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 2013

Fingerprint

superconductivity
minerals
electrical resistivity
structural analysis
pressure dependence
shielding
transition temperature
magnetic permeability

Keywords

  • AuTe
  • Pressure
  • Structural phase transition
  • Superconductivity

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Pressure-induced superconductivity in mineral calaverite AuTe2 . / Kitagawa, Shunsaku; Kotegawa, Hisashi; Tou, Hideki; Ishii, Hiroyuki; Kudo, Kazutaka; Nohara, Minoru; Harima, Hisatomo.

In: Journal of the Physical Society of Japan, Vol. 82, No. 11, 113704, 11.2013.

Research output: Contribution to journalArticle

Kitagawa, Shunsaku ; Kotegawa, Hisashi ; Tou, Hideki ; Ishii, Hiroyuki ; Kudo, Kazutaka ; Nohara, Minoru ; Harima, Hisatomo. / Pressure-induced superconductivity in mineral calaverite AuTe2 In: Journal of the Physical Society of Japan. 2013 ; Vol. 82, No. 11.
@article{e3cba49416e248d59409b1d9dd2cad6a,
title = "Pressure-induced superconductivity in mineral calaverite AuTe2",
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.",
keywords = "AuTe, Pressure, Structural phase transition, Superconductivity",
author = "Shunsaku Kitagawa and Hisashi Kotegawa and Hideki Tou and Hiroyuki Ishii and Kazutaka Kudo and Minoru Nohara and Hisatomo Harima",
year = "2013",
month = "11",
doi = "10.7566/JPSJ.82.113704",
language = "English",
volume = "82",
journal = "Journal of the Physical Society of Japan",
issn = "0031-9015",
publisher = "Physical Society of Japan",
number = "11",

}

TY - JOUR

T1 - Pressure-induced superconductivity in mineral calaverite AuTe2

AU - Kitagawa, Shunsaku

AU - Kotegawa, Hisashi

AU - Tou, Hideki

AU - Ishii, Hiroyuki

AU - Kudo, Kazutaka

AU - Nohara, Minoru

AU - Harima, Hisatomo

PY - 2013/11

Y1 - 2013/11

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.

KW - AuTe

KW - Pressure

KW - Structural phase transition

KW - Superconductivity

UR - http://www.scopus.com/inward/record.url?scp=84887120419&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84887120419&partnerID=8YFLogxK

U2 - 10.7566/JPSJ.82.113704

DO - 10.7566/JPSJ.82.113704

M3 - Article

AN - SCOPUS:84887120419

VL - 82

JO - Journal of the Physical Society of Japan

JF - Journal of the Physical Society of Japan

SN - 0031-9015

IS - 11

M1 - 113704

ER -