Abstract
We systematically investigated the pressure dependence of electrical transport and the crystal structure of topological insulator, Bi2-xSbxTe3-ySey, which showed no superconductivity down to 2.0 K at ambient pressure. The Bi2-xSbxTe3-ySey crystal showed two structural phase transitions under pressure, from rhombohedral structure (space group No. 166, R3m, termed phase I) to monoclinic structure (space group No. 12, C2/m, termed phase II), and from phase II to another monoclinic structure (space group No. 12, C2/m, termed phase III). Superconductivity appeared when applying pressure; actually the superconductivity of all Bi2-xSbxTe3-ySey samples emerged in phase I. The superconducting transition temperature, Tc, increased against pressure in a pressure range of 0-15 GPa for all Bi2-xSbxTe3-ySey samples, and the maximum Tc was 5.45 K, recorded at 13.5 GPa in Bi2-xSbxTe3-ySey at x=0 and y=1.0. The magnetic field (H) dependence of the R-T plot for Bi2-xSbxTe3-ySey was measured to characterize the superconducting pairing mechanism of pressure-induced superconducting phase.
| Original language | English |
|---|---|
| Article number | 094525 |
| Journal | Physical Review B |
| Volume | 100 |
| Issue number | 9 |
| DOIs | |
| Publication status | Published - Sep 19 2019 |
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ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
Cite this
Pressure-induced superconductivity in B i2-x S bx T e3-y S ey. / He, Tong; Yang, Xiaofan; Taguchi, Tomoya; Ueno, Teppei; Kobayashi, Kaya; Akimitsu, Jun; Yamaoka, Hitoshi; Ishii, Hirofumi; Liao, Yen Fa; Ota, Hiromi; Goto, Hidenori; Eguchi, Ritsuko; Terashima, Kensei; Yokoya, Takayoshi; Jeschke, Harald Olaf; Wu, Xianxin; Kubozono, Yoshihiro.
In: Physical Review B, Vol. 100, No. 9, 094525, 19.09.2019.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Pressure-induced superconductivity in B i2-x S bx T e3-y S ey
AU - He, Tong
AU - Yang, Xiaofan
AU - Taguchi, Tomoya
AU - Ueno, Teppei
AU - Kobayashi, Kaya
AU - Akimitsu, Jun
AU - Yamaoka, Hitoshi
AU - Ishii, Hirofumi
AU - Liao, Yen Fa
AU - Ota, Hiromi
AU - Goto, Hidenori
AU - Eguchi, Ritsuko
AU - Terashima, Kensei
AU - Yokoya, Takayoshi
AU - Jeschke, Harald Olaf
AU - Wu, Xianxin
AU - Kubozono, Yoshihiro
PY - 2019/9/19
Y1 - 2019/9/19
N2 - We systematically investigated the pressure dependence of electrical transport and the crystal structure of topological insulator, Bi2-xSbxTe3-ySey, which showed no superconductivity down to 2.0 K at ambient pressure. The Bi2-xSbxTe3-ySey crystal showed two structural phase transitions under pressure, from rhombohedral structure (space group No. 166, R3m, termed phase I) to monoclinic structure (space group No. 12, C2/m, termed phase II), and from phase II to another monoclinic structure (space group No. 12, C2/m, termed phase III). Superconductivity appeared when applying pressure; actually the superconductivity of all Bi2-xSbxTe3-ySey samples emerged in phase I. The superconducting transition temperature, Tc, increased against pressure in a pressure range of 0-15 GPa for all Bi2-xSbxTe3-ySey samples, and the maximum Tc was 5.45 K, recorded at 13.5 GPa in Bi2-xSbxTe3-ySey at x=0 and y=1.0. The magnetic field (H) dependence of the R-T plot for Bi2-xSbxTe3-ySey was measured to characterize the superconducting pairing mechanism of pressure-induced superconducting phase.
AB - We systematically investigated the pressure dependence of electrical transport and the crystal structure of topological insulator, Bi2-xSbxTe3-ySey, which showed no superconductivity down to 2.0 K at ambient pressure. The Bi2-xSbxTe3-ySey crystal showed two structural phase transitions under pressure, from rhombohedral structure (space group No. 166, R3m, termed phase I) to monoclinic structure (space group No. 12, C2/m, termed phase II), and from phase II to another monoclinic structure (space group No. 12, C2/m, termed phase III). Superconductivity appeared when applying pressure; actually the superconductivity of all Bi2-xSbxTe3-ySey samples emerged in phase I. The superconducting transition temperature, Tc, increased against pressure in a pressure range of 0-15 GPa for all Bi2-xSbxTe3-ySey samples, and the maximum Tc was 5.45 K, recorded at 13.5 GPa in Bi2-xSbxTe3-ySey at x=0 and y=1.0. The magnetic field (H) dependence of the R-T plot for Bi2-xSbxTe3-ySey was measured to characterize the superconducting pairing mechanism of pressure-induced superconducting phase.
UR - http://www.scopus.com/inward/record.url?scp=85072763184&partnerID=8YFLogxK
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U2 - 10.1103/PhysRevB.100.094525
DO - 10.1103/PhysRevB.100.094525
M3 - Article
AN - SCOPUS:85072763184
VL - 100
JO - Physical Review B
JF - Physical Review B
SN - 2469-9950
IS - 9
M1 - 094525
ER -