Pressure-induced superconductivity in carried doped two-dimensional layered materials
Project/Area Number |
19H02676
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Research Category |
Grant-in-Aid for Scientific Research (B)
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Allocation Type | Single-year Grants |
Section | 一般 |
Review Section |
Basic Section 32010:Fundamental physical chemistry-related
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Research Institution | Okayama University |
Principal Investigator |
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Co-Investigator(Kenkyū-buntansha) |
JESCHKE HARALD 岡山大学, 異分野基礎科学研究所, 特任教授 (10800211)
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Project Period (FY) |
2019-04-01 – 2022-03-31
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Project Status |
Completed (Fiscal Year 2021)
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Budget Amount *help |
¥17,550,000 (Direct Cost: ¥13,500,000、Indirect Cost: ¥4,050,000)
Fiscal Year 2021: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2020: ¥6,760,000 (Direct Cost: ¥5,200,000、Indirect Cost: ¥1,560,000)
Fiscal Year 2019: ¥8,970,000 (Direct Cost: ¥6,900,000、Indirect Cost: ¥2,070,000)
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Keywords | 超伝導 / 圧力 / トポロジカル絶縁体 / ディラック半金属 / 2次元層状物質 / キャリアドーピング / キャリア注入 / 2次元層状物質 / トポロジカル物質 / 圧力印加 / 超伝導特性 / 圧力誘起超伝導 / ワイル半金属 / 高圧下結晶構造 / 高圧下電気抵抗測定 / 結晶構造 / 電子構造 |
Outline of Research at the Start |
本研究では、キャリアがドープされた多様な2次元層状物質における新規な超伝導相を、常圧から200 GPaの圧力領域において実現する。第一に、金属ドーピングを通じて、キャリア注入された「鉄カルコゲナイド化合物・トポロジカル絶縁体・Dirac半金属・Weyl半金属」などの物質系を合成し、新規な電子相を実現する。この物質に対して圧力を印加して、結晶構造・磁気特性・電気特性・ホール効果を調べて、圧力下での超伝導相を探索する。さらに、得られた超伝導と、構造ならびに電子状態との相関を明らかにする。この研究を通じて、圧力により新規な超伝導相を生み出す構造的・電子的な要因を明らかにする。
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Outline of Final Research Achievements |
The superconducting properties of various superconductors prepared by carrier doping of two dimensional materials were investigated in a wide pressure range. In particular, the superconducting properties of metal doped FeSe and Ba1-xMxTi2(Sb1-yBiy)2O were investigated under pressure. The pressure-induced superconductivity in topological insulators which are not superconductors at ambient pressure was also confirmed. The emergence of superconductivity was correlated with the structural phase transition.The onset pressure, where the superconductivity appears, of topological insulator Bi2-xSbxTe3-ySey in which the Fermi level was tuned with x and y, changes systematically. Multiple superconducting phases were confirmed in Bi2-xSbxTe3-ySey under pressure, and each superconducting phase is correlated with specified crystal structure.
