Superconductivity, pairing symmetry, and disorder in the doped topological insulator Sn$_{1-x}$ In$_x$ Te for x $\geq$ 0.10

The temperature dependence of the London penetration depth Δλ(T) in the superconducting doped topological crystalline insulator Sn1−xInxTe was measured down to 450 mK for two different doping levels, x≈0.45 (optimally doped) and x≈0.10 (underdoped), bookending the range of cubic phase in the compoun...

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Bibliographic Details
Published in:Physical review. B 2018, Vol.97 (2)
Main Authors: Smylie, M.P., Claus, H., Kwok, W.K., Louden, E.R., Eskildsen, M.R., Sefat, A.S., Zhong, R.D., Schneeloch, J., Gu, G.D., Bokari, E., Niraula, P.M., Kayani, A., Dewhurst, C.D., Snezhko, A., Welp, U.
Format: Article
Language:English
Subjects:
General Physics
Physics
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Summary:The temperature dependence of the London penetration depth Δλ(T) in the superconducting doped topological crystalline insulator Sn1−xInxTe was measured down to 450 mK for two different doping levels, x≈0.45 (optimally doped) and x≈0.10 (underdoped), bookending the range of cubic phase in the compound. The results indicate no deviation from fully gapped BCS-like behavior, eliminating several candidate unconventional gap structures. Critical field values below 1 K and other superconducting parameters are also presented. The introduction of disorder by repeated particle irradiation with 5 MeV protons does not enhance Tc, indicating that ferroelectric interactions do not compete with superconductivity.
ISSN:2469-9950
2469-9969
DOI:10.1103/PhysRevB.97.024511