Two-fold symmetry of the in-plane resistance in kagome superconductor Cs(V1-xTax)3Sb5 with enhanced superconductivity

doi:10.1088/1674-1056/ad4ffa

中国物理B ›› 2024, Vol. 33 ›› Issue (7): 77406-077406.doi: 10.1088/1674-1056/ad4ffa

所属专题： SPECIAL TOPIC — Recent progress on kagome metals and superconductors

Two-fold symmetry of the in-plane resistance in kagome superconductor Cs(V_1-xTa_x)₃Sb₅ with enhanced superconductivity

Zhen Zhao(赵振)^1,2,†, Ruwen Wang(王汝文)^1,2,†, Yuhang Zhang(张宇航)^1,2, Ke Zhu(祝轲)^1,2, Weiqi Yu(余维琪)¹, Yechao Han(韩烨超)², Jiali Liu(刘家利)^1,2, Guojing Hu(胡国静)¹, Hui Guo(郭辉)^1,2, Xiao Lin(林晓)², Xiaoli Dong(董晓莉)^1,2, Hui Chen(陈辉)^1,2, Haitao Yang(杨海涛)^1,2,3,‡, and Hong-Jun Gao(高鸿钧)^1,2,3

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

收稿日期:2024-04-22 修回日期:2024-05-17 接受日期:2024-05-24 出版日期:2024-06-18 发布日期:2024-06-28
通讯作者: Haitao Yang E-mail:htyang@iphy.ac.cn
基金资助:
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).

Two-fold symmetry of the in-plane resistance in kagome superconductor Cs(V_1-xTa_x)₃Sb₅ with enhanced superconductivity

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

Received:2024-04-22 Revised:2024-05-17 Accepted:2024-05-24 Online:2024-06-18 Published:2024-06-28
Contact: Haitao Yang E-mail:htyang@iphy.ac.cn
Supported by:
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).

摘要/Abstract

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_{\rm c} \sim 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.

关键词: kagome superconductor, charge density wave, rotation symmetry breaking

Abstract: 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_{\rm c} \sim 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.

Key words: kagome superconductor, charge density wave, rotation symmetry breaking

中图分类号: (Properties of superconductors)

74.25.-q

71.45.Lr (Charge-density-wave systems) 11.30.Qc (Spontaneous and radiative symmetry breaking)

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(V_1-xTa_x)₃Sb₅ with enhanced superconductivity[J]. 中国物理B, 2024, 33(7): 77406-077406.

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Two-fold symmetry of the in-plane resistance in kagome superconductor Cs(V_1-xTa_x)₃Sb₅ with enhanced superconductivity

Two-fold symmetry of the in-plane resistance in kagome superconductor Cs(V_1-xTa_x)₃Sb₅ with enhanced superconductivity

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