

    Shintaro Nakamura, Osamu Suzuki, Terutaka Goto, Yuichi Nemoto, Mitsuhiro Akatsu, Satoru Kunii

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   71   112 - 114   2002.1

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    DOI: 10.1143/JPSJS.71S.112

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  • Quadrupole Susceptibility of HoB2C2 Reviewed

    Terutaka Goto, Tatsuya Yanagisawa, Yuichi Nemoto, Shingo Miyata, Ryuta Watanuki, Kazuya Suzuki

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   71   88 - 90   2002.1

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    DOI: 10.1143/JPSJS.71S.88

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  • Ultrasonic Investigation of Metarnagnetic Transition in CeRu2Si2 Reviewed

    Yanagisawa, Tatsuya, Nemoto, Yuichi, Goto, Terutaka, Onuki, Yoshichika

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   71   267 - 269   2002.1

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    DOI: 10.1143/JPSJS.71S.267

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  • Magnetic Field Dependence of Elastic Constants in Pr1-xCaxMnO3 Reviewed

    Hirofumi Hazama, Yuichi Nemoto, Terutaka Goto, Yasuhide Tomioka, Atsushi Asamitsu, Yoshinori Tokura

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   71   139 - 141   2002.1

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    DOI: 10.1143/JPSJS.71S.139

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  • Coulombic Insight into Charge Ordering in Yb4As3 and Sm3Te4 Reviewed

    Hiroshi Iyetomi, Hideto Higashi, Yuichi Nemoto, Terutaka Goto

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   71   306 - 308   2002.1

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    DOI: 10.1143/JPSJS.71S.306

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  • Ultrasonic investigation of perovskite manganese compounds La1-xSrxMnO3 Reviewed

    T Goto, Y Nemoto, H Hazama, Y Tomioka, A Asamitsu, Y Tokura

    PHYSICS IN LOCAL LATTICE DISTORTIONS: FUNDAMENTALS AND NOVEL CONCEPTS LLD2K   554   417 - 421   2001

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Presentations

  • Observation and evaluation of vacancy in silicon wafers using ultrasound method

    Yuichi Nemoto

    2020.2 

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  • Symmetry breaking with multipoles coupled to strain and rotation in iron pnictide superconductors Invited

    NEMOTO Yuichi

    2018.3 

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  • 超音波によるシリコン原子空孔の量子状態解明と産業応用への展望 Invited

    根本 祐一

    日本学術振興会第239回研究会,材料の微細組織と機能性第133委員会  2018.1 

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  • Observation of vacancy orbital in silicon crystals using low-temperature ultrasonic measurements Invited International conference

    NEMOTO Yuichi

    29th International Conference on Defects in Semiconductors  2017.7 

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  • 原子レベルのウェーハ欠陥検出技術徹底解説

    根本 祐一

    電子ジャーナル誌主催セミナー  2014.10 

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  • 超音波で観る量子力学の世界 Invited

    根本 祐一

    日本物理学会北陸支部特別学術講演会  2014.7 

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Industrial property rights

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Research Projects

  • 超音波による準結晶と近似結晶における電子格子物性の解明

    Grant number:22H04586

    2022.4 - 2024.3

    System name:科学研究費助成事業 新学術領域研究(研究領域提案型)

    Research category:新学術領域研究(研究領域提案型)

    Awarding organization:日本学術振興会

    根本 祐一

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    Grant amount:\8450000 ( Direct Cost: \6500000 、 Indirect Cost:\1950000 )

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  • Development of surface acoustic wave devices and its application to strongly correlated electron systems

    Grant number:15K13518

    2015.4 - 2018.3

    System name:KAKENHI

    Research category:Grant-in-Aid for Challenging Exploratory Research

    Awarding organization:Japan Society for The Promotion of Science

    NEMOTO Yuichi

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    Authorship:Principal investigator  Grant type:Competitive

    Observation of vacancy in silicon crystal and elucidation of its electronic state is a challenging issue in both solid-state physics and application technologies. We successfully observe vacancy orbital through elastic softening with decreasing temperature by using ultrasound measurements. Extended vacancy orbital leads to extremely strong quadrupole-strain interaction, which allows us to observe elastic softening at low temperatures even in dilute vacancy below 1 ppb. Especially, evaluation of vacancy concentration in a surface region of highly qualified silicon wafers is desirable for control of micro defects, that originates in vacancy, about nanometer in size. A benchmark of the achievement of surface acoustic wave with high frequency measurements will be a powerful evaluating method in rapidly advancing semiconductor industry.

