首页|Superconducting state in Ba(1-x)SrxNi2As2 near the quantum critical point

Superconducting state in Ba(1-x)SrxNi2As2 near the quantum critical point

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In the phase diagram of the nickel-based superconductor Ba1-xSrvNi2As2,Tc has been found to be enhanced sixfold near the quantum critical point(QCP)x=0.71 compared with the parent compound.However,the mechanism is still under debate.Here,we report a detailed investigation of the superconducting properties near the QCP(x ≈ 0.7)by utilizing scanning tunneling microscopy and spectroscopy.The temperature-dependent superconducting gap and magnetic vortex state were obtained and analyzed in the framework of the Bardeen-Cooper-Schrieffer model.The ideal isotropic s-wave superconducting gap excludes the long-speculated nematic fluctuations while preferring strong electron-phonon coupling as the mechanism for Tc enhancement near the QCP.The lower than expected gap ratio of Δ/(kBTc)is rooted in the fact that Ba1-xSrxNi2As2 falls into the dirty limit with a serious pair breaking effect similar to the parent compound.

nickel-based superconductorelectron-phonon couplingdirty limitscanning tunneling mi-croscopy/spectroscopy

余承峰、张宗源、宋林兴、吴彦玮、袁小秋、侯杰、涂玉兵、侯兴元、李世亮、单磊

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Information Materials and Intelligent Sensing Laboratory of Anhui Province,Institutes of Physical Science and Information Technology,Anhui University,Hefei 230601,China

Key Laboratory of Structure and Functional Regulation of Hybrid Materials(Anhui University),Ministry of Education,Hefei 230601,China

Beijing National Laboratory for Condensed Matter Physics,Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China

School of Physical Sciences,University of Chinese Academy of Sciences,Beijing 100190,China

Songshan Lake Materials Laboratory,Dongguan 523808,China

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国家重点研发计划国家重点研发计划国家重点研发计划Innovation Program for Quantum Science and Technology国家自然科学基金国家自然科学基金国家自然科学基金国家自然科学基金中国科学院项目中国科学院项目Major Basic Program of Natural Science Foundation of Shandong Province

2022YFA14032032022YFA14034002021YFA14004002021ZD030280212074002121040041220400812374133XDB33000000GJTD-2020-01ZR2021ZD01

2024

10.1088/1674-1056/ad334a

中国物理B(英文版)
中国物理学会和中国科学院物理研究所

中国物理B(英文版)

CSTPCDEI
影响因子：0.995
ISSN：1674-1056
年,卷(期)：2024.33(6)
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