Phase diagram, electronic structure, and superconductivity of iron-based superconductors
| Project/Area Number |
17K05556
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | 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 | National Institute for Materials Science |
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Principal Investigator |
TERASHIMA Taichi 国立研究開発法人物質・材料研究機構, 国際ナノアーキテクトニクス研究拠点, グループリーダー (40343834)
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| Project Period (FY) |
2017-04-01 – 2021-03-31
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| Project Status |
Completed (Fiscal Year 2020)
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| Budget Amount *help |
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2019: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2018: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2017: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
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| Keywords | 鉄系超伝導体 / 量子振動 / フェルミ面 / ピーク効果 / 弾性抵抗 / ネマチック揺らぎ / ネマチック / elastoresistivity / 磁気トルク / QSGW法 / ディラック電子 / ベリー位相 / 超伝導材料 / 物性実験 / 強相関電子系 |
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| Outline of Final Research Achievements |
(1)The Fermi surface in an iron-based superconductor parent compound CaFeAsF and an iron-based superconductor compound FeS was determined via quantum-oscillation measurements. The existence of Dirac fermions in CaFeAsF was established from the analysis of the oscillation phase.
(2) The magnetic torque in iron-based superconductor parent compounds Ba1-xKxFe2As2(X ~ 0.69, 0.76) was measured. A pronounced peak effect was observed, and a first-order-transition-like jump of the torque was observed.
(3) Elastoresistance measurements on iron-based superconductor parent compounds Ba0.5K0.5Fe2As2, CaKFe4As4, and KCa2Fe4As4F2 were performed. All the three compounds exhibit a pronounced enhancement of elestoresistance as the temperature is lowered.
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| Academic Significance and Societal Importance of the Research Achievements |
2008年に東工大・細野教授らの報告した鉄系超伝導体は、銅酸化物超伝導体に次ぐ高い超伝導転移温度を持ち、実用化に期待が持たれている。一方で、より高い転移温度を実現するために、超伝導発現機構解明のための基礎研究も盛んに進められている。本研究では、金属の電子状態を理解するために最も基礎となるフェルミ面を、量子振動測定により決定すること。elastoresistanceと呼ばれる測定により電子状態の異方性を明らかにすること。線材応用にとって重要な磁束のピン止めに関連するピーク効果を調べることなどを実施して、鉄系超伝導体の基礎的理解を深めることに努めた。
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Report
(5 results)
Research Products
(23 results)
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[Journal Article] Accurate determination of the Fermi surface of tetragonal FeS via quantum oscillation measurements and quasiparticle self-consistent GW calculations2019
Author(s)
Taichi Terashima, Naoki Kikugawa, David Graf, Hishiro T. Hirose, Shinya Uji, Yoshitaka Matsushita, Hai Lin, Xiyu Zhu, Hai-Hu Wen, Takuya Nomoto, Katsuhiro Suzuki, and Hiroaki Ikeda
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Journal Title
Phys. Rev. B
Volume: 99
Issue: 13
Pages: 134501-134501
DOI
Related Report
Peer Reviewed / Int'l Joint Research
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