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  • Surface acoustic wave investigation of vacancy orbital in silicon wafer

    Grant number:26247059

    2014.6 - 2017.3

    System name:Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A)

    Research category:Grant-in-Aid for Scientific Research (A)

    Awarding organization:Japan Society for the Promotion of Science

    GOTO Terutaka, AKATSU Mitsuhiro, MITSUMOTO Keisuke, KURIHARA Ryosuke, KASHIMA Kazuhiko, SAITO Hiroyuki, FURUMURA Yuji, SAITO Yoshihiko

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    Grant amount:\40560000 ( Direct Cost: \31200000 、 Indirect Cost:\9360000 )

    Ultrasonic investigation on the vacancy in silicon wafers currently used in semiconductor device fabrications is an important issue for both solid-state physics and technological applications. The electron orbital bounded around the vacancy exhibiting largely extended radius possesses the strong quadrupole-strain interaction. This provides us the sizable softening in the elastic constants caused by the vacancies existing in extremely small concentration of a vacancy per 10E10 Si atoms. In the present research, we have employed the surface acoustic wave (SAW) device to generate the Rayleigh wave propagating on the surface of the silicon wafer. We have observed the softening of the Rayleigh wave and its magnetic field dependence. We have found the interaction Hamiltonian for the vacancy orbital and the Rayleigh wave and analyzed the softening by the quadrupole susceptibility. We will develop the vacancy evaluation as a new semiconductor technology in near future.

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  • Study of dissipative quantum state by means of high-frequency ultrasonic devices processed by micromachining

    Grant number:23654116

    2011.4 - 2013.3

    System name:KAKENHI

    Research category:Grant-in-Aid for Challenging Exploratory Research

    Awarding organization:Japan Society for The Promotion of Science

    NEMOTO Yuichi

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    Authorship:Principal investigator  Grant type:Competitive

    We usually use a variety of piezoelectric transducers for generation and detecting of ultrasound signals in low-temperature measurements of elastic constants and ultrasonic attenuation coefficients. In this work, we tried to make high-frequency transducers developed by using processing technology. At first, basic process is involved in manufacturing inverted mesa-type crystals. The thickness of limited central area of conventional AT-cut quarts crystal is etched down to 5 μm for desired frequency over 150 MHz with fundamental mode. We successfully made devices with fundamental frequency of 260 MHz with blanks and applied to measure the elasticconstant C44 in Ce_3Pd_20Ge_6 with inverted mesa-type AT-cut quarts transducer. On the other hand, we found it is difficult to etch practically the LiNbO_3 and LiTaO_3 in thesame process with quarts crystal. The advanced technique using nano-particle fluid is nowdeveloped utilizing for inverted mesa-type tips made of LiNbO_3.

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  • 超音波計測による強相関量子系物理の国際共同研究

    2010.4 - 2013.3

    System name:頭脳循環を加速する若手研究者海外派遣プログラム

    Awarding organization:日本学術振興会

    後藤 輝孝, 実施担当者, 根本 祐一

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  • Study of rattling and electron-phonon interaction in cage-structured compounds

    Grant number:21340097

    2009.4 - 2013.3

    System name:KAKENHI

    Research category:Grant-in-Aid for Scientific Research (B)

    Awarding organization:Japan Society for The Promotion of Science

    NEMOTO Yuichi

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    Authorship:Principal investigator  Grant type:Competitive

    We have performed systematic ultrasonic measurement on 3-20-6 type clathrate compounds and filled-skutterudite compounds to elucidate rattling and tunneling with cage-like nano-space. In the R_3Pd_20Ge_6 multi-structured ultrasonic dispersions in the elastic constant C_44 were observed. On the other hand, we revealed rattling does not emerge in the R_3Pd_20Si_6. These results evidences that conduction bands participate in the formation of anharmonic vibration with Γ_5-type charge fluctuation using the path of electron-phonon interaction. In addition, we found antiferro-type qoadrupole ordering of 8c site at 250 mK and successively of 4a site at 60 mK in Pr_3Pd_20Ge_6.

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  • Strongly correlated quantum phase associated with charge fluctuation

    Grant number:18002008

    2006 - 2010

    System name:Grants-in-Aid for Scientific Research Grant-in-Aid for Specially Promoted Research

    Research category:Grant-in-Aid for Specially Promoted Research

    Awarding organization:Japan Society for the Promotion of Science

    GOTO Terutaka, NEMOTO Yuichi, KITAZAWA Hideaki, SUZUKI Hiroyuki, KANETA Hiroshi, YANAGISAWA Tatsuya, IYETOMI Hiroshi, ONO Yoshiaki, TAKEDA Naoya, TSURUTA Kenji, SAKAI Osamu, AKATSU Mitsuhiro, ISHII Isamu, MITSUMOTO Keisuke

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    Grant amount:\284440000 ( Direct Cost: \218800000 、 Indirect Cost:\65640000 )

    The ultrasonic strains have specified symmetries and couple to the electric quadrupoles of the electronic and ionic quantum states. The ultrasonic measurements of the elastic constants and attenuation coefficients, therefore, may determine the quadrupole susceptibility. In the present projects, using low-temperature ultrasonic phase difference measurement apparatus with a highly velocity resolution, we have carried out a study of non-Kramers doublet of localized 4f-electron in rare-earth compounds, rattling of local oscillator in clathrate compounds, vacancy orbital in boron-doped silicon crystal in pursuing strongly correlated quantum phases associated with charge fluctuation.

