Nodeless superconductivity in the noncentrosymmetric compound ThIrSi

作者：Tay, D.; Shang, T.^*; Rosa, Priscila F. S.; Santos, F. B.; Thompson, J. D.; Fisk, Z.; Ott, H. -r.; Shiroka, T.^*

来源：Physical Review B, 2023, 107(6): 064507.

DOI：10.1103/PhysRevB.107.064507

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The superconductor ThIrSi, with Tc = 6.5 K, is expected to show unusual features in view of its noncen-trosymmetric structure and the presence of heavy elements featuring a sizable spin-orbit coupling. Here, we report a comprehensive study of its electronic properties by means of magnetization, muon-spin rotation and relaxation (mu SR) and nuclear magnetic resonance (NMR) measurements. Both the superfluid density psc(T) (determined via transverse-field mu SR) and the spin-lattice relaxation rate T1-1(T) (determined via NMR) suggest a nodeless superconductivity. Furthermore, the absence of spontaneous magnetic fields below Tc, as evinced from zero-field mu SR measurements, indicates a preserved time-reversal symmetry in the superconducting state of ThIrSi. Temperature-dependent upper critical fields as well as field-dependent superconducting muon-spin relaxations suggest the presence of multiple superconducting gaps in ThIrSi.