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Simultaneous low-temperature electrical resistivity and Hall effectmeasurements were performed on single-crystalline Bi2Se3 under appliedpressures up to 50 GPa. As a function of pressure, superconductivity isobserved to onset above 11 GPa with a transition temperature Tc and uppercritical field Hc2 that both increase with pressure up to 30 GPa, where theyreach maximum values of 7 K and 4 T, respectively. Upon further pressureincrease, Tc 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 Tc remains constant.Together with a quasi-linear temperature dependence of Hc2 that exceeds theorbital and Pauli limits, the anomalously stagnant pressure dependence of Tcpoints to an unconventional pressure-induced pairing state in Bi2Se3 that isunique among the superconducting topological insulators.

Pressure-Induced Unconventional Superconducting Phase in the Topological Insulator Bi2Se3