Electron and hole contributions to normal-state transport in the superconducting system Sn${}_{1-x}$In${}_x$Te

Abstract

Indium-doped SnTe has been of interest because the system can exhibit both topological surface states and bulk superconductivity. While the enhancement of the superconducting transition temperature is established, the character of the electronic states induced by indium doping remains poorly understood. We report a study of magneto-transport in a series of Sn${}_{1-x}$In${}_x$Te single crystals with $0.1\le x\le 0.45$. From measurements of the Hall effect, we find that the dominant carrier type changes from hole-like to electron-like at $x\sim 0.25$; one would expect electron-like carriers if the In ions have a valence of $+3$. For single crystals with $x=0.45$, corresponding to the highest superconducting transition temperature, pronounced Shubnikov-de Haas oscillations are observed in the normal state. In measurements of magnetoresistance, we find evidence for weak anti-localization (WAL). We attribute both the quantum oscillations and the WAL to bulk Dirac-like hole pockets, previously observed in photoemission studies, which coexist with the dominant electron-like carriers.

arXiv comment8 pages, 7 figures; accepted version

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Cited by in corpus (5)

• Magnetoterahertz Response and Faraday Rotation from Massive Dirac Fermions in the Topological Crystalline Insulator Pb${}_{0.5}$Sn${}_{0.5}$Te
• Observation of coexisting weak localization and superconducting fluctuations in strained Sn1-xInxTe thin films
• Electron-phonon coupling and superconductivity in the doped topological-crystalline insulator (Pb${}_{0.5}$Sn${}_{0.5}$)${}_{1-x}$In${}_x$Te
• Nodeless superconducting gap in the candidate topological superconductor Sn${}_{1-x}$In${}_x$Te for x = 0.7
• Non-Trivial Topological Phase in the Sn_{1-x}In_xTe Superconductor