中国科学:物理学 力学 天文学(英文版)2024，Vol.67Issue(7) ：142-150.DOI:10.1007/s11433-023-2360-y

Imaging momentum-space Cooper pair formation and its competition with the charge density wave gap in a kagome superconductor

Yiming Sun Yubing Tu Yang Luo Shuikang Yu Hongyu Li Yunmei Zhang Ping Wu Zhuying Wang Fan Zhang Wanru Ma Zuowei Liang Jianjun Ying Tao Wu Ziji Xiang Junfeng He Lei Shan Zhenyu Wang Xianhui Chen
中国科学:物理学 力学 天文学(英文版)2024，Vol.67Issue(7) ：142-150.DOI:10.1007/s11433-023-2360-y
✕
  • 维普
  • 万方数据

Imaging momentum-space Cooper pair formation and its competition with the charge density wave gap in a kagome superconductor

Yiming Sun 1Yubing Tu 2Yang Luo 1Shuikang Yu 1Hongyu Li 1Yunmei Zhang 1Ping Wu 1Zhuying Wang 1Fan Zhang 2Wanru Ma 1Zuowei Liang 1Jianjun Ying 1Tao Wu 3Ziji Xiang 1Junfeng He 1Lei Shan 2Zhenyu Wang 1Xianhui Chen3
扫码查看

作者信息

  • 1. Department of Physics,CAS Key Laboratory of Strongly Coupled Quantum Matter Physics,and Hefei National Laboratory,University of Science and Technology of China,Hefei 230026,China
  • 2. Information Materials and Intelligent Sensing Laboratory of Anhui Province,Institutes of Physical Science and Information Technology,Anhui University,Hefei 230601,China
  • 3. Department of Physics,CAS Key Laboratory of Strongly Coupled Quantum Matter Physics,and Hefei National Laboratory,University of Science and Technology of China,Hefei 230026,China;Collaborative Innovation Center of Advanced Microstructures,Nanjing 210093,China
  • 折叠

Abstract

The superconducting ground state of kagome metals AV3Sb5(where A stands for K,Rb,or Cs)emerges from an exotic charge density wave(CDW)state that potentially breaks both rotational and time reversal symmetries.However,the specifics of the Cooper pairing mechanism,and the nature of the interplay between these two states remain elusive,largely due to the lack of momentum-space(k-space)superconducting energy gap structure.By implementing Bogoliubov quasiparticle interference(BQPI)imaging,we obtain k-space information on the multiband superconducting gap structure ΔiSC(k)in pristine CsV3Sb5.We show that the estimated energy gap on the vanadium dxy/x2-y2 orbital is anisotropic but nodeless,with a minimal value located near the M point.Interestingly,a comparison of ΔiSC(k)with the CDW gap ΔiCDW(k)obtained by angle-resolved photoemission spectroscopy(ARPES)reveals direct k-space competition between these two order parameters,i.e.,the opening of a large(small)CDW gap at a given momentum corresponds to a small(large)superconducting gap.When the long-range CDW order is suppressed by replacing vanadium with titanium,we find a nearly isotropic energy gap on both the V and Sb bands.This information will be critical for identifying the microscopic pairing mechanism and its interplay with intertwined electronic orders in this kagome superconductor family.

Key words

kagome lattice/charge density wave/superconducting energy gap/scanning tunneling microscopy

引用本文复制引用

基金项目

National Key R&D Program of China(2022YFA1602600)

National Key R&D Program of China(2018YFA0305602)

National Natural Science Foundation of China(11888101)

National Natural Science Foundation of China(12074364)

National Natural Science Foundation of China(52273309)

National Natural Science Foundation of China(52261135638)

Innovation Program for Quantum science and Technology(2021ZD0302802)

Basic Research Program of the Chinese Academy of Sciences Based on Major Scientific Infrastructures(JZHKYPT-2021-08)

Strategic Priority Research Program of Chinese Academy of Sciences(XDB25000000)

Anhui Initiative in Quantum Information Technologies(AHY160000)

Fundamental Research Funds for the Central Universities(WK3510000012)

Fundamental Research Funds for the Central Universities(WK3510000015)

Major Basic Program of the Natural Science Foundation of Shandong Province(ZR2021ZD01)

出版年

2024
中国科学:物理学 力学 天文学(英文版)
中国科学院

中国科学:物理学 力学 天文学(英文版)

CSTPCD
影响因子：0.91
ISSN：1674-7348
段落导航相关论文