Abstract
The temperature dependence of the London penetration depth in the superconducting doped topological crystalline insulator was measured down to 450 mK for two different doping levels, (optimally doped) and (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 , indicating that ferroelectric interactions do not compete with superconductivity.
- Received 27 November 2017
DOI:https://doi.org/10.1103/PhysRevB.97.024511
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