Nodeless superconductivity in the noncentrosymmetric compound ThIrSi

Author(s)

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

• Document type: Journal article
• Source: PHYSICAL REVIEW B; v. 107, n. 6, p. 8-pg., 2023-02-14.

Abstract

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. (AU)

• FAPESP's process: 18/20546-1 - Single crystal growth of (Hf, Sc, RE)V2Ga4 (RE = rare earth) and (Fe, Co, Ru)1-xRMxGa3 (RM = refractory metals) compounds and the study of their Fermi surface, electronic structure, and superconducting properties under extreme conditions
• Grantee: Frederico Benedetto Santos
• Support Opportunities: Scholarships abroad - Research Internship - Doctorate (Direct)
• FAPESP's process: 16/11565-7 - Investigation of the superconductivity and magnetism in compounds that crystallize on the YbMo2Al4 and IrIn3 prototype
• Grantee: Frederico Benedetto Santos
• Support Opportunities: Scholarships in Brazil - Doctorate (Direct)