首页|Anisotropic s-Wave Gap in the Vicinity of a Quantum Critical Point in Superconducting BaFe2(As1-xPx)2 Single Crystals:A Study of Point-Contact Spectroscopy
Anisotropic s-Wave Gap in the Vicinity of a Quantum Critical Point in Superconducting BaFe2(As1-xPx)2 Single Crystals:A Study of Point-Contact Spectroscopy
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We report on soft c-axis point-contact Andreev reflection(PCAR)spectroscopy combining with resistivity measurements on BaFe2(As0.7P0.3)2,to elucidate the superconducting gap structure in the vicinity of the quan-tum critical point.A double peak at the gap edge plus a dip feature at zero-bias has been observed on the PCAR spectra,indicative of the presence of a nodeless gap in BaFe2(As0.7P0.3)2.Detailed analysis within a sophisticated theoretical model reveals an anisotropic gap with deep gap minima.The PCARs also feature ad-ditional structures related to the electron-bosonic coupling mode.Using the extracted superconducting energy gap value,a characteristic bosonic energy Ωb and its temperature dependence are obtained,comparable with the spin-resonance energy observed in neutron scattering experiment.These results indicate a magnetism-driven quantum critical point in the BaFe2(As1-xPx)2 system.
詹红星、林玉尺、赵宇清、左海艳、王兴玉、马肖燕、李春红、罗会仟、陈根富、李世亮、任聪
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School of Physics and Astronomy,Yunnan University,Kunming 650500,China
Beijing National Laboratory for Condensed Matter Physics,and Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China
Yunnan Key Laboratory for Electromagnetic Materials and Devices,Yunnan University,Kunming 650500,China
国家自然科学基金国家自然科学基金国家重点研发计划国家重点研发计划国家重点研发计划中国科学院项目中国科学院项目Joint Fund of Yunnan Provincial Science and Technology Department
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