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Evidence chain for time-reversal symmetry-breaking kagome superconductivity

Authors :
Deng, Hanbin
Liu, Guowei
Guguchia, Z.
Yang, Tianyu
Liu, Jinjin
Wang, Zhiwei
Xie, Yaofeng
Shao, Sen
Ma, Haiyang
Liège, William
Bourdarot, Frédéric
Yan, Xiao-Yu
Qin, Hailang
Mielke III, C.
Khasanov, R.
Luetkens, H.
Wu, Xianxin
Chang, Guoqing
Liu, Jianpeng
Christensen, Morten Holm
Kreisel, Andreas
Andersen, Brian Møller
Huang, Wen
Zhao, Yue
Bourges, Philippe
Yao, Yugui
Dai, Pengcheng
Yin, Jia-Xin
Publication Year :
2024

Abstract

Superconductivity and magnetism are antagonistic quantum matter, while their intertwining has long been considered in frustrated-lattice systems1-3. In this work, we utilize scanning tunneling microscopy and muon spin resonance to discover time-reversal symmetry-breaking superconductivity in kagome metal Cs(V,Ta)3Sb5, where the Cooper pairing exhibits magnetism and is modulated by it. In the magnetic channel, we observe spontaneous internal magnetism in a full-gap superconducting state. Under perturbations of inverse magnetic fields, we detect a time-reversal asymmetrical interference of Bogoliubov quasi-particles at a circular vector. At this vector, the pairing gap spontaneously modulates, which is distinct from pair density waves occurring at a point vector and consistent with the theoretical proposal of unusual interference effect under time-reversal symmetry-breaking. The correlation between internal magnetism, Bogoliubov quasi-particles, and pairing modulation provides a chain of experimental clues for time-reversal symmetry-breaking kagome superconductivity.<br />Comment: To appear in Nature Materials (2024)

Details

Database :
arXiv
Publication Type :
Report
Accession number :
edsarx.2408.02898
Document Type :
Working Paper