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Zhang, J L; Zhang, S J; Weng, H M; Zhang, W; Yang, L X; Liu, Q Q; Feng, S M; Wang, X C; Yu, R C; Cao, L Z; Wang, L; Yang, W G; Liu, H Z; Zhao, W Y; Zhang, S C; Dai, X; Fang, Z; Jin, C Q
Proceedings of the National Academy of Sciences - PNAS, 01/2011, Volume: 108, Issue: 1Journal Article
We report a successful observation of pressure-induced superconductivity in a topological compound Bi 2 Te 3 with T c of ∼3 K between 3 to 6 GPa. The combined high-pressure structure investigations with synchrotron radiation indicated that the superconductivity occurred at the ambient phase without crystal structure phase transition. The Hall effects measurements indicated the hole-type carrier in the pressure-induced superconducting Bi 2 Te 3 single crystal. Consequently, the first-principles calculations based on the structural data obtained by the Rietveld refinement of X-ray diffraction patterns at high pressure showed that the electronic structure under pressure remained topologically nontrivial. The results suggested that topological superconductivity can be realized in Bi 2 Te 3 due to the proximity effect between superconducting bulk states and Dirac-type surface states. We also discuss the possibility that the bulk state could be a topological superconductor.
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