Fig. 2: ZF-μSR spectra bring evidence of TRS breaking.
From: Re1−xMox as an ideal test case of time-reversal symmetry breaking in unconventional superconductors
a, b ZF-μSR time spectra collected above and below Tc for Re1−xMox alloys with x = 0 (a) and x = 0.12 (b). The ZF-μSR spectra of the other samples are shown in Supplementary Fig. 1. c, d Zero-field muon-spin relaxation rate versus temperature of Re1−xMox with x = 0 (c) and x = 0.12 (d). A consistent increase of σZF below Tc reflects the onset of spontaneous magnetic fields, indicative of a breaking of TRS in the superconducting state. The flat μSR datasets in a and b correspond to LF-μSR spectra, which suggest a prompt decoupling of the muon spins already at small LF. The solid lines through the data in a and b are fits to Eq. (1), while the solid lines in c and d are guides to the eyes. For x = 0, further ZF-μSR data were collected at the LTF spectrometer and shown to be highly consistent with the GPS datasets adopted from Shang et al.14, where the data analysis is reported in great detail. The error bars of σZF are the SDs obtained from fits to Eq. (1) by the musrfit software package52.
