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Spin-singlet superconductivity in doped topological crystalline insulator Sn {0.96}In {0.04}Te by Maeda, S.; Hirose, R.; Matano, K.; Novak, M.; Ando, Y.; Zheng, G. -q. is a scholarly article available to read on EtoBox.

What is Spin-singlet superconductivity in doped topological crystalline insulator Sn {0.96}In {0.04}Te about?

The In-doped topological crystalline insulator Sn_{1-x}In_xTe is a candidate for a topological superconductor, where pseudo-spin-triplet state has been proposed. To clarify the spin symmetry of Sn_{1-x}In_xTe, we perform ^{125}Te-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 (T_c) in polycrystalline Sn_{0.96}In_{0.04}Te, which indicates a fully-opened superconducting gap. In this sample, the spin susceptibility measured by the spin Knight shift (K_s) at an external magnetic field of H_0 = 0.0872 T decreases below T_c, and K_s(T=0)/K_s(T=T_c) reaches to 0.36 \pm 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 Sn_{0.96}In_{0.04}Te is a spin-singlet superconductor.

Author

Maeda, S.; Hirose, R.; Matano, K.; Novak, M.; Ando, Y.; Zheng, G. -q.

Published

2017

Language

EN