Experimental investigation of the suppressed superconducting gap and double-resonance mode in Ba $_{1-x}$ K $_{x}$ Fe $_{2}$ As $_{2}$

Ideta, Shinichiro*; Murai, Naoki ; Nakajima, Masamichi*; Kajimoto, Ryoichi ; Tanaka, Kiyohisa*

Ba $_{1-x}$ K $_{x}$ Fe $_{2}$ As $_{2}$ has an exotic physical property where that the C $_{2}$ -SDW phase suddenly changes to the C $_{4}$ -magnetic phase and superconductivity is suppressed within a narrow composition range around x = 0.25. We have investigated the doping dependence of the electronic structure of Ba $_{1-x}$ K $_{x}$ Fe $_{2}$ As $_{2}$ using angle-resolved photoemission spectroscopy (ARPES) and found an anomaly in the superconducting (SC) gap structure only for x = 0.25 in both the hole and electron Fermi surfaces (FSs). We also propose that the mechanism of a newly observed double-resonance peak by inelastic neutron scattering is understandable by the SC gap obtained by ARPES. Our discovery reveals the important relationship between the C $_{4}$ - magnetic phase and superconductivity, and provides an opportunity to survey the underlying relationship between the SC gap and resonance mode in the hole-doped iron-based superconductor.

Language	:	English
Journal	:	Physical Review B
Volume	:	100
Number	:	23
Pages	:	p.235135_1 - 235135_7
Publication Year/Month	:	2019/12
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Paper URL	:	https://doi.org/10.1103/PhysRevB.100.235135
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Keywords	:	超伝導; 電子状態; スピンダイナミクス
Research Facility	:	J-PARC物質・生命科学実験施設
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Article of JAEA R&D Review	:
Cooperating Institute	:	大阪大学; 分子科学研究所

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Registration No. : AA20190493
JAEA Abstracts No. : 48000237
Paper Submission No. : 22577

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Experimental investigation of the suppressed superconducting gap and double-resonance mode in BaKFeAs

Experimental investigation of the suppressed superconducting gap and double-resonance mode in Ba $_{1-x}$ K $_{x}$ Fe $_{2}$ As $_{2}$