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  • Ultrasonic Study of rattling in clathrate compounds

    Grant number:17540318

    2005.4 - 2007.3

    System name:KAKENHI

    Research category:Grant-in-Aid for Scientific Research (C)

    Awarding organization:Japan Society for The Promotion of Science

    NEMOTO Yuichi

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    Authorship:Principal investigator  Grant type:Competitive

    1)We previously observed ultrasonic disperSi_6n due to rattling in heavy-fermion superconductor PrOs_4Sb_<12>. Furthermore, elastic softening proportional to the 1/T was found below 4 K down to T_c=1.85 K, which is attributed to off-center tunneling of Pr ion in a cage. These results support that the strong correlation between rattling/tunneling and heavy-fermion and it's superconductivity in PrOs_4Sb_<12>.
    2)We have made ultrasonic experiments of the Ru substitutional Pr(Os_<1-x>RuX)_4Sb_<12>. As a result, ultrasonic disperSi_6n becomes weak with more substitution of Ru concentration and completely disappears in BCS superconductor PrRu_4Sb_<12>. We proposed that the coupling between the off-center tunneling and conduction electrons will cause the heavy-fermion state and superconductivity in PrOs_4Sb_<12>.
    3)We have examined LaOs_4Sb_<12> without 4f-electron in order to investigate the correlation between rattling and 4f electrons. Ultrasonic disperSi_6n in C_<11> was clearly observed, that means rattling appears without 4f-electron. We conclude that the coupling between off-center mode and surrounding conduction electrons is crucial for the rattling and tunneling.
    4)We have measured elastic constants of NdOs_4Sb_<12> with three 4f electrons. Two distinct ultrasonic disperSi_6ns around 40 K and 15 K were observed in C_<11>. This result indicates that multiple structure of anharmonic potential is formed in a cage as it were, illustrated by two deferent activation energy E and characteristic time τ_0 of the rattling in NdOs_4Sb_<12>.
    5)We have observed elastic softening of C_<11> and C_<44> proportional to the 1/T at low temperatures in NdOs_4Sb_<12>. According to the analysis using quadrupolar susceptibility, we confirmed that the ground state of the crystal field levels of 4f^3 electronic state is Γ_<67> quartet in NdOs_4Sb_<12>.
    6)We have performed ultrasonic measurements of isomorphic compound La_3Pd_<20>Si_6 and Ce_3Pd_<20>Si_6 to study rattling and tunneling. As a result, no ultrasonic dispersions were found in La_3Pd_<20>Si_6 and Ce_3Pd_<20>Si_6 contrary to our previous results of R_3Pd_<20>_Ge6. Here we report that the importance of the conduction bands as well as clathrate structure for the occurrence of rattling and tunneling.
    7)We have observed elastic softening of (C_<11>-C_<12>)/2 and C_<44> proportional to the 1/T at low temperatures in Ce_3Pd_<20>Si_6. We obtained crystal field levels by use of quadrupolar susceptibility to be a Γ_8 quarter ground at 8c site and a Γ_7 doublet ground at 4a site, respectively. Furthermore, we revealed that the presence of antiferro-quadrupolar ordering phase in magnetic fields.

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  • 充填スクッテルダイト化合物の超音波物性と電子格子相互作用の研究

    Grant number:15072202

    2003 - 2007

    System name:科学研究費助成事業 特定領域研究

    Research category:特定領域研究

    Awarding organization:日本学術振興会

    吉澤 正人, 大野 義章, 鈴木 孝至, 根本 祐一, 松川 倫明, 中西 良樹, 後藤 輝孝

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    Grant amount:\118900000 ( Direct Cost: \118900000 )

