Tailoring band structure and band filling in a simple cubic (IV, III)-VI superconductor

M. Kriener, M. Kamitani, T. Koretsune, R. Arita, Y. Taguchi, Y. Tokura

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Superconductivity and its underlying mechanisms are one of the most active research fields in condensed-matter physics. An important question is how to enhance the transition temperature Tc of a superconductor. In this respect, the possibly positive role of valence-skipping elements in the pairing mechanism has been attracting considerable interest. Here we follow this pathway and successfully enhance Tc up to almost 6 K in the simple chalcogenide SnTe known as a topological crystalline insulator by doping the valence-skipping element In substitutionally for the Sn site and codoping Se for the Te site. A high-pressure synthesis method enabled us to form single-phase solid solutions Sn1-xInxTe1-ySey over a wide composition range while keeping the cubic structure necessary for the superconductivity. Our experimental results are supported by density-functional theory calculations which suggest that even higher Tc values would be possible if the required doping range was experimentally accessible.

Original languageEnglish
Article number044802
JournalPhysical Review Materials
Volume2
Issue number4
DOIs
Publication statusPublished - 2018 Apr 25

ASJC Scopus subject areas

  • Materials Science(all)
  • Physics and Astronomy (miscellaneous)

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