Evidence chain for time-reversal symmetry-breaking kagome superconductivity
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.
Keywords
Cite
@article{arxiv.2408.02898,
title = {Evidence chain for time-reversal symmetry-breaking kagome superconductivity},
author = {Hanbin Deng and Guowei Liu and Z. Guguchia and Tianyu Yang and Jinjin Liu and Zhiwei Wang and Yaofeng Xie and Sen Shao and Haiyang Ma and William Liège and Frédéric Bourdarot and Xiao-Yu Yan and Hailang Qin and C. Mielke and R. Khasanov and H. Luetkens and Xianxin Wu and Guoqing Chang and Jianpeng Liu and Morten Holm Christensen and Andreas Kreisel and Brian Møller Andersen and Wen Huang and Yue Zhao and Philippe Bourges and Yugui Yao and Pengcheng Dai and Jia-Xin Yin},
journal= {arXiv preprint arXiv:2408.02898},
year = {2025}
}
Comments
To appear in Nature Materials (2024)