Evidence for topologically protected surface states and a superconducting phase in [Tl4](Tl1-xSnx)Te3 using photoemission, specific heat, and magnetization measurements, and density functional theory

K. E. Arpino*, D. C. Wallace, Y. F. Nie, T. Birol, P. D. C. King, S. Chatterjee, M. Uchida, S. M. Koohpayeh, J-J Wen, K. Page, C. J. Fennie, K. M. Shen, T. M. McQueen

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

27 Citations (Scopus)

Abstract

We report the discovery of surface states in the perovskite superconductor [Tl4]TlTe3 (Tl5Te3) and its nonsuperconducting tin-doped derivative [Tl4](Tl0.4Sn0.6)Te3 as observed by angle-resolved photoemission spectroscopy. Density functional theory calculations predict that the surface states are
protected by a Z2 topology of the bulk band structure. Specific heat and magnetization measurements show that Tl5Te3 has a superconducting volume fraction in excess of 95%. Thus Tl5Te3 is an ideal material in which to study the interplay of bulk band topology and superconductivity.

Original languageEnglish
Article number017002
Number of pages5
JournalPhysical Review Letters
Volume112
Issue number1
DOIs
Publication statusPublished - 8 Jan 2014

Keywords

  • Crystal
  • BI2SE3
  • BI2TE3

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