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Evidence for superconductivity with broken time-reversal symmetry in locally noncentrosymmetric SrPtAs

Evidence for superconductivity with broken time-reversal symmetry in locally noncentrosymmetric SrPtAs

We report the magnetic and superconducting properties of locally noncentrosymmetric SrPtAs obtained by muon-spin-rotation/relaxation (muSR) measurements. Zero-field muSR reveals the occurrence of small spontaneous static magnetic fields with the onset of superconductivity. This finding suggests that the superconducting state of SrPtAs breaks time-reversal symmetry. The superfluid density as determined by …