    1)SmRu_4P_<12>について、特徴的な弾性定数の磁場角度依存性を観測し、この系で実現していると考えられている八極子秩序との関係を論じた。また、軌道角運動を有しないEuRu_4Sb_<12>の弾性定数の磁場中での弾性定数の温度依存性を測定し、充填スクッテルダイト化合物のLS結合描像とjj結合描像の妥当性に関する検討を行った。
    2)複雑な磁気相図から多極子秩序の可能性が指摘されているTbRu_4P_<12>について、圧力下・磁場中の弾性定数の温度依存性を測定し、顕著な弾性軟化現象とその磁場・圧力依存性を観測した。
    3)新しい重い電子系カゴ状化合物TbT_2Zn_<20>(T:Co,Ir,Rh)の弾性定数の温度依存性を測定し、この系の結晶場基底状態に関する知見を得た。
    4)4f電子の存在しないBCS型超伝導体LaOs_4Sb_<12>の超音波実験を行い、ラットリングにともなう超音波分散現象とトンネリングにともなう低温ソフト化を観測した。PrOs_4Sb_<12>とは異なり20mKの極低温でも弾性定数の軟化は続き、この結果から、PrOs_4Sb_<12>ではラットリングやトンネリングの電荷揺らぎが重い電子状態や超伝導に深く関係していることを示した。
    5)NdOs_4Sb_<12>では2つの異なる温度領域に超音波分散現象を観測し、ラットリングの起源となる非調和性に構造があることを示した。また、ROs_4Sb_<12>のラットリングパラメータτ_0とEの系統的な整理を行い、4f電子の違いによる効果を見いだし、局所振動と伝導電子との結合に加え、4f電子と伝導電子との結合がラットリングに重要な相互作用であることを示した。
    6)LaFe_4Sb_<12>に対して、剪断モード弾性率C_<44>において、30Kから80Kまでの温度範囲に弾性率の周波数分散が明確に存在することを発見し、ラットリング運動の存在を証明した。
    7)Type-I立方晶構造を有するクラスレートEu_8Ga_<16>Ge_<30>について、剪断モード弾性率(C_<11>-C_<l2>)/2において、温度50Kから100Kの領域で弾性率の超音波分散を見出した。超音波吸収係数の温度依存性に明確な分散を観測し、本物質におけるラットリング運動の存在を強く示唆する結果を得た。

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  • Lattice and ultrasonic effects of orbital ordering and fluctuation

    Grant number:11220205

    1999 - 2001

    System name:Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research on Priority Areas (B)

    Research category:Grant-in-Aid for Scientific Research on Priority Areas (B)

    Awarding organization:Japan Society for the Promotion of Science

    GOTO Terutaka, KUSAKABE Koichi, HASEGAWA Akira, NEMOTO Yuichi, IYETOMI Hiroshi

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    Grant amount:\42700000 ( Direct Cost: \42700000 )

    In the present project we have investigated on orbital orderings and fluctuations by use of the coupling of the elastic strain of sound waves to the quadrupole of the orbital degrees of freedom. By the ultrasonic measurements, we have investigated the magnetic phase diagram of Ce_xLa_<1-x>B_6 with ヲ」_8 ground state. In the compound x=0.75 the ordered phase IV changes into the antiferro-magnetic phase III. In more diluted compounds x=0.70 and 0.65, however, the phase IV is stable down to absolute zero. The ultrasonic measurements show significant difference in low-temperature limit of C_<44>ofx=0.70, 0.65 and that of x=0.60, 0.50. We have deduced, therefore, that the compounds x=0.60 and 0.50 falls into a non-magnetic ground state showing no distinct phase transition. This is consistent with the previous specific heat measurements by Nakamura et al. In order to examine the order parameter of the phase IV, we have made thermal expansion measurements showing an expansion along the (001) direction and a shrink along the(111) direction in phase IV. This result is a proof for a trigonal distortion in phase IV indicating a quadrupole ordering O_<yz>=O_<zx>=O_<xy>。・.
    We。。have。。found that tetragonal ternary compounds HoB_2C_2 and DyB_2C_2 exhibit softenings in (C_<11>-C_<12>)/2, C_<44>, C_<66>. These results indicate a pseudo-triplet model consisting of E-doublet and B or A singlet is responsible for HoB_2C_2 and a pseudo-quartet model with E_<1/2> doublet and E_<3/2> doublet is for DyB_2C_2. We have also performed ultrasonic investigation on La_<1-x>Sr_xMnO_3 and Pr_xCa_<1-x>MnO_3 to investigate their orbital orderings. We have commonly observed the softening in (C_<11>-C_<12>)/2, in para-phase, where the Jahn-Teller coupling of quadrupoles O^0_2 and O^2_2 of E_g doublet is responsible. We obtained the energy gain 10。チ100K, which is considerable smaller than that in Mills' theory. The elastic softening in C_<44> due to charge ordering in Pr_xCa_<1-x>MnO_3 with x=0.50 has been found. We have successfully applied the Landau theory to explain the charge ordering of the system associated with the softening of C_<44>.

