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#### Pressure-induced superconductivity and topological quantum phase
transitions in a quasi-one-dimensional topological insulator: Bi_{4}I_{4}

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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:
Bi_{4}I_{4}.* 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-B858-E

##### 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.