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

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2019
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Ranked #119 of 292 articles by views in Proceedings of the National Academy of Sciences of the United States of America

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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, BiBr, 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-BiBr 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 where valence and conduction bands cross the Fermi level to form a set of small pockets of holes and electrons. With further increase of pressure, 2 superconductive transitions emerge. One shows a sharp resistance drop to 0 near 6.8 K at 3.8 GPa; the transition temperature gradually lowers with increasing pressure and completely vanishes above 12.0 GPa. Another transition sets in around 9.0 K at 5.5 GPa and persists up to the highest pressure of 45.0 GPa studied in this work. Intriguingly, we find that the first superconducting phase might coexist with a nontrivial rotational symmetry-protected topology in the pressure range of ∼3.8 to 4.3 GPa; the second one is associated with a structural phase transition from monoclinic 2 to triclinic 1 symmetry.
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Authors Xiang Li, Dongyun Chen, Meiling Jin, Dashuai Ma, Yanfeng Ge, Jianping Sun, Wenhan Guo, Hao Sun, Junfeng Han, Wende Xiao, Junxi Duan, Qinsheng Wang, Cheng-Cheng Liu, Ruqiang Zou, Jinguang Cheng, Changqing Jin, Jianshi Zhou, John B Goodenough, Jinlong Zhu, Yugui Yao
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Journal Proceedings of the National Academy of Sciences of the United States of America
Year 2019
DOI
201909276
URL
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