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 language | English |
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Article number | 113704 |
Journal | journal of the physical society of japan |
Volume | 82 |
Issue number | 11 |
DOIs | |
Publication status | Published - Nov 2013 |
Keywords
- AuTe
- Pressure
- Structural phase transition
- Superconductivity
ASJC Scopus subject areas
- Physics and Astronomy(all)