Anisotropic Superconducting Properties of Kagome Metal CsV_3Sb_5  

作　　者：Shunli Ni Sheng Ma Yuhang Zhang Jie Yuan Haitao Yang Zouyouwei Lu Ningning Wang Jianping Sun Zhen Zhao Dong Li Shaobo Liu Hua Zhang Hui Chen Kui Jin Jinguang Cheng Li Yu Fang Zhou Xiaoli Dong Jiangping Hu Hong-Jun Gao Zhongxian Zhao 倪顺利;马晟;张宇航;袁洁;杨海涛;鲁邹有为;王宁宁;孙建平;赵振;李栋;刘少博;张华;陈辉;金魁;程金光;俞理;周放;董晓莉;胡江平;高鸿钧;赵忠贤(Beijing National Laboratory for Condensed Matter Physics and Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China;University of Chinese Academy of Sciences,Beijing 100049,China;CAS Center for Excellence in Topological Quantum Computation,University of Chinese Academy of Sciences,Beijing 100190,China;Kavli Institute of Theoretical Sciences,University of Chinese Academy of Sciences,Beijing 100190,China;Songshan Lake Materials Laboratory,Dongguan 523808,China)

机构地区：[1]Beijing National Laboratory for Condensed Matter Physics and Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China [2]University of Chinese Academy of Sciences,Beijing 100049,China [3]CAS Center for Excellence in Topological Quantum Computation,University of Chinese Academy of Sciences,Beijing 100190,China [4]Kavli Institute of Theoretical Sciences,University of Chinese Academy of Sciences,Beijing 100190,China [5]Songshan Lake Materials Laboratory,Dongguan 523808,China

出　　处：《Chinese Physics Letters》2021年第5期121-125,共5页中国物理快报（英文版）

基　　金：Supported by the National Natural Science Foundation of China (Grant Nos.11834016,11888101,12061131005,51771224 and61888102);the National Key Research and Development Projects of China (Grant Nos.2017YFA0303003 and 2018YFA0305800);the Key Research Program and Strategic Priority Research Program of Frontier Sciences of the Chinese Academy of Sciences (Grant Nos.QYZDY-SSW-SLH001,XDB33010200 and XDB25000000)。

摘　　要：We systematically measure the superconducting(SC)and mixed state properties of high-quality CsV_3 Sb_5 single crystals with T_c-3.5 K.We find that the upper critical field H_(c2)(T)exhibits a large anisotropic ratio of H_(c2)^(ab)/H_(c2)^c^9 at zero temperature and fitting its temperature dependence requires a minimum two-band effective model.Moreover,the ratio of the lower critical field,H_(c1)^(ab)/H_(c1)^c,is also found to be larger than 1,which indicates that the in-plane energy dispersion is strongly renormalized near Fermi energy.Both H_(c1)(T)and SC diamagnetic signal are found to change little initially below T_c-3.5 K and then to increase abruptly upon cooling to a characteristic temperature of-2.8 K.Furthermore,we identify a two-fold anisotropy of in-plane angular-dependent magnetoresistance in the mixed state.Interestingly,we find that,below the same characteristic T-2.8 K,the orientation of this two-fold anisotropy displays a peculiar twist by an angle of 60°characteristic of the Kagome geometry.Our results suggest an intriguing superconducting state emerging in the complex environment of Kagome lattice,which,at least,is partially driven by electron-electron correlation.

关 键 词：Anisotropic Superconducting Properties of Kagome Metal CsV_3Sb_5 KAGOME 

分 类 号：O469[理学—凝聚态物理]