Verification of gradon as a localized atomic vibrations in inhomogeneous matereials with mass gradient
Project/Area Number |
24654080
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Research Category |
Grant-in-Aid for Challenging Exploratory Research
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Allocation Type | Multi-year Fund |
Research Field |
Condensed matter physics I
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Research Institution | Tohoku University |
Principal Investigator |
IWASA Kazuaki 東北大学, 理学(系)研究科(研究院), 准教授 (00275009)
|
Project Period (FY) |
2012-04-01 – 2015-03-31
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Project Status |
Completed (Fiscal Year 2014)
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Budget Amount *help |
¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2014: ¥260,000 (Direct Cost: ¥200,000、Indirect Cost: ¥60,000)
Fiscal Year 2013: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2012: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
|
Keywords | フォノン / 質量勾配物質 / 中性子散乱 / X線回折 |
Outline of Final Research Achievements |
Materials are characterized by crystal structures represented in terms of atomic spatial arrangement and vibrations. Cooperative vibration of atomic groups is called phonon (lattice vibration), and it has been investigated for homogeneous systems in detail. In the present research, phonon modes in materials with mass gradient and in materials exhibiting structural transformations are investigated. As one topic of the latter issue, anomalously low-frequency phonon modes are discovered in the rare-earth hexaboride GdB6, TbB6, and DyB6. In particular, these exhibit inhomogeneous state in which micro domains of the low-temperature structure survive at much higher temperature than reported previously. This inhomogeneous structural fluctuation is expected to influence on electrical and thermal conductivity.
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Report
(4 results)
Research Products
(71 results)
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[Journal Article] Polarized neutron spectrometer for inelastic experiments at J-PARC - Status of POLANO Project2015
Author(s)
Tetsuya Yokoo, Kenji Ohoyama, Shinichi Itoh, Kazuaki Iwasa, Naokatsu Kaneko, Junichi Suzuki, Manabu Ohkawara, Kazuya Aizawa, Seiji Tasaki, Takashi Ino, Kaoru Taketani, Shigeru Ishimoto, Masayasu Takeda, Takayuki Oku, Hiroshi Kira, Kouichi Hayashi, Hiroyuki Kimura, and Taku J. Sato
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Journal Title
EPJ Web of Conferences
Volume: 83
Pages: 03018-03018
DOI
Related Report
Peer Reviewed / Open Access / Acknowledgement Compliant
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[Journal Article] Concepts of Neutron Polarisation Analysis Devices for a New Neutron Chopper Spectrometer, POLANO, in J-PARC2014
Author(s)
K. Ohoyama, T. Yokoo, S. Itoh, T. Ino, M. Ohkawara, T. Oku, S. Tasaki, K. Iwasa, T. J. Sato, S. Ishimoto, K. Taketani, H. Kira, Y. Sakaguch, M. Nanbu, H. Hiraka, H. M. Shimizu, M. Takeda, M. Hino, K. Hayashi, M. Kenzelmann, U. Fliges, P. Hautle
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Journal Title
J. Phys.: Conf. Series
Volume: 502
Pages: 1-4
DOI
Related Report
Peer Reviewed / Open Access / Acknowledgement Compliant
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[Journal Article] Effects of Co Substitution on the Magnetic Excitation in Heavy Fermion Compound PrFe4P122014
Author(s)
Lijie Hao, Kazuaki Iwasa, Hiroki Kobayashi, Kenji Nakajima, Seiko Ohira-Kawamura, Tatsuya Kikuchi, Dongfeng Chen, Yuntao Liu, Zhongxiao Liu, Shiliang Li, Ding Hu
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Journal Title
JPS Conf. Proc.
Volume: 3
DOI
Related Report
Peer Reviewed / Acknowledgement Compliant
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[Journal Article] Neutron scattering study on f-electron states in PrCu4Au2014
Author(s)
Kazuaki Iwasa, Hiroki Kobayashi, Kotaro Saito, Keisuke Tomiyasu, Shuai Zhang, Yosikazu Isikawa, Jean-Michel Mignot, Gilles Andre, Daichi Kawana, Alexander I. Kolesnikov, Andrei T. Savici, Garrett E. Granroth
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Journal Title
JPS Conf. Proc.
