Pressure-induced superconductivity in Bi2−xSbxTe3−ySey
Tong He, Xiaofan Yang, Tomoya Taguchi, Teppei Ueno, Kaya Kobayashi, Jun Akimitsu, Hitoshi Yamaoka, Hirofumi Ishii, Yen-Fa Liao, Hiromi Ota, Hidenori Goto, Ritsuko Eguchi, Kensei Terashima, Takayoshi Yokoya, Harald O. Jeschke, Xianxin Wu, Yoshihiro Kubozono
DOI 10.1103/PhysRevB.100.094525 · Physical Review B
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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, R3¯m, 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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Bi2-xSbxTe3-ySey Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 5.45 | 13.5 GPa | onset |
| Bi2-xSbxTe3-ySey Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure unresolved | unknown |
| CuxBi2Se3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 3.8 | Pressure not reported | unknown |
| SrxBi2Se3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.2 | Pressure not reported | unknown |
| Sr0.065Bi2Se3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 8.3 | 6 GPa | unknown |
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