Spin-singlet superconductivity in the doped topological crystalline insulator Sn0.96In0.04Te

The In-doped topological crystalline insulator Sn1-xInxTe is a candidate for a topological superconductor, where a pseudo-spin-triplet state has been proposed. To clarify the spin symmetry of Sn1-xInxTe, we perform Te125-nuclear magnetic resonance (NMR) measurements in polycrystalline samples with 0≤x≤0.15. The penetration depth calculated from the NMR line width is T independent below half the superconducting transition temperature (Tc) in polycrystalline Sn0.96In0.04Te, which indicates a fully opened superconducting gap. In this sample, the spin susceptibility measured by the spin Knight shift (Ks) at an external magnetic field of μ0H0=0.0872 T decreases below Tc, and Ks(T=0)/Ks(T=Tc) reaches 0.36±0.10, which is far below the limiting value 2/3 expected for a spin-triplet state for a cubic crystal structure. Our result indicates that polycrystalline Sn0.96In0.04Te is a spin-singlet superconductor.