2017/05/31 by S. Maeda, R. Hirose, Ryohei Hirose +7 · 1 citation
Chemistry · Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Atomic physics #Chemistry #Condensed matter physics #Crystallography #Excited state #Graphene research and applications #Knight shift #Materials science #Physics #Singlet state #Spin (aerodynamics) #Superconductivity #Topological Materials and Phenomena #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevb.96.104502
published as Phys. Rev. B 96, 104502 (2017) · 10 pages, 5 figures
openalex created_date 2017/06/05 · openalex publication_date 2017/09/05 · arxiv created 2017/09/14 · arxiv updated 2017/09/15 · openalex updated_date 2026/08/05
The In-doped topological crystalline insulator Sn_1\ensuremath-xInxTe is a candidate for a topological superconductor, where a pseudo-spin-triplet state has been proposed. To clarify the spin symmetry of Sn_1\ensuremath-xInxTe, we perform 125Te-nuclear magnetic resonance (NMR) measurements in polycrystalline samples with 0\ensuremath≤x\ensuremath≤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 \ensuremathμ0H0=0.0872 T decreases below Tc, and Ks(T=0)/Ks(T=Tc) reaches 0.36\ifmmode±\else\textpm\fi0.10, 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.