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 |
|---|---|
| Article number | 113704 |
| Journal | Journal of the Physical Society of Japan |
| Volume | 82 |
| Issue number | 11 |
| DOIs | |
| Publication status | Published - Nov 2013 |
Fingerprint
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 journal › Article
}
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 -