Ultralow-Temperature Heat Transport Evidence for Residual Density of States in the Superconducting State of CsV3Sb5

赵成成 ¹王临舒 ²夏威 ³殷蔷薇 ⁴邓翰宾 ⁵刘国威 ⁵刘锦锦 ⁶张旭 ²倪佳敏 ²黄烨煜 ²涂成鹏 ²陶咨成 ⁷涂志俊 ⁴龚春生 ⁴王秩伟 ⁶雷和畅 ⁴郭艳峰 ⁷杨小帆 ²殷嘉鑫 ⁵李世燕⁸

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作者信息

1. State Key Laboratory of Surface Physics,Department of Physics,Fudan University,Shanghai 200438,China;Shanghai Research Center for Quantum Sciences,Shanghai 201315,China
2. State Key Laboratory of Surface Physics,Department of Physics,Fudan University,Shanghai 200438,China
3. School of Physical Science and Technology,ShanghaiTech University,Shanghai 201210,China;ShanghaiTech Laboratory for Topological Physics,Shanghai 201210,China
4. Department of Physics and Beijing Key Laboratory of Opto-electronic Functional Materials and Micro-nano Devices,Renmin University of China,Beijing 100872,China
5. Department of Physics,Southern University of Science and Technology,Shenzhen 518055,China
6. Center for Quantum Physics,Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement(MOE),School of Physics,Beijing Institute of Technology,Beijing 100081,China
7. School of Physical Science and Technology,ShanghaiTech University,Shanghai 201210,China
8. State Key Laboratory of Surface Physics,Department of Physics,Fudan University,Shanghai 200438,China;Shanghai Research Center for Quantum Sciences,Shanghai 201315,China;Shanghai Branch,Hefei National Laboratory,Shanghai 201315,China;Collaborative Innovation Center of Advanced Microstructures,Nanjing 210093,China
折叠

Abstract

V-based kagome superconductors AV3Sb5(A=K,Rb,and Cs)host a charge density wave(CDW)and a topological nontrivial band structure,thereby providing a great platform to study the interplay of supercon-ductivity(SC),CDW,frustration,and topology.Here,we report ultralow-temperature thermal conductivity measurements of CsV3Sb5 and Ta-doped Cs(V0.86Ta0.14)3Sb5 and scanning tunneling microscopy(STM)mea-surements of CsV3Sb5.The finite residual linear term of thermal conductivity at zero magnetic field suggests the existence of a residual density of states(DOS)in the superconducting state of CsV3Sb5.This is supported by the observation of non-zero conductance at zero bias in STM spectrum at an electronic temperature of 90 mK.However,in Cs(V0.86Ta0.14)3Sb5,which does not have CDW order,there is no evidence for the residual DOS.These results show the importance of CDW order for the residual DOS,and that a nodal s-wave gap or residual Fermi arc may be the origin of the residual DOS in such an unusual multiband kagome superconductor,CsV3Sb5.

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出版年

2024

中国物理快报(英文版)

中国科学院物理研究所,中国物理学会

中国物理快报(英文版)

CSTPCDEI

影响因子：0.515

ISSN：0256-307X

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