Emergent superconducting fluctuations in compressed kagome superconductor CsV_(3)Sb_(5)

作     者：Xikai Wen Fanghang Yu Zhigang Gui Yuqing Zhang Xingyuan Hou Lei Shan Tao Wu Ziji Xiang Zhenyu Wang Jianjun Ying Xianhui Chen 

作者机构：Department of Physicsand CAS Key Laboratory of Strongly-coupled Quantum Matter PhysicsUniversity of Science and Technology of ChinaHefei 230026China CAS Center for Excellence in Quantum Information and Quantum PhysicsHefei 230026China Information Materials and Intelligent Sensing Laboratory of Anhui ProvinceInstitutes of Physical Science and Information TechnologyAnhui UniversityHefei 230601China Key Laboratory of Structure and Functional Regulation of Hybrid Materials of Ministry of EducationAnhui UniversityHefei 230601China 

出 版 物：《Science Bulletin》 (科学通报（英文版）)

年 卷 期：2023年第68卷第3期

页      面：259-265,M0003页

核心收录：

学科分类：07[理学] 070201[理学-理论物理] 0702[理学-物理学] 

基　　金：supported by the National Natural Science Foundation of China(11888101 and 11534010) the National Key Research and Development Program of the Ministry of Science and Technology of China(2017YFA0303001 and 2019YFA0704900) the Anhui Initiative in Quantum Information Technologies(AHY160000) the Science Challenge Project of China(TZ2016004) the Key Research Program of Frontier Sciences,CAS,China(QYZDYSSWSLH021) the Strategic Priority Research Program of the Chinese Academy of Sciences(XDB25000000) the Collaborative Innovation Program of Hefei Science Center,CAS(2020HSC-CIP014) the Fundamental Research Funds for the Central Universities(WK3510000011) 

主　　题：Kagome superconductor Superconducting fluctuations Charge density wave 

摘      要：The recent discovery of superconductivity(SC)and charge density wave(CDW)in kagome metals AV3Sb5(A=K,Rb,Cs)provides an ideal playground for the study of emergent electronic *** of moderate pressure leads to a two-dome-shaped SC phase regime in CsV_(3)Sb_(5) accompanied by the destabilizing of CDW ***,the nature of this pressure-tuned SC state and its interplay with the CDW are yet to be ***,we perform soft point-contact spectroscopy(SPCS)measurements in CsV_(3)Sb_(5) to investigate the evolution of superconducting order parameter with ***,we find that the superconducting gap is significantly enhanced between the two SC domes,at which the zero-resistance temperature is suppressed and the transition is remarkably ***,the temperature-dependence of the SC gap in this pressure range severely deviates from the conventional Bardeen-Cooper-Schrieffer(BCS)behavior,evidencing for strong Cooper pair phase *** findings reveal the complex intertwining of the CDW with SC in the compressed CsV_(3)Sb_(5),suggesting striking parallel to the cuprate superconductor La2
*** results point to the essential role of charge degree of freedom in the development of intertwining electronic orders,and thus provide new constraints for theories.