Quasi-localized Impurity State in Doped Topological Crystalline Insulator Sn0.9In0.1Te Probed by 125Te-NMR
Abstract
The In-doped topological crystalline insulator Sn1-xInxTe 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 Sn1-xInxTe samples and performed 125Te-nuclear magnetic resonance (NMR) measurements. The NMR spectra under a magnetic field of H0 = 5 T show a broadening characteristic due to a localized impurity state. The spin-lattice relaxation rate (1/T1) divided by temperature shows a Curie-Weiss like temperature-dependence under H0 = 0.1 T but is temperature-independent under H0 = 5 T. These results indicate the existence of quasi-localized impurity states due to In doping.
- Publication:
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Journal of the Physical Society of Japan
- Pub Date:
- February 2017
- DOI:
- 10.7566/JPSJ.86.024702
- arXiv:
- arXiv:1612.00153
- Bibcode:
- 2017JPSJ...86b4702M
- Keywords:
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- Condensed Matter - Superconductivity
- E-Print:
- J. Phys. Soc. Jpn. (in press)