2016 Fiscal Year Final Research Report
Superconductivity in Ca-Fe-As ternary systems
| Project/Area Number |
26287082
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Partial Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Condensed matter physics II
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| Research Institution | Okayama University |
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Principal Investigator |
Nohara Minoru 岡山大学, 異分野基礎科学研究所, 教授 (70272531)
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| Co-Investigator(Renkei-kenkyūsha) |
KUDO Kazutaka 岡山大学, 異分野基礎科学研究所, 准教授 (40361175)
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| Project Period (FY) |
2014-04-01 – 2017-03-31
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| Keywords | 鉄系超伝導体 / 物質開発 / ヒ素の化学 |
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| Outline of Final Research Achievements |
We have investigated the 112-type CaFeAs2 and experimentally demonstrated: (1) superconducting transition temperature is increased up to 47 K by the La and Sb simultaneous doping, (2) the doped Sb does not substitute for As at superconducting FeAs layers, but for As at interlayer substances, and (3) antiferromangetic ordering appears by heavy La doping of CaFeAs2. We also have investigated the 10-4-8-type Ca10(Ir4As8)(Fe2As2)5 and demonstrated: (4) the compound experiences a structural phase transition (SPT) at approximately 100 K, (5) the SPT is suppressed under a hydrostatic pressure of 0.5 GPa, which is associated with disappearance of superconductivity, and (6) Ir 5d orbitals contribute to charge transport.
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| Free Research Field |
固体物理
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