Pressure-induced superconductivity in mineral calaverite AuTe2

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

doi:10.7566/JPSJ.82.113704

Pressure-induced superconductivity in mineral calaverite AuTe₂

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

Research Institute for Interdisciplinary Science

Research output: Contribution to journal › Article

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 T_c= 2.3 K at 2.34 GPa; it was T_c= 4.0 K for Pt-doped (Au_0:65Pt_0:35)Te₂. The difference in T_cbetween the two systems is discussed on the basis of the results obtained using the band calculations and McMillan's formula.

Original language	English
Article number	113704
Journal	journal of the physical society of japan
Volume	82
Issue number	11
DOIs	https://doi.org/10.7566/JPSJ.82.113704
Publication status	Published - Nov 1 2013

Keywords

AuTe
Pressure
Structural phase transition
Superconductivity

ASJC Scopus subject areas

Physics and Astronomy(all)

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Kitagawa, S., Kotegawa, H., Tou, H., Ishii, H., Kudo, K., Nohara, M., & Harima, H. (2013). Pressure-induced superconductivity in mineral calaverite AuTe₂. journal of the physical society of japan, 82(11), [113704]. https://doi.org/10.7566/JPSJ.82.113704

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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.",

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AU - Kitagawa, Shunsaku

AU - Kotegawa, Hisashi

AU - Tou, Hideki

AU - Ishii, Hiroyuki

AU - Kudo, Kazutaka

AU - Nohara, Minoru

AU - Harima, Hisatomo

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N2 - 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.

AB - 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.

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KW - Structural phase transition

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