Pressure-Induced Superconductivity in Mineral Calaverite AuTe
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概要
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The pressure dependences of resistivity and ac susceptibility have been measured in the mineral calaverite AuTe<inf>2</inf>. 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 AuTe<inf>2</inf>, the highest superconducting transition temperature under pressure is T_{\text{c}} = 2.3 K at 2.34 GPa; it was T_{\text{c}} = 4.0 K for Pt-doped (Au<inf>0.65</inf>Pt<inf>0.35</inf>)Te<inf>2</inf>. The difference in T_{\text{c}} between the two systems is discussed on the basis of the results obtained using the band calculations and McMillan's formula.
- The Physical Society of Japanの論文
- 2013-11-15
著者
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KOTEGAWA Hisashi
Department of Materials Engineering Science, Graduate School of Engineering Science, Osaka Universit
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Tou Hideki
Department Of Material Physics Faculty Of Engineering Science Osaka University
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Kudo Kazutaka
Department Of Applied Physics Graduate School Of Engineering Tohoku University
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Harima Hisatomo
Department Of Condensed Matter Physics The Institute Of Scientific And Industrial Research Osaka Uni
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ISHII Hiroyuki
Department of Chemical and Biochemical Engineering, Toyama University
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Nohara Minoru
Department Of Advanced Materials Science University Of Tokyo
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Kitagawa Shunsaku
Department of Physics, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan
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Harima Hisatomo
Department of Physics, Kobe University, Kobe 658-8530, Japan
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Kitagawa Shunsaku
Department of Physics, Kobe University, Kobe 658-8530, Japan
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Ishii Hiroyuki
Department of Physics, Okayama University, Okayama 700-8530, Japan
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