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2020 Fiscal Year Final Research Report

Phase diagram, electronic structure, and superconductivity of iron-based superconductors

Research Project

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Project/Area Number 17K05556
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Condensed matter physics II
Research InstitutionNational Institute for Materials Science

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)

Project Period (FY) 2017-04-01 – 2021-03-31
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
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.

Free Research Field

固体物理

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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Published: 2022-01-27  

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