Pressure effect and Superconductivity in $\beta$-Bi${}_4$I${}_4$ Topological Insulator

Abstract

We report a detailed study of the transport coefficients of $\beta$-Bi${}_4$I${}_4$ 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 $\beta$-Bi${}_4$I${}_4$ 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 $\beta$-Bi${}_4$I${}_4$ above 10 GPa with of 4.0 K which is slightly decreasing upon increasing the pressure up to 20 GPa. Chemical characterisation of the pressure-treated samples shows amorphization of $\beta$-Bi${}_4$I${}_4$ under pressure and rules out decomposition into Bi and BiI${}_3$ at room-temperature conditions.

arXiv comment20 pages, 8 figures

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Cited by in corpus (7)

• Purely rotational symmetry-protected topological crystalline insulator $\alpha$-Bi4Br4
• Quantum transport properties of beta-Bi4I4 near and well beyond the extreme quantum limit
• Pressure effect on the topologically nontrivial electronic state and transport of lutecium monobismuthide
• A robust weak topological insulator in a bismuth halide Bi4Br2I2
• Quasi-One-Dimensional Higher-Order Topological Insulators
• Mass Acquisition of Dirac Fermions in Bi4I4 by Spontaneous Symmetry Breaking
• Robust Weyl Semimetal and Pressure-induced Superconductivity in Quasi-One-Dimensional (NbSe4)2I