Pressure effect and superconductivity in the β-Bi4I4 topological insulator

Pressure effect and superconductivity in the β-Bi4I4 topological insulator We report a detailed study of the transport properties of a β-Bi4I4 quasi-one-dimensional topological insulator. Electrical resistivity, thermoelectric power, thermal conductivity, and Hall coefficient measurements are consistent with the possible appearance of a charge-density-wave order at low temperatures. Both electrons and holes contribute to the conduction in β-Bi4I4 and the dominant type of charge carrier changes with temperature as a consequence of temperature-dependent carrier densities and mobilities. Measurements of resistivity and Seebeck coefficient under hydrostatic pressure up to 2 GPa show a shift of the charge-density-wave order to higher temperatures suggesting a strongly one-dimensional character at ambient pressure. Surprisingly, superconductivity is induced in β-Bi4I4 above 10 GPa with Tc of 4.0 K which is slightly decreasing upon increasing the pressure up to 20 GPa. Chemical characterization of the pressure-treated samples shows amorphization of β-Bi4I4 under pressure and rules out decomposition into Bi and BiI3 at room-temperature conditions. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physical Review B American Physical Society (APS)

Pressure effect and superconductivity in the β-Bi4I4 topological insulator

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Pressure effect and superconductivity in the β-Bi4I4 topological insulator

Abstract

We report a detailed study of the transport properties of a β-Bi4I4 quasi-one-dimensional topological insulator. Electrical resistivity, thermoelectric power, thermal conductivity, and Hall coefficient measurements are consistent with the possible appearance of a charge-density-wave order at low temperatures. Both electrons and holes contribute to the conduction in β-Bi4I4 and the dominant type of charge carrier changes with temperature as a consequence of temperature-dependent carrier densities and mobilities. Measurements of resistivity and Seebeck coefficient under hydrostatic pressure up to 2 GPa show a shift of the charge-density-wave order to higher temperatures suggesting a strongly one-dimensional character at ambient pressure. Surprisingly, superconductivity is induced in β-Bi4I4 above 10 GPa with Tc of 4.0 K which is slightly decreasing upon increasing the pressure up to 20 GPa. Chemical characterization of the pressure-treated samples shows amorphization of β-Bi4I4 under pressure and rules out decomposition into Bi and BiI3 at room-temperature conditions.
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Publisher
The American Physical Society
Copyright
Copyright © ©2017 American Physical Society
ISSN
1098-0121
eISSN
1550-235X
D.O.I.
10.1103/PhysRevB.95.235149
Publisher site
See Article on Publisher Site

Abstract

We report a detailed study of the transport properties of a β-Bi4I4 quasi-one-dimensional topological insulator. Electrical resistivity, thermoelectric power, thermal conductivity, and Hall coefficient measurements are consistent with the possible appearance of a charge-density-wave order at low temperatures. Both electrons and holes contribute to the conduction in β-Bi4I4 and the dominant type of charge carrier changes with temperature as a consequence of temperature-dependent carrier densities and mobilities. Measurements of resistivity and Seebeck coefficient under hydrostatic pressure up to 2 GPa show a shift of the charge-density-wave order to higher temperatures suggesting a strongly one-dimensional character at ambient pressure. Surprisingly, superconductivity is induced in β-Bi4I4 above 10 GPa with Tc of 4.0 K which is slightly decreasing upon increasing the pressure up to 20 GPa. Chemical characterization of the pressure-treated samples shows amorphization of β-Bi4I4 under pressure and rules out decomposition into Bi and BiI3 at room-temperature conditions.

Journal

Physical Review BAmerican Physical Society (APS)

Published: Jun 26, 2017

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