Journal
PHYSICAL REVIEW LETTERS
Volume 111, Issue 8, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.111.087001
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Funding
- AFOSR-MURI [FA9550- 09-1-0603]
- U.S. Department of Energy (DOE), National Nuclear Security Administration (NNSA) [DE-AC52-07NA27344]
- NNSA under the Stewardship Science Academic Alliance program through the U.S. DOE [DE-52-09NA29459]
- DOE-NNSA [DE-FG52-10NA29660]
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Simultaneous low-temperature electrical resistivity and Hall effect measurements were performed on single-crystalline Bi2Se3 under applied pressures up to 50 GPa. As a function of pressure, superconductivity is observed to onset above 11 GPa with a transition temperature T-c and upper critical field H-c2 that both increase with pressure up to 30 GPa, where they reach maximum values of 7 K and 4 T, respectively. Upon further pressure increase, T-c remains anomalously constant up to the highest achieved pressure. Conversely, the carrier concentration increases continuously with pressure, including a tenfold increase over the pressure range where T-c remains constant. Together with a quasilinear temperature dependence of H-c2 that exceeds the orbital and Pauli limits, the anomalously stagnant pressure dependence of T-c points to an unconventional pressure-induced pairing state in Bi2Se3 that is unique among the superconducting topological insulators.
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