Resolving the discrepancy between MOKE measurements at 1550-nm wavelength on Kagome Metal CsV3Sb5

Kagome metals AV 3 Sb 5 (A = K, Cs, Rb) provide a rich platform for intertwined orders, where evidence for time-reversal symmetry breaking possibly due to the long-sought loop currents has emerged in µ SR and MOKE experiments. Intriguingly, the observed spontaneous MOKE signals differ by orders of magnitude between different wavelengths, and more oddly, within the same wavelength. Here we perform comprehensive 1550 𝑛𝑚 MOKE measurements on CsV 3 Sb 5 under respective experimental conditions in prior reports. The results are consistent with Stanford and Irvine but differ in sign and size from Kyoto under identical conditions. The opposite behaviors of MOKE susceptibility under identical magnetic fields indicate different magnetic configurations between samples, which we conclude is the only remaining plausible explanation for the discrepancy in 1550 𝑛𝑚 MOKE results.

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