18th APS-SCCM; 24th AIRAPT | |
Pressure-induced superconductivity in non-stoichiometric bismuth telluride Bi35Te65 | |
Yamada, Y.^3 ; Einaga, M.^1 ; Ohmura, A.^2 ; Ishikawa, F.^3 ; Nakayama, A.^2 ; Yamada, Yuh^3 ; Nakano, S.^4 ; Matsushita, A.^4 ; Shimizu, K.^1 | |
KYOKUGEN, Center for Quantum Science and Technology under Extreme Conditions, Osaka University, Osaka | |
562-8531, Japan^1 | |
Center for Transdisciplinary Research, Niigata University, Niigata | |
950-2181, Japan^2 | |
Department of Physics, Niigata University, Niigata | |
950-2181, Japan^3 | |
National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba | |
305-0044, Japan^4 | |
关键词: Electrical resistivity measurements; High-pressure phasis; P type semiconductor; Pressure induced superconductivity; Rhombohedral structures; Structural phase transition; Superconducting transitions; X-ray diffraction studies; | |
Others : https://iopscience.iop.org/article/10.1088/1742-6596/500/19/192003/pdf DOI : 10.1088/1742-6596/500/19/192003 |
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来源: IOP | |
【 摘 要 】
We performed x-ray diffraction study and electrical resistivity measurement of non-stoichiometric n-type Bi35Te65under high pressure to investigate pressure-induced superconductivity and structural phase transition. Stoichiometric bismuth telluride (Bi2Te3), which is a p-type semiconductor, has the rhombohedral structure with space group R-3m at ambient condition. Pressure-induced superconductivity of stoichiometric p-type Bi2Te3occurs in the high-pressure phases which appear above 8 GPa. Bi35Te65has also the R-3m structure at ambient condition with electron carriers. X-ray diffraction study shows that the R-3m structure remains stable up to 8 GPa at room temperature. The superconducting transition in n-type Bi35Te65is observed above 6 GPa; the transition temperature is 2.9 K at 6 GPa. The electrical resistivity at room temperature decreases rapidly at pressures from 7 to 8 GPa, indicating the occurrence of structural phase transition. It suggests that the superconducting transition at 6 GPa occurs at the ambient pressure phase with the R-3m structure.
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