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The temperature dependence of the London penetration depth $\Delta\lambda(T)$in the superconducting doped topological crystalline insulatorSn$_{1-x}$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 nodeviation from fully gapped BCS-like behavior, eliminating several candidateunconventional gap structures. Critical field values below 1 K and othersuperconducting parameters are also presented. The introduction of disorder byrepeated particle irradiation with 5 MeV protons does not enhance $T_c$,indicating that ferroelectric interactions do not compete withsuperconductivity.

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