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Crystals 2017, 7(2), 55; doi:10.3390/cryst7020055

Indium Substitution Effect on the Topological Crystalline Insulator Family (Pb1−xSnx)1−yInyTe: Topological and Superconducting Properties

1
Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, NY 11973, USA
2
Materials Science and Engineering Department, Stony Brook University, Stony Brook, NY 11794, USA
3
Physics Department, Stony Brook University, Stony Brook, NY 11794, USA
4
Department of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China
5
Tsung-Dao Lee Institute, Shanghai 200240, China
*
Author to whom correspondence should be addressed.
Academic Editor: Satoshi Sasaki
Received: 1 December 2016 / Revised: 30 January 2017 / Accepted: 11 February 2017 / Published: 16 February 2017
(This article belongs to the Special Issue Topological Crystalline Insulators: Current Progress and Prospects)
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Abstract

Topological crystalline insulators (TCIs) have been of great interest in the area of condensed matter physics. We investigated the effect of indium substitution on the crystal structure and transport properties in the TCI system (Pb1−xSnx)1−yInyTe. For samples with a tin concentration x 50 % , the low-temperature resisitivities show a dramatic variation as a function of indium concentration: with up to ∼2% indium doping, the samples show weak-metallic behavior similar to their parent compounds; with ∼6% indium doping, samples have true bulk-insulating resistivity and present evidence for nontrivial topological surface states; with higher indium doping levels, superconductivity was observed, with a transition temperature, T c , positively correlated to the indium concentration and reaching as high as 4.7 K. We address this issue from the view of bulk electronic structure modified by the indium-induced impurity level that pins the Fermi level. The current work summarizes the indium substitution effect on (Pb,Sn)Te, and discusses the topological and superconducting aspects, which can be provide guidance for future studies on this and related systems. View Full-Text
Keywords: topological crystalline insulator; crystal growth; superconductivity topological crystalline insulator; crystal growth; superconductivity
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Zhong, R.; Schneeloch, J.; Li, Q.; Ku, W.; Tranquada, J.; Gu, G. Indium Substitution Effect on the Topological Crystalline Insulator Family (Pb1−xSnx)1−yInyTe: Topological and Superconducting Properties. Crystals 2017, 7, 55.

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