Unusual nature of fully-gapped superconductivity in In-doped SnTe

Abstract

The superconductor Sn_{1-x}In_{x}Te is a doped topological crystalline insulator and has become important as a candidate topological superconductor, but its superconducting phase diagram is poorly understood. By measuring about 50 samples of high-quality, vapor-grown single crystals, we found that the dependence of the superconducting transition temperature Tc on the In content x presents a qualitative change across the critical doping xc ~ 3.8%, at which a structural phase transition takes place. Intriguingly, in the ferroelectric rhombohedral phase below the critical doping, Tc is found to be strongly ENHANCED with impurity scattering. It appears that the nature of electron pairing changes across xc in Sn_{1-x}In_{x}Te.

5 pages, 4 figures; final version published in PRB, Rapid Communications

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• Classification of topological insulators and superconductors in three spatial dimensions
• Topological Crystalline Insulators
• Bulk superconducting phase with a full energy gap in the doped topological insulator Cu_xBi_2Se_3
• Local Measurements of the Superconducting Pairing Symmetry in CuxBi2Se3
• Odd-Parity Pairing and Topological Superconductivity in a Strongly Spin-Orbit Coupled Semiconductor
• Electrochemical synthesis and superconducting phase diagram of Cu_xBi2Se3
• Enhanced superconducting pairing interaction in indium-doped tin telluride
• Surface spectral function in the superconducting state of a topological insulator
• Anomalous suppression of the superfluid density in the CuxBi2Se3 superconductor upon progressive Cu intercalation

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