Two-fold symmetry of the in-plane resistance in kagome superconductor Cs(V_(1-x)Ta_(x))_(3)Sb_(5) with enhanced superconductivity

作     者：赵振 王汝文 张宇航 祝轲 余维琪 韩烨超 刘家利 胡国静 郭辉 林晓 董晓莉 陈辉 杨海涛 高鸿钧 Zhen Zhao;Ruwen Wang;Yuhang Zhang;Ke Zhu;Weiqi Yu;Yechao Han;Jiali Liu;Guojing Hu;Hui Guo;Xiao Lin;Xiaoli Dong;Hui Chen;Haitao Yang;Hong-Jun Gao

作者机构：Beijing National Center for Condensed Matter Physics and Institute of PhysicsChinese Academy of SciencesBeijing 100190China School of Physical SciencesUniversity of Chinese Academy of SciencesBeijing 100049China Songshan Lake Materials LaboratoryDongguan 523808China 

出 版 物：《Chinese Physics B》 (中国物理B（英文版）)

年 卷 期：2024年第33卷第7期

页      面：9-14页

核心收录：

学科分类：07[理学] 070205[理学-凝聚态物理] 0702[理学-物理学] 

基　　金：Project supported by the National Key R&D Program of China(Grant No.2022YFA1204100) the National Natural Science Foundation of China(Grant No.62488201) the Chinese Academy of Sciences(Grant Nos.XDB33030000,ZDBS-SSW-WHC001,YSBR-003,and YSBR-053) Innovation Program of Quantum Science and Technology(Grant No.2021ZD0302700) 

主　　题：kagome superconductor charge density wave rotation symmetry breaking 

摘      要：The kagome superconductor CsV_(3)Sb_(5) has attracted widespread attention due to its rich correlated electron states including superconductivity, charge density wave(CDW), nematicity, and pair density wave. Notably, the modulation of the intertwined electronic orders by the chemical doping is significant to illuminate the cooperation/competition between multiple phases in kagome superconductors. In this study, we have synthesized a series of tantalum-substituted Cs(V_(1-x)Ta_(x))_(3)Sb_(5) by a modified self-flux method. Electrical transport measurements reveal that CDW is suppressed gradually and becomes undetectable as the doping content of x is over 0.07. Concurrently, the superconductivity is enhanced monotonically from T_(c) ~ 2.8 K at x = 0 to 5.2 K at x = 0.12. Intriguingly, in the absence of CDW, Cs(V_(1-x)Ta_(x))_(3)Sb_(5)(x = 0.12) crystals exhibit a pronounced two-fold symmetry of the in-plane angular-dependent magnetoresistance(AMR) in the superconducting state, indicating the anisotropic superconducting properties in the Cs(V_(1-x)Ta_(x))_(3)Sb_(5). Our findings demonstrate that Cs(V_(1-x)Ta_(x))_(3)Sb_(5) with the non-trivial band topology is an excellent platform to explore the superconductivity mechanism and intertwined electronic orders in quantum materials.