Kerr Effect studies of CsV₃Sb₅ and ScV₆Sn₆

We report novel results on the details of charge-density order in kagome superconductor CsV₃Sb₅. High-resolution polar Kerr rotation was measured using Sagnac interferometer to test for highly discussed loop current state, which is predicted to onset simultaneously with charge-density wave (CDW) phase. This work is continuation of the study reported in PhysRevLett.131.016901. To further extend our study, we report measurement preformed at a diferent wavelength of 830 nm in addition to previously reported results probed with 1550 nm wavelength. Probe at a different energy scale sheds new light at the state of CDW in CsV₃Sb₅.

Work was supported by the U.S. Department of Energy, Office of Science, Basic Energy Sciences, Division of Materials Sciences and Engineering, under Contract DE-AC02-76SF00515.