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  • 縮退バンド超伝導体における四極子と16極子の量子揺らぎによる臨界現象

    Grant number:23K03319

    2023.4 - 2026.3

    System name:科学研究費助成事業

    Research category:基盤研究(C)

    Awarding organization:日本学術振興会

    根本 祐一

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    Grant amount:\4550000 ( Direct Cost: \3500000 、 Indirect Cost:\1050000 )

    鉄系超伝導はその発見以降,超伝導発現機構をめぐり世界的に活発な研究が展開されている。鉄系超伝導体では3d電子軌道による縮退バンドの特徴があり,構造相転移と超伝導が量子臨界点を中心に競合する相図を示す。電子スピンのみならず軌道の揺らぎをともなう新しい超伝導の開拓を目指し,鉄ヒ素超伝導体Ba(Fe1-xCox)2As2の縮退バンドに着目し超音波実験を行った。この縮退バンドは電気四極子をもつので,母物質では電子間の四極子相互作用により140Kで構造相転移する際,弾性定数C66が転移点に向かって巨大なソフト化を示す。これは電子系の強四極子秩序と理解できる。オーバードープ領域x=0.071ではC66のソフト化は減少するが,超音波吸収係数a66が超伝導転移に向かって発散的に増大することを発見した。縮退バンドがもつもう1つの自由度は軌道角運動量であり,結晶場の中心力場ではエネルギー利得を生まない。そのため自由度として存在はしているが通常は物性に影響を与えない。ところが,2電子間にわずかでも異方的な四極子相互作用が存在すると,軌道角運動量の時間微分であるトルクが発生し,2電子状態がもつ電気16極子が活性となる。これがA2表現に属する横波超音波による回転と直接結合し,a66の発散的な臨界挙動を引き起こすことを検証した。新たにx=0.057ではC66のソフト化の解析から,構造相転移0Kの量子臨界近傍にあることが分かった。また,これまで測定できていなかった母物質での超音波吸収a66の測定に初めて成功し,C66とa66が互いにクラマースクローニッヒの関係を満たすことを実証した。母物質x=0と量子臨界x=0.057との比較により,量子臨界での超音波吸収から明らかになった異常に大きな臨界指数と量子揺らぎの効果について,フォノン弾性論と群論にもとづいて考察した結果を論文報告した。

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  • Ultrasonic study of quadrupole-strain coupling of silicon vacancy

    Grant number:15K17704

    2015.4 - 2019.3

    System name:Grants-in-Aid for Scientific Research Grant-in-Aid for Young Scientists (B)

    Research category:Grant-in-Aid for Young Scientists (B)

    Awarding organization:Japan Society for the Promotion of Science

    MITSUMOTO Keisuke, NEMOTO Yuichi, AKATSU Mitsuhiro, GOTO Terutaka

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    Grant amount:\4160000 ( Direct Cost: \3200000 、 Indirect Cost:\960000 )

    Observation of vacancies in crystalline silicon and elucidation of its electronic state are important issues in terms of basic and applied researches. There are rare vacancies in the crystalline silicon currently used in semiconductor industry, and the electronic state of the vacancy has cubic symmetry. We elucidated a mechanism for coupling electric quadrupoles of the vacancy and ultrasonic strains by measuring of pressure dependence of the softening of elastic constant and analyzing them with electric quadrupole susceptibilities. When concentration of the vacancy is above a critical concentration, the vacancy deforms from cubic to lower symmetry due to development of the quadrupole-strain coupling. This is consistent with previous and famous studies of the electron spin resonance.

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  • Determination of formation energy of single vacancy in silicon by means of rapir queching of high-temperature thermal euilibrium

    Grant number:26390055

    2014.4 - 2018.3

    System name:Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)

    Research category:Grant-in-Aid for Scientific Research (C)

    Awarding organization:Japan Society for the Promotion of Science

    Kaneta Hiroshi, NEMOTO Yuichi, GOTO Terutaka

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    Grant amount:\4940000 ( Direct Cost: \3800000 、 Indirect Cost:\1140000 )

    The silicon wafers were annealed at high-temperatures, to successfully realize the thermal equilibrium of defects in the silicon wafers. The wafers were then quenched. The concentrations of the quenched-in vacancies were determined by means of the low-temperature ultrasonic measurement for the softening of the elastic constant C44. By applying our theory of low-temperature elastic softening to the measured softening, we determined the concentration of quenched-in vacancies. Using these values, we evaluated the formation energy of the vacancy. The obtained value for the formation energy was smaller than expected from the conventional knowledge. We however clarified the reason for the disagreement: imperfect quenching with insufficient cooling rate and neglect of the out-diffusion of the vacancies. We conclude that our experimental approach will allow us to derive the accurate value of the vacancy’s formation energy, if these inappropriate procedures in the experiment will be corrected.

