Superconductivity in Dense Rashba Semiconductor BiTeCl

Abstract

Layered non-centrosymmetric bismuth tellurohalides are being examined as candidates for topological insulators. Pressure is believed to be essential for inducing and tuning topological order in these systems. Through electrical transport and Raman scattering measurements, we find superconductivity in two high-pressure phases of BiTeCl with the different normal state features, carrier characteristics, and upper critical field behaviors. Superconductivity emerges when the resistivity maximum or charge density wave is suppressed by the applied pressure and then persists till the highest pressure of 51 GPa measured. The huge enhancement of the resistivity with three magnitude of orders indicates the possible achievement of the topological order in the dense insulating phase. These findings not only enrich the superconducting family from topological insulators but also pave the road on the search of topological superconductivity in bismuth tellurohalides.

5 pages, 4 figures

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• Pressure-driven Superconductivity in Transition-metal Pentatelluride HfTe5
• Exploring Topological Superconductivity in Topological Materials
• Pressure-induced superconductivity in the giant Rashba system BiTeI
• BiTeCl and BiTeBr: a comparative high-pressure optical study
• Pressure-Induced Large Volume Collapse, Plane-to-Chain, Insulator to Metal Transition in CaMn${}_2$Bi${}_2$
• Pressure-induced superconductivity in palladium sulfide
• Evolution of the Fermi surface of BiTeCl with pressure