Quasi-localized Impurity State in Doped Topological Crystalline Insulator Sn${}_{0.9}$In${}_{0.1}$Te Probed by ${}^{125}$Te-NMR

Abstract

The In-doped topological crystalline insulator Sn${}_{1-x}$In${}_x$Te is a promising candidate for a topological superconductor, where it is theoretically suggested that In creates an impurity state responsible for superconductivity. We synthesized high purity Sn${}_{1-x}$In${}_x$Te samples and performed ${}^{125}$Te-nuclear magnetic resonance (NMR) measurements. The NMR spectra under a magnetic field of $H_0$ = 5 T show a broadening characteristic due to a localized impurity state. The spin-lattice relaxation rate ($1/T_1$) divided by temperature shows a Curie-Weiss like temperature-dependence under $H_0$ = 0.1 T but is temperature-independent under $H_0$ = 5 T. These results indicate the existence of quasi-localized impurity states due to In doping.

arXiv commentJ. Phys. Soc. Jpn. (in press)

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Cited by in corpus (4)

• Indium substitution effect on the topological crystalline insulator family (Pb${}_{1-x}$Sn${}_x$)${}_{1-y}$In${}_y$Te: Topological and superconducting properties
• Observation of coexisting weak localization and superconducting fluctuations in strained Sn1-xInxTe thin films
• Spin-singlet superconductivity in doped topological crystalline insulator Sn_{0.96}In_{0.04}Te
• Anomalous ^{125}Te Nuclear Spin Relaxation Coincident with Charge Kondo Behavior in Superconducting Pb_{1-x}Tl_{x}Te