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

Abstract

The temperature dependence of the London penetration depth $\Delta \lambda (T)$ in the superconducting doped topological crystalline insulator Sn${}_{1-x}$In${}_x$Te was measured down to 450 mK for two different doping levels, x $\approx$ 0.45 (optimally doped) and x $\approx$ 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 $T_c$, indicating that ferroelectric interactions do not compete with superconductivity.

arXiv comment6 pages, 7 figures

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Cited by in corpus (7)

• Observation of coexisting weak localization and superconducting fluctuations in strained Sn1-xInxTe thin films
• Electron and hole contributions to normal-state transport in the superconducting system Sn${}_{1-x}$In${}_x$Te
• Unusual phonon density of states and response to the superconducting transition in the In-doped topological crystalline insulator Pb${}_{0.5}$Sn${}_{0.5}$Te
• Nodeless superconducting gap in the candidate topological superconductor Sn${}_{1-x}$In${}_x$Te for x = 0.7
• Full superconducting gap in the candidate topological superconductor In${}_{1-x}$Pb${}_x$Te for x = 0.2
• Unconventional superconductivity from electronic dipole fluctuations
• Non-Trivial Topological Phase in the Sn_{1-x}In_xTe Superconductor