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  • Determination of absolute value of vacancy concentration for silicon crystal using low-temperature ultrasonic measurement

    Grant number:21560012

    2009 - 2011

    System name:Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)

    Research category:Grant-in-Aid for Scientific Research (C)

    Awarding organization:Japan Society for the Promotion of Science

    KANETA Hiroshi, GOTO Terutaka, NEMOTO Yuichi

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    Grant amount:\4550000 ( Direct Cost: \3500000 、 Indirect Cost:\1050000 )

    Regarding the sample preparation in this study performed by the annealing furnace in the laboratory of university-level cleanness, we have found the following two problems :(1) The cleanness of the laboratory is totally inadequate in order to anneal well-cleaned samples in the contamination-free ambient.(2) The cooling(quenching) speed is insufficient to freeze the vacancies which are in thermal equilibrium in the annealing. We have found that the best way to resolve these problems is to prepare the samples by using the apparatuses and facilities in silicon wafer manufacturing company. The level of the cleanness of the apparatus and the clean room is far higher than that of those in the university. The quenching with sufficiently high speed can also be realized by the rapid thermal annealer(RAT) adopted in silicon wafer manufacturing. In this case however, we have to deal with the silicon wafers of surface orientation<001> and the thickness thinner than 0. 8 mm, instead of the block-shaped samples we first considered for the experiment. In this case, we also have to totally change the regular condition of the ultrasonic measurement into a special one, where we measure the elastic constantC11 by using the longitudinal sound wave propagating along<001> direction through the very thin sample(wafer). We have shown that this method of measurement for the elastic softening is possible. Sample preparation using the RTA in silicon wafer manufacturer is now in progress.

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  • Single crystal growth of cubic rare earth compounds with integer quantum number of rare earths and studies of anomalous properties reflecting the quadrupole interactions

    Grant number:21540356

    2009 - 2011

    System name:Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)

    Research category:Grant-in-Aid for Scientific Research (C)

    Awarding organization:Japan Society for the Promotion of Science

    ISIKAWA Yosikazu, KUWAI Tomohiko, MIZUSHIMA Toshio, PASCAL LEJAY Neel institut

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    Grant amount:\4420000 ( Direct Cost: \3400000 、 Indirect Cost:\1020000 )

    Interested in the praseodymium compounds showing the heavy-fermion-like behavior, we considered the origin of this property reflects the quadrupole moments. In this study we carried out the experiments of specific heat, thermo electric power, and magnetization of cubic rare-earth compounds with integer quantum number of rare earths. Anomalous properties of these compounds are analyzed taking into account of the coexistence of magnetic and quadrupole moments.

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  • Spectroscopic studies on novel electronic phase due to large amplitude atomic oscillations

    Grant number:20102005

    2008 - 2012

    System name:Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)

    Research category:Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)

    Awarding organization:Japan Society for the Promotion of Science

    TOU Hideki, SUZUKI Takashi, UDAGAWA Masayuki, IWASA Kazuaki, LEE Chul-ho, TSUTSUI Satoshi, NEMOTO Yuichi, ALFRED Baron, URUGA Tomoya

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    Grant amount:\167440000 ( Direct Cost: \128800000 、 Indirect Cost:\38640000 )

    NMR, ultrasonic, Raman scattering, X-ray scattering, and inelastic neutron scattering experiments were carried out to clarify the properties of the ground state in caged compounds. (1) The rattling motions of guest atoms in type -I clathrates correspond to the characteristic temperature scale of 20-30 K, and strongly interact with conduction electron states. Significant electron-local phonon coupling leads to enhancement of various physical quantities. (2) The heavy fermion behavior in ROs4Sb12 is attributed to the correlation between the conduction electrons and the lowest energy excitation, either rattling state or crystal electric field (CEF) state. (3) The primary order parameter of SmRu_4P_<12> is found to be an octupole T^α, or T^β. (4) Phonon anomalies in GdB_6 and DyB_6 are expected to be caused by strong electron-phonon interaction. (5) The structural phase transition observed in RT_2Xn_<20> is attributed to rattling transition due to the strong electro-phonon coupling. In PrIr_2Zn_<20>, the rattling transition is suppressed and the antiferroquadrupolar ordering occurs at T_Q.

