Pressure-induced superconductivity in mineral calaverite AuTe2

Shunsaku Kitagawa, Hisashi Kotegawa, Hideki Tou, Hiroyuki Ishii, Kazutaka Kudo, Minoru Nohara, Hisatomo Harima

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

The pressure dependences of resistivity and ac susceptibility have been measured in the mineral calaverite AuTe2. Resistivity clearly shows a first-order phase transition into a high-pressure phase, consistent with the results of a previous structural analysis. We found zero resistivity and a diamagnetic shielding signal at low temperatures in the high-pressure phase, which clearly indicates the appearance of superconductivity. Our experimental results suggest that bulk superconductivity appears only in the high-pressure phase. For AuTe2, the highest superconducting transition temperature under pressure is Tc= 2.3 K at 2.34 GPa; it was Tc= 4.0 K for Pt-doped (Au0:65Pt0:35)Te2. The difference in Tcbetween the two systems is discussed on the basis of the results obtained using the band calculations and McMillan's formula.

Original languageEnglish
Article number113704
Journaljournal of the physical society of japan
Volume82
Issue number11
DOIs
Publication statusPublished - Nov 1 2013

Keywords

  • AuTe
  • Pressure
  • Structural phase transition
  • Superconductivity

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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