Pressure-induced superconductivity and topological quantum phase transitions in 
a quasi-one-dimensional topological insulator: Bi4I4

Qi, Yanpeng; Shi, Wujun; Werner, Peter; Naumov, Pavel G.; Schnelle, Walter; Wang, Lei; Rana, Kumari Gaurav; Parkin, Stuart; Medvedev, Sergiy A.; Yan, B.; Felser, Claudia

doi:10.1038/s41535-018-0078-3

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Pressure-induced superconductivity and topological quantum phase transitions in a quasi-one-dimensional topological insulator: Bi₄I₄

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Yan, B.
Max Planck Institute for the Physics of Complex Systems, Max Planck Society;

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https://www.nature.com/articles/s41535-018-0078-3.pdf
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Citation

Qi, Y., Shi, W., Werner, P., Naumov, P. G., Schnelle, W., Wang, L., et al. (2018). Pressure-induced superconductivity and topological quantum phase transitions in a quasi-one-dimensional topological insulator: Bi₄I₄. npj Quantum Materials, 3: 4, pp. 1-6. doi:10.1038/s41535-018-0078-3.

Cite as: https://hdl.handle.net/21.11116/0000-0000-CEA3-0

Abstract

Superconductivity and topological quantum states are two frontier fields of research in modern condensed matter physics. The realization of superconductivity in topological materials is highly desired; however, superconductivity in such materials is typically limited to two-dimensional or three-dimensional materials and is far from being thoroughly investigated. In this work, we boost the electronic properties of the quasi-one-dimensional topological insulator bismuth iodide beta-Bi4I4 by applying high pressure. Superconductivity is observed in beta-Bi4I4 for pressures, where the temperature dependence of the resistivity changes from a semiconducting- like behavior to that of a normal metal. The superconducting transition temperature T-c increases with applied pressure and reaches a maximum value of 6 K at 23 GPa, followed by a slow decrease. Our theoretical calculations suggest the presence of multiple pressure-induced topological quantum phase transitions as well as a structural-electronic instability.