Volume: 3
DOI
Related Report
Peer Reviewed / Acknowledgement Compliant
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[Journal Article] Newly Proposed Inelastic Neutron Spectrometer POLANO2013
Author(s)
Tetsuya Yokoo, Kenji Ohoyama, Shinichi Itoh, Junichi Suzuki, Kazuaki Iwasa, Taku J Sato, Hiroshi Kira, Yoshifumi Sakaguchi, Takashi Ino, Takayuki Oku, Keisuke Tomiyasu, Masato Matsuura, Haruhiro Hiraka, Masaki Fujita, Hiroyuki Kimura, Toyoto Sato, Junichi Suzuki, Masayasu Takeda, Koji Kaneko, Masahiro Hino, Suguru Muto
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Journal Title
J. Phys. Soc. Jpn. Supplement A
Volume: 82
Related Report
Peer Reviewed
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[Journal Article] Basic Concepts of Polarisation Analysis for Neutron Chopper Spectrometer POLANO at J-PARC2013
Author(s)
K. Ohoyama, T. Yokoo, S. Itoh, J. Suzuki, K. Iwasa, T. J. Sato, H. Kira, Y. Sakaguchi, T. Ino, T. Oku, K. Tomiyasu, M. Matsuura, H. Hiraka, M. Fujita, H. Kimura, T. Sato, J. Suzuki, H. M. Shimizu, T. Arima, M. Takeda, K. Kaneko, M. Hino, S. Muto, H. Nojiri, C. H. Lee, J. G. Park, S. Choi
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Journal Title
J. Phys. Soc. Jpn. Supplement A
Volume: 82
Related Report
Peer Reviewed
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[Presentation] Spin-state blockade in Te6+-substituted electron-doped LaCoO32015
Author(s)
Keisuke Tomiyasu, Shun-Ichi Koyama, Masanori Watahiki, Mika Sato, Kazuki Nishihara, Mitsugi Onodera, Kazuaki Iwasa, Tsutomu Nojima, Yuuichi Yamasaki, Hironori Nakao, Youichi Murakami
Organizer
APS March Meeting 2015
Place of Presentation
Henry B. Gonzalez Convention Center, San Antonio, Texas, USA
Year and Date
2015-03-02 – 2015-03-06
Related Report
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[Presentation] PrRu4P12の金属-非金属転移に対する元素置換効果の中性子・X線散乱による研究2014
Author(s)
岩佐和晃, 斉藤耕太郎, 佐藤貴宏, 米本在, , Lijie Hao, Claire Laulhe J.-M. Mignot, 中尾裕則, 村上洋一, 伊藤晋一, 横尾哲也, 川名大地
Organizer
東京大学物性研究所短期研究会「スクッテルダイト化合物及び関連物質を舞台とした強相関電子系物理の新展開」
Place of Presentation
東京大学物性研究所(柏キャンパス)(千葉県柏市)
Year and Date
2014-10-10 – 2014-10-12
Related Report
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[Presentation] Progress on POLANO Spectrometer for Polarized Neutron Experiment2014
Author(s)
T. Yokoo, K. Ohoyama, S. Itoh, K. Iwasa, N. Kaneko, M. Ohkawara, S. Tasaki, T. Ino, K. Taketani, S. Ishimoto, K. Aizawa, J. Suzuki, M. Nanbu, M. Takeda, T. Oku, K. Hayashi, H. Kimura, T. J. Sato
Organizer
ICANS XXI: International Collaboration on Advanced Neutron Sources
Place of Presentation
Ibaraki Prefectural Culture Center, Mito, Japan
Year and Date
2014-09-29 – 2014-10-03
Related Report
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[Presentation] Recent Progress on New Polarized Neutron Spectrometer POLANO2014
Author(s)
T. Yokoo, K. Ohoyama, S. Itoh, K. Iwasa, N. Kaneko, M. Okawara, S. Tasaki, T. Ino, K. Taketani, S. Ishimoto, K. Aizawa, J. Suzuki, M. Nanbu, M. Takeda, T. Oku, K. Hayashi, H. Kimura and T. J. Sato
Organizer
Polarised Neutrons for Condensed Matter Investigations 2014 (PNCMI 2014)
Place of Presentation
The Univrsity of Sydney, Sydney, Australia
Year and Date
2014-09-15 – 2014-09-19
Related Report
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[Presentation] Polarisation Analysis Neutron Spectrometer, POLANO, at J-PARC2014
Author(s)
K. Ohoyama, T. Yokoo, S. Itoh, K. Iwasa, M. Ohkawara, N. Kaneko, J. Suzuki, M. Nanbu, H. Hayashida, T. Ino, T. Oku, H. Kira, S. Tasaki, M. Takeda, K. Hayashi, H. Kimurai and T. J. Sato
