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

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

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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.

kagome latticecharge density wavesuperconducting energy gapscanning tunneling microscopy

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

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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

Information Materials and Intelligent Sensing Laboratory of Anhui Province,Institutes of Physical Science and Information Technology,Anhui University,Hefei 230601,China

Collaborative Innovation Center of Advanced Microstructures,Nanjing 210093,China

National Key R&D Program of ChinaNational Key R&D Program of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaInnovation Program for Quantum science and TechnologyBasic Research Program of the Chinese Academy of Sciences Based on Major Scientific InfrastructuresStrategic Priority Research Program of Chinese Academy of SciencesAnhui Initiative in Quantum Information TechnologiesFundamental Research Funds for the Central UniversitiesFundamental Research Funds for the Central UniversitiesMajor Basic Program of the Natural Science Foundation of Shandong Province

2022YFA16026002018YFA0305602118881011207436452273309522611356382021ZD0302802JZHKYPT-2021-08XDB25000000AHY160000WK3510000012WK3510000015ZR2021ZD01

2024

10.1007/s11433-023-2360-y

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
年,卷(期)：2024.67(7)