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  • Novel Magnetism and Superconductivity on Filled Skutterudite Compounds which Possess Rattling

    Grant number:20740192

    2008 - 2009

    System name:Grants-in-Aid for Scientific Research Grant-in-Aid for Young Scientists (B)

    Research category:Grant-in-Aid for Young Scientists (B)

    Awarding organization:Japan Society for the Promotion of Science

    YANAGISAWA Tatsuya, GOTO Terutaka, TAKEDA Naoya, NEMOTO Yuichi, MAPLE M. Brian, E. BAUMBACH Ryan, HO Pei-Chun

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    Grant amount:\4030000 ( Direct Cost: \3100000 、 Indirect Cost:\930000 )

    Ultrasonic measurements on the Filled-Skutterudite compounds Pr_<1-x>NdxOs_4Sb_<12>(x=0.45, 0.25, 1.0)have been performed. Frequency dependences of elastic constant C11 were investigated with longitudinal ultrasonic frequencies varying between 34 to 245 MHz on these samples. A characteristic ultrasonic dispersion, which had also been observed in PrOs_4Sb_<12> (x=0) at around 30K, is also observed in the dilute systems and shifts gradually to higher temperature with increasing the Nd concentration x. On the other hand, the C11 of x=0.45 sample shows softening and levels off feature at T=0.25K. This result implies that the Nd3+ ion's degenerate CEF ground state is split due to some order even in the Pr^<3+> ion's contribution to SC. In addition, a magnetically robust elastic softening of C11 was found in the end material NdOs_4Sb_<12> (x=1.0) under magnetic field 2 T<H<10T at low temperature T<1K, which suggest a presence of the off-center tunneling as same as LaOs_4Sb_<12> and PrOs_4Sb_<12>. Above results imply that an origin of the heavy-fermion state of NdOs_4Sb_<12> could possibly be related to a degenerate quantum ground state due to the off-center degrees of freedom.

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  • The study on enhancement effect of photocatalytsis under visible light irradiation with the oxide photocatalysts

    Grant number:14350341

    2002 - 2004

    System name:Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)

    Research category:Grant-in-Aid for Scientific Research (B)

    Awarding organization:Japan Society for the Promotion of Science

    YAMADA Yuh, KUBO Syugo, MATSUSHITA Akiyuki, YE Jinhua, GOTO Terutaka, NEMOTO Yuichi

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    Grant amount:\13500000 ( Direct Cost: \13500000 )

    Since photo-induced decomposition of water on TiO_2 electrodes was discovered, semiconductor-based photocatalysis has attracted extensive interest. Most of the investigations have focused on TiO_2, which shows relatively high activity and chemical stability under UV light irradiation. Therefore, there is an urgent need to develop new types of photocatalysts that can yield high activity under visible light irradiation, because the attempt is aimed at producing hydrogen of clean-energy from water utilizing solar energy. We have investigated the electric and crystal structural changes on the oxide photocatalysts, resulting in a change in photocatalytLc property. The results are explained in the following.
    1.In addition to the reported InTaO_4 and InNbO_4 photocatalysts, 3d transition metal V compound InVO_4 was found to be a visible light driven photocatalyst for H_2 evolution from pure water. Then, we have also investigated the substitute system MVO_4 under high pressure. We found the phase transition in CeVO_4 up to 6 GPa.
    2.We have demonstrated efficiently photocatalytic degradation of methylene blue dye over the oxide photocatalyst R_2BaCuO_5(R=lanthanoid) under visible light irradiation. Nd_2BaCuO_5 oxide was found the high activity under visible light irradiation.
    3.We have found superconductivity in the Pr_2Ba_4Cu_7O_<15-δ> possessing metallic double chains when the oxide photocatalysts were searched.

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  • Study of the acoustic de Haas effect by the ultrasonic measurements

    Grant number:09304039

    1997 - 1999

    System name:Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A)

    Research category:Grant-in-Aid for Scientific Research (A)

    Awarding organization:Japan Society for the Promotion of Science

    GOTO Terutaka, DONNI Andreas, OCHIAI Akira, HASEGAWA Akira, KATAOKA Mitsuo, NEMOTO Yuichi

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    Grant amount:\41200000 ( Direct Cost: \41200000 )

    The de Haas effect of the oscillatory magnetization is a method to observe the Fermi surface of metallic compounds. The acoustic de Haas effect by the measurement of the sound velocity and attenuation coefficient is a unique method to determine the electron-lattice interaction in the itinerant electron system. In the present project, we focus on the precise measurement of the sound velocity as a function of the magnetic field at low temperatures. In the case of the heavy Fermion system, the measurements in the extreme condition with low temperature and high magnetic field is required to detect the quantum oscillation due to the Landau state in field. In the last three years, we have developed an low-temperature ultrasonic system with a superconducting magnet up to 180kOe and a dilution refrigerator down to 10mK. The top-loading probe of the dilution refrigerator is equipped by a gonio meter for sample rotation and coaxial lines for high frequency measurement. For the first cooling, we measured a typical example of the heavy Fermion systems CeRuィイD22ィエD2SiィイD22ィエD2, which has been grown by Prof. Onuki. Above the metamagetic transition of 80kOe, the quantum oscillation of the longitudinal CィイD211ィエD2 mode has been clearly detected below 600mK down to 20mK. The effective mass of the branch is 3.5m0. The ultrasonic measurement system in low temperature and high magnetic field in Niigata University is the most excellent apparatus for the investigation of the Fermi surface of the heavy Fermion system, the quadrupolar effect of 4f- and 3d-elecron compounds and the charge fluctuation effect in the mixed valence compounds. Our ultrasonic system is opened for cooperative works with many scientist in the world.

