Origin of ferroelectric-like metal state in superconducting parent phase
Project/Area Number |
16K05434
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Research Category |
Grant-in-Aid for Scientific Research (C)
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Allocation Type | Multi-year Fund |
Section | 一般 |
Research Field |
Condensed matter physics II
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Research Institution | Tokyo Institute of Technology |
Principal Investigator |
Yamaura Junichi 東京工業大学, 元素戦略研究センター, 特任准教授 (80292762)
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Project Period (FY) |
2016-04-01 – 2020-03-31
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Project Status |
Completed (Fiscal Year 2019)
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Budget Amount *help |
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2018: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2017: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2016: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
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Keywords | 鉄系超伝導 / 強誘電金属 / ネマチック状態 / ネマチック揺らぎ / 構造ゆらぎ / 超伝導 / 構造秩序 / 磁気秩序 |
Outline of Final Research Achievements |
A hydrogen-substituted iron-based superconductor has a unique parent phase that loses spatial inversion symmetry and a superconducting phase adjacent to it. Since the superconducting phase is regarded as the fluctuations of superconductivity are ordered, the relationship between fluctuations in the ferroelectric metallic state and superconductivity is interesting. From the X-ray diffraction in LaFeAsO1-xHx, we found that the lattice symmetry lowering -nematic state- from a much higher temperature of the parent phase. From EXAFS measurement, we discovered that there is a local inversion symmetry breaking -ferroelectric fluctuation- from a much higher temperature region. This result suggests that the fluctuation of polar metal may be related to superconductivity.
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Academic Significance and Societal Importance of the Research Achievements |
本研究成果は、最近多くの超伝導体で観測されているネマチック状態が、水素置換系鉄系超伝導体でも存在していることを新たに証明し、さらに、超伝導体全体でも未知といえる、強誘電的金属状態の揺らぎと超伝導の関連を見出した重要な意義がある。また、反転対称を破った構造における超伝導は、上部臨界磁場の理論的限界値を上げる可能性があり、超伝導体の応用という面でも重要な情報を提供できると考えている。
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Report
(5 results)
Research Products
(34 results)
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[Journal Article] Quantum dynamics of hydrogen in the iron-based superconductor LaFeAsO0.9D0.1 measured with inelastic neutron spectroscopy2019
Author(s)
Jun-ichi Yamaura, Haruhiro Hiraka, Soshi Iimura, Yoshinori Muraba, Joonho Bang, Kazuhiko Ikeuchi, Mitsutaka Nakamura, Yasuhiro Inamura, Takashi Honda, Masatoshi Hiraishi, Kenji M. Kojima, Ryosuke Kadono, Yoshio Kuramoto, Youichi Murakami, Satoru Matsuishi, and Hideo Hosono
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Journal Title
Phys. Rev. B
Volume: 99
Issue: 22
DOI
NAID
Related Report
Peer Reviewed / Open Access
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[Journal Article] Gapless magnetic excitation in a heavily electron-doped antiferromagnetic phase of LaFeAsO0.5D0.52018
Author(s)
H. Tamatsukuri, H. Hiraka, K. Ikeuchi, S. Iimura, Y. Muraba, M. Nakamura, H. Sagayama, J. Yamaura, Y. Murakami, Y. Kuramoto, and H. Hosono
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Journal Title
Phys. Rev. B.
Volume: 98
Issue: 17
Pages: 1744151-1744156
DOI
NAID
Related Report
Peer Reviewed
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[Journal Article] 4.Strong Spin-Phonon Coupling Mediated by Single Ion Anisotropy in the All-In--All-Out Pyrochlore Magnet Cd2Os2O72017
Author(s)
C. H. Sohn, C. H. Kim, L. J. Sandilands, N. M. Hien, S. Y. Kim, H. J. Park, K. W. Kim, S. J. Moon, J. Yamaura, Z. Hiroi, and T. W. Noh
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Journal Title
Phys. Rev. Lett.
Volume: 118
Issue: 11
Pages: 117201-117201
DOI
Related Report
Peer Reviewed / Int'l Joint Research
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[Presentation] Ba1-xLaxFe2As2薄膜の結晶構造2017
Author(s)
小林賢介, 中尾朗子, 真木祥千子, 山浦淳一, 片瀬貴義, 佐藤光, 佐賀山基, 熊井玲児, 村上洋一, 平松秀典, 細野秀雄
Organizer
日本物理学会
Place of Presentation
大阪大学
Year and Date
2017-03-17
Related Report
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