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 O.
AU - Wu, Xianxin
AU - Kubozono, Yoshihiro
N1 - Funding Information:
The authors appreciate Yanan Wang, Huan Li, and Lei Zhi for their kind cooperation with the transport experiments under pressure. This study was partly supported by JSPS KAKENHI Grants No. 26105004, No. 15K21732, No. 17K05500, No. 18K03540, No. 18K04940, No. 18K18736, and No. 19H02676. The XRD measurements at SPring-8 were carried out under Proposals No. 2017B1336, No. 2017B4133, No. 2018A4132, and No. 2018B4140.
Publisher Copyright:
© 2019 American Physical Society.
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.
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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 -