1 Beijing National Center for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China; 2 School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China; 3 Songshan Lake Materials Laboratory, Dongguan 523808, China
Abstract The kagome superconductor CsVSb 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(VTa)Sb by a modified self-flux method. Electrical transport measurements reveal that CDW is suppressed gradually and becomes undetectable as the doping content of is over 0.07. Concurrently, the superconductivity is enhanced monotonically from K at to 5.2 K at . Intriguingly, in the absence of CDW, Cs(VTa)Sb () 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(VTa)Sb. Our findings demonstrate that Cs(VTa)Sb with the non-trivial band topology is an excellent platform to explore the superconductivity mechanism and intertwined electronic orders in quantum materials.
Fund: 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), and Innovation Program of Quantum Science and Technology (Grant No. 2021ZD0302700).
Corresponding Authors:
Haitao Yang
E-mail: htyang@iphy.ac.cn
Cite this article:
Zhen Zhao(赵振), Ruwen Wang(王汝文), Yuhang Zhang(张宇航), Ke Zhu(祝轲), Weiqi Yu(余维琪), Yechao Han(韩烨超), Jiali Liu(刘家利), Guojing Hu(胡国静), Hui Guo(郭辉), Xiao Lin(林晓), Xiaoli Dong(董晓莉), Hui Chen(陈辉), Haitao Yang(杨海涛), and Hong-Jun Gao(高鸿钧) Two-fold symmetry of the in-plane resistance in kagome superconductor Cs(V1-xTax)3Sb5 with enhanced superconductivity 2024 Chin. Phys. B 33 077406
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