Pressure-induced phase transitions and superconductivity in a quasi-1-dimensional topological crystalline insulator α-Bi₄Br₄.

ABSTRACT: Great progress has been achieved in the research field of topological states of matter during the past decade. Recently, a quasi-1-dimensional bismuth bromide, Bi₄Br₄, has been predicted to be a rotational symmetry-protected topological crystalline insulator; it would also exhibit more exotic topological properties under pressure. Here, we report a thorough study of phase transitions and superconductivity in a quasihydrostatically pressurized α-Bi₄Br₄ crystal by performing detailed measurements of electrical resistance, alternating current magnetic susceptibility, and in situ high-pressure single-crystal X-ray diffraction together with first principles calculations. We find a pressure-induced insulator-metal transition between ∼3.0 and 3.8 GPa wh

SUBMITTER: Li X 

PROVIDER: S-EPMC6731639 | biostudies-literature | 2019 Sep

REPOSITORIES: biostudies-literature