TY - JOUR
T1 - Evidence for time-reversal symmetry-breaking kagome superconductivity
AU - Deng, Hanbin
AU - Liu, Guowei
AU - Guguchia, Z.
AU - Yang, Tianyu
AU - Liu, Jinjin
AU - Wang, Zhiwei
AU - Xie, Yaofeng
AU - Shao, Sen
AU - Ma, Haiyang
AU - Liège, William
AU - Bourdarot, Frédéric
AU - Yan, Xiao Yu
AU - Qin, Hailang
AU - Mielke, C.
AU - Khasanov, R.
AU - Luetkens, H.
AU - Wu, Xianxin
AU - Chang, Guoqing
AU - Liu, Jianpeng
AU - Christensen, Morten Holm
AU - Kreisel, Andreas
AU - Andersen, Brian Møller
AU - Huang, Wen
AU - Zhao, Yue
AU - Bourges, Philippe
AU - Yao, Yugui
AU - Dai, Pengcheng
AU - Yin, Jia Xin
N1 - Publisher Copyright:
© The Author(s), under exclusive licence to Springer Nature Limited 2024.
PY - 2024/12
Y1 - 2024/12
N2 - Superconductivity and magnetism are often antagonistic in quantum matter, although their intertwining has long been considered in frustrated-lattice systems. Here we utilize scanning tunnelling microscopy and muon spin resonance to demonstrate 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 fully gapped superconducting state. Under the perturbation 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 an unusual interference effect under time-reversal symmetry breaking. The correlation between internal magnetism, Bogoliubov quasi-particles and pairing modulation provides a chain of experimental indications for time-reversal symmetry-breaking kagome superconductivity.
AB - Superconductivity and magnetism are often antagonistic in quantum matter, although their intertwining has long been considered in frustrated-lattice systems. Here we utilize scanning tunnelling microscopy and muon spin resonance to demonstrate 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 fully gapped superconducting state. Under the perturbation 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 an unusual interference effect under time-reversal symmetry breaking. The correlation between internal magnetism, Bogoliubov quasi-particles and pairing modulation provides a chain of experimental indications for time-reversal symmetry-breaking kagome superconductivity.
UR - https://www.scopus.com/pages/publications/85202590966
U2 - 10.1038/s41563-024-01995-w
DO - 10.1038/s41563-024-01995-w
M3 - Letter
C2 - 39198714
AN - SCOPUS:85202590966
SN - 1476-1122
VL - 23
SP - 1639
EP - 1644
JO - Nature Materials
JF - Nature Materials
IS - 12
ER -