Superconductivity and non-metallicity induced by doping the topological insulators Bi2Se3 and Bi2Te3

Y. S. Hor, J. G. Checkelsky, D. Qu, N. P. Ong, R. J. Cava

Research output: Contribution to journalArticle

70 Scopus citations

Abstract

We show that by Ca doping the Bi2Se3 topological insulator, the Fermi level can be fine tuned to fall inside the band gap and therefore suppresses the bulk conductivity. Non-metallic Bi2Se 3 crystals are obtained. On the other hand, the Bi2Se 3 topological insulator can also be induced to become a bulk superconductor, with Tc∼3.8 K, by copper intercalation in the van der Waals gaps between the Bi2Se3 layers. Likewise, an as-grown crystal of metallic Bi2Te3 can be turned into a non-metallic crystal by slight variation in the Te content. The Bi 2Te3 topological insulator shows small amounts of superconductivity with Tc∼5.5 K when reacted with Pd to form materials of the type PdzBi2Te3.

Original languageEnglish (US)
Pages (from-to)572-576
Number of pages5
JournalJournal of Physics and Chemistry of Solids
Volume72
Issue number5
DOIs
StatePublished - May 1 2011

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

Keywords

  • A. Semiconductors
  • A. Superconductors
  • B. Crystal growth
  • D. Surface properties
  • D. Transport properties

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