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Teaching Experience

  • 量子研究の最前線

    2023
    Institution name:新潟大学

  • 先端科学技術総論

    2023
    Institution name:新潟大学

  • 日本事情自然系A

    2023
    Institution name:新潟大学

  • 理学基礎演習

    2022
    Institution name:新潟大学

  • 固体物性物理学III

    2022
    Institution name:新潟大学

  • 物理学特論IV

    2022
    Institution name:新潟大学

  • 物理学演習C

    2021
    Institution name:新潟大学

  • 物理学演習D

    2021
    Institution name:新潟大学

  • 強相関物理学II

    2021
    Institution name:新潟大学

  • 現代物理学セミナーA

    2020
    Institution name:新潟大学

  • 現代物理学セミナーB

    2020
    Institution name:新潟大学

  • 専門力アクティブ・ラーニング

    2020
    Institution name:新潟大学

  • Physics TodayⅡ

    2020
    Institution name:新潟大学

  • 物性物理学

    2019
    Institution name:新潟大学

  • 理学スタディ・スキルズ

    2019
    -
    2021
    Institution name:新潟大学

  • 物理学演習A

    2018
    Institution name:新潟大学

  • 課題研究D

    2018
    Institution name:新潟大学

  • 課題研究C

    2018
    Institution name:新潟大学

  • 課題研究B

    2018
    Institution name:新潟大学

  • 課題研究A

    2018
    Institution name:新潟大学

  • 物理学実験A

    2017
    Institution name:新潟大学

  • 物理学演習B

    2017
    Institution name:新潟大学

  • 物理学実験B

    2017
    Institution name:新潟大学

  • 物理学実験C

    2017
    Institution name:新潟大学

  • 物理学実験D

    2017
    -
    2022
    Institution name:新潟大学

  • 基礎ベクトル解析

    2017
    -
    2020
    Institution name:新潟大学

  • 総合力アクティブ・ラーニング

    2017
    -
    2019
    Institution name:新潟大学

  • 安全教育

    2016
    Institution name:新潟大学

  • プロジェクト研究特別概説

    2014
    Institution name:新潟大学

  • 課題探索特講

    2014
    Institution name:新潟大学

  • 物理学基礎CⅡ

    2013
    -
    2016
    Institution name:新潟大学

  • 数理物質科学特定研究Ⅰ(物理学)

    2013
    -
    2015
    Institution name:新潟大学

  • 数理物質科学演習Ⅰ(物理学)

    2013
    -
    2015
    Institution name:新潟大学

  • 数理物質科学演習Ⅱ(物理学)

    2013
    -
    2015
    Institution name:新潟大学

  • コラボレーション演習

    2013
    -
    2015
    Institution name:新潟大学

  • 数理物質科学特定研究ⅡB(物理学)

    2013
    -
    2015
    Institution name:新潟大学

  • 数理物質科学特定研究ⅡA(物理学)

    2013
    -
    2015
    Institution name:新潟大学

  • 現代物理学への招待(物理学学習法)

    2013
    -
    2014
    Institution name:新潟大学

  • 化学実験

    2009
    -
    2017
    Institution name:新潟大学

  • 物理学実験b

    2009
    Institution name:新潟大学

  • 物理学実験a

    2009
    Institution name:新潟大学

  • 物理学実験

    2009
    Institution name:新潟大学

  • 固体物性物理学Ⅲ

    2008
    -
    2020
    Institution name:新潟大学

  • 物性物理学I

    2008
    -
    2017
    Institution name:新潟大学

  • 強相関物理学Ⅱ

    2008
    -
    2017
    Institution name:新潟大学

  • 固体物性物理学III

    2007
    -
    2022
    Institution name:新潟大学

  • 強相関物理学II

    2007
    -
    2021
    Institution name:新潟大学

  • 物理学基礎ゼミ

    2007
    -
    2018
    Institution name:新潟大学

  • 現代物理学

    2007
    -
    2018
    Institution name:新潟大学

  • 電磁気学演習

    2007
    -
    2016
    Institution name:新潟大学

  • 計測学

    2007
    -
    2011
    Institution name:新潟大学

  • 課題研究b

    2007
    Institution name:新潟大学

  • 課題研究a

    2007
    Institution name:新潟大学

▶ display all