Studies of the Non-Centrosymmetric Superconductor ThIrSi using ²⁹Si NMR

Non-centrosymmetric superconductors have stirred interest in the last number of years due to their unique characteristics. Broken inversion symmetry combined with spin-orbit coupling breaks the spin degeneracy of the Fermi surface, and allows for mixed parity superconductivity. ThIrSi possesses a non-centrosymmetric structure and demonstrates a superconducting transition temperature of 6.4K, higher than its analog compounds ThCoSi, ThNiSi, and ThPtSi. Nuclear magnetic resonance (NMR) spectroscopy is a powerful tool for condensed matter systems, primarily through measurements of the spin-lattice relaxation T₁ and the Knight shift. In superconductors, NMR is particularly useful to determine the nature of the superconducting gap as well as provide evidence for spin-triplet superconductivity. We discuss our NMR results on the superconductor ThIrSi by measuring the ²⁹Si spin-1/2 resonance.