2021 Fiscal Year Final Research Report
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 |
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| Section | 一般 |
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| Review Section |
Basic Section 32010:Fundamental physical chemistry-related
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| Research Institution | Okayama University |
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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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| 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 |
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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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| Free Research Field |
固体物理化学
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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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