Abstract

ThIrSi is a noncentrosymmetric superconductor, where the presence of the heavy element Th results in a strong antisymmetric spin-orbit coupling (ASOC). A strong ASOC causes the splitting of the Fermi surface and may lead to unconventional triplet superconductivity or to multiband superconductivity. By combining $\ensuremath{\mu}$SR, NMR, and magnetometry measurements, the authors show here that, despite the strong ASOC, ThIrSi exhibits only nodeless superconductivity, most likely of multiband nature.

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