Organizer
Polarised Neutrons for Condensed Matter Investigations 2014 (PNCMI 2014)
Place of Presentation
The Univrsity of Sydney, Sydney, Australia
Year and Date
2014-09-15 – 2014-09-19
Related Report
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[Presentation] Science from the initial operation of HRC2014
Author(s)
S. Itoh, T. Yokoo, T. Masuda, H. Yoshizawa, M. Soda, Y. Ikeda, D. Kawana, T. J. Sato, Y. Nambu, K. Kuwahara, S. Yano, J. Akimitsu, Y. Kaneko, Y. Tokura, M. Fujita, M. Hase, K. Iwasa, H. Hiraka, T. Fukuda, K. Ikeuchi, K. Yoshida, T. Yamaguchi, K. Ono, Y. Endoh
Organizer
The 2nd International Symposium on Science at J-PARC (J-PARC 2014)
Place of Presentation
つくば国際会議場(つくば市)
Year and Date
2014-07-12 – 2014-07-15
Related Report
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[Presentation] Polarised Neutron Spectrometer POLANO in J-PARC2014
Author(s)
K. Ohoyama, T. Yokoo, S. Itoh, K. Iwasa, M. Ohkawara, N. Kaneko, J. Suzuki, M. Nanbu, H. Hayashida, T. Ino, T. Oku, H. Kira, S. TasakiFukuda, K. Ikeuchi, K. Yoshida, T. Yamaguchi, K. Ono, Y. Endoh
Organizer
The 2nd International Symposium on Science at J-PARC (J-PARC 2014)
Place of Presentation
つくば国際会議場(つくば市)
Year and Date
2014-07-12 – 2014-07-15
Related Report
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[Presentation] Polarized neutron spectrometer for inelastic scattering experiments at J-PARC ~ Status of POLANO project ~2014
Author(s)
T. Yokoo, K. Ohoyama, S. Itoh, K. Iwasa, N. Kaneko, J. Suzuki, M. Ohkawara, K. Aizawa, S. Tasaki, T. Ino, K. Taketani, S. Ishimoto, M. Takeda, T. Oku, H. Kira, S. Satoh, K. Hayashi, H. Kimura and T. J. Sato
Organizer
International Conference on Quasielastic Neutron Scattering and Workshop on Inelastic Neutron Spectrometers (QENS2014/WINS2014)
Place of Presentation
L'Escandille, Autrans, France
Year and Date
2014-05-11 – 2014-05-16
Related Report
Invited
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[Presentation] Development of a Polarised Neutron Diffraction System with a 3He Spin Filter on a Powder Diffractometer in JRR-32012
Author(s)
K. Ohoyama, K. Tsutsumi, T. Ino, H. Hiraka, Y. Yamaguchi, H. Kira, T. Oku, Y. Sakaguchi, Y. Arimoto, W. Zhang, H. Kimura, K. Iwasa, M. Takeda, J. Suzuki, K. Yamada, K. Kakurai
Organizer
PNCMI'2012 (9th International workshop on Polarised Neutrons in Condensed Matter Investigations)
Place of Presentation
Jean Monnet center, Paris, France
Related Report
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[Presentation] Detection of orbital wave in YVO3 using inelastic neutron scattering2012
Author(s)
Daichi Kawana, Youichi Murakami, Tetsuya Yokoo, Shinichi Itoh, Andrei T. Savici, Garrett E. Granroth, Kazuhiko Ikeuchi, Hironori Nakao, Kazuaki Iwasa 他
Organizer
Detection of orbital wave in YVO3 using inelastic neutron scattering The 19th International Conference on Magnetism
Place of Presentation
BEXCO, Busan, Korea
Related Report
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[Presentation] Newly Proposed Inelastic Neutron Spectrometer POLANO2012
Author(s)
T. Yokoo, K. Ohoyama, S. Itoh, J. Suzuki, K. Iwasa 他
Organizer
QENS2012/WINS2012, Nikko Joint Conference between 10th International Conference on Quasielastic Neutron Scattering and 5th Workshop on Inelastic Neutron Spectrometers
Place of Presentation
Nikko Sogo Kaikan, Tochigi, Japan
Related Report
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