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Academic Significance and Societal Importance of the Research Achievements |
本研究課題を通じて、2次元層状物質へのキャリアドーピングによって作製された多数の超伝導物質の圧力下での超伝導挙動が解明されるとともに、常圧では超伝導体ではないトポロジカル絶縁体における圧力誘起超伝導相の発見を行うことができた。また、その超伝導特性が、圧力下での結晶構造変化と大きく相関することなども明らかにした。この研究は、多様な2次元層状物質の圧力下での超伝導と結晶構造を明らかにしたということで、超伝導物性化学の発展に大きく貢献するとともに、圧力が、トポロジカル絶縁体を始めとする2次元層状物質の興味深い物理を創出できるということを示した点で学術的に評価できる。
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Report
(4 results)
Research Products
(40 results)
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[Journal Article] Superconductivuty of topological insulator Sb2Te3-ySey under pressure2021
Author(s)
T. Taguchi, M. Ikeda, H. Li, A. Suzuki, X. Yang, H. Ishii, Y.-F. Liao, H. Ota, H. Goto, R. Eguchi, Y. Kubozono
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Journal Title
Journal of Physics: Condensed Matter
Volume: 33
Issue: 48
Pages: 485704-485704
DOI
Related Report
Peer Reviewed / Int'l Joint Research
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[Journal Article] A new protocol for the preparation of superconducting KBi22020
Author(s)
Li Huan、Wang Yanan、Aoki Yutaro、Nishiyama Saki、Yang Xiaofan、Taguchi Tomoya、Miura Akari、Suzuki Ai、Zhi Lei、Goto Hidenori、Eguchi Ritsuko、Kambe Takashi、Liao Yen-Fa、Ishii Hirofumi、Kubozono Yoshihiro
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Journal Title
RSC Advances
Volume: 10
Issue: 45
Pages: 26686-26692
DOI
NAID
Related Report
Peer Reviewed / Open Access / Int'l Joint Research
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[Journal Article] Superconducting behavior of a new metal iridate compound, SrIr2, under pressure2020
Author(s)
Xiaofan Yang, Huan Li, Tong He, Tomoya Taguchi, Yanan Wang, Hidenori Goto, Ritsuko Eguchi, Rie Horie, Kazumasa Horigane, Kaya Kobayashi, Jun Akimitsu, Hirofumi Ishii, Yen Fa Liao, Hitoshi Yamaoka, Yoshihiro Kubozono
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Journal Title
Journal of Physics Condensed Matter
Volume: 32
Issue: 2
Pages: 025704-025704
DOI
Related Report
Peer Reviewed / Int'l Joint Research
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[Journal Article] Inhomogeneous superconductivity in thin crystals of FeSe1-xTex (x=1.0, 0.95, and 0.9)2020
Author(s)
Ritsuko Eguchi, Megumi Senda, Eri Uesugi, Hidenori Goto, Akihiko Fujiwara, Yasuhiko Imai, Shigeru Kimura, Takashi Noji, Yoji Koike, Yoshihiro Kubozono
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Journal Title
Materials Research Express
Volume: 7
Issue: 3
Pages: 036001-036001
DOI
NAID
Related Report
Peer Reviewed / Open Access
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[Journal Article] Pressure-induced superconductivity in Bi2-xSbxTe3-ySey2019
Author(s)
Tong He, Xiaofan Yang, Tomoya Taguchi, Teppei Ueno, Kaya Kobayashi, Jun Akimitsu, Hitoshi Yamaoka, Hirofumi Ishii, Yen-Fa Liao, Hiromi Ota, Hidenori Goto, Ritsuko Eguchi, Kensei Terashima, Takayoshi Yokoya, Harald O. Jeschke, Xianxin Wu, Yoshihiro Kubozono
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Journal Title
PHYSICAL REVIEW B
Volume: 100
Issue: 9
Pages: 094525-094525
DOI
Related Report
Peer Reviewed / Int'l Joint Research
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[Journal Article] Superconductivity in a new layered triangular-lattice system Li2IrSi22019
Author(s)
K. Horigane, K. Takeuchi, D. Hyakumura, R. Horie, T. Sato, T. Muranaka, K. Kawashima, H. Ishii H, Y. Kubozono, S. Orimo, M. Isobe, J. Akimitsu
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Journal Title
New Journal of Physics
Volume: 21
Issue: 9
Pages: 093056-093056
DOI
Related Report
Peer Reviewed / Open Access
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[Journal Article] Preparation and characterization of superconducting Ba1-xCsxTi2Sb2O, and its pressure dependence of superconductivity2019
Author(s)
Wang Yanan, Yang Xiaofan, Taguchi Tomoya, Li Huan, He Tong, Goto Hidenori, Eguchi Ritsuko, Miyazaki Takafumi, Liao Yen-Fa, Ishii Hirofumi, Kubozono Yoshihiro
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Journal Title
JAPANESE JOURNAL OF APPLIED PHYSICS
Volume: 58
Issue: 11
Pages: 110603-110603
DOI
NAID
Related Report
Peer Reviewed / Open Access / Int'l Joint Research
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