Two-band superconductivity of Sn 1– x  In  x  Te crystals with  T   c   = 3.6–3.8 K

Yu. I. Gorina; M. V. Golubkov; T. I. Osina; V. V. Rodin; N. N. Sentyurina; S. G. Chernook; V. A. Stepanov

doi:10.1134/S1063783417100171

Two-band superconductivity of Sn_1–xIn_xTe crystals with T_c = 3.6–3.8 K

Authors: Gorina Y.I.¹, Golubkov M.V.¹, Osina T.I.¹, Rodin V.V.¹, Sentyurina N.N.¹, Chernook S.G.¹^,2, Stepanov V.A.¹
Affiliations:
1. Lebedev Physical Institute
2. Fiber Optics Research Center
Issue: Vol 59, No 10 (2017)
Pages: 1918-1925
Section: Superconductivity
URL: https://ogarev-online.ru/1063-7834/article/view/201141
DOI: https://doi.org/10.1134/S1063783417100171
ID: 201141

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Abstract

The Andreev reflection spectra of high-quality superconducting Sn_1–xIn_xTe crystals with critical temperature T_c = 3.6–3.8 K were examined. The two-band nature of the superconducting state of this compound was established. The energy gaps have s-symmetry and were measured to be 2Δ₁/kT_c = 3.5 ± 0.9 and 2Δ₂/kT_c = 7 ± 1. Neither of the contacts with a resistance of 1.5–23 Ω revealed a peak at zero voltage typical of the topological superconducting state.