Pressure-induced superconductivity in the weak topological insulator BiSe

Malavi, P and Paul, A and Bera, A and Muthu, DVS and Majhi, K and Kumar, PSA and Waghmare, UV and Sood, AK and Karmakar, S (2023) Pressure-induced superconductivity in the weak topological insulator BiSe. In: Physical Review B, 107 (2).

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Abstract

Layered BiSe in the trigonal P3¯m1 phase is a weak topological insulator and a candidate topological crystalline insulator. Here using structural, spectroscopic, resistance measurements at high pressure and density functional theory calculations, we report that BiSe exhibits a rich phase diagram with the emergence of superconductivity above 7 GPa. Structural transitions into SnSe-type energetically tangled orthorhombic structures and, subsequently, into a CsCl-type cubic structure having distinct superconducting properties are identified at 8 and 13 GPa, respectively. Superconductivity is preserved as the system transforms back to the trigonal phase upon release of pressure. Spin-orbit coupling plays a significant role in enhancement of Tc in the trigonal and cubic phases. In the orthorhombic Cmcm phase, Tc decreases monotonically with increasing pressure, whereas unusual pressure-independent Tc is observed in the cubic Pm3¯m phase. Theoretical analysis reveals topological surface states in the cubic phase. The emergence of superconductivity within the topological phases makes BiSe a candidate topological superconductor. © 2023 American Physical Society.

Item Type:	Journal Article
Publication:	Physical Review B
Publisher:	American Physical Society
Additional Information:	The copyright for this article belongs to American Physical Society.
Keywords:	Bismuth compounds; Cesium compounds; Density functional theory; Electric insulators; Layered semiconductors; Superconducting materials; Tellurium compounds; Tin compounds; Topological insulators; Topology, Crystalline insulators; Cubic phase; Density-functional theory calculations; High pressure; M1-phase; Pressure induced superconductivity; Resistance measurement; Rich phase; Topological insulators; Trigonal phase, Selenium compounds
Department/Centre:	Division of Physical & Mathematical Sciences > Physics
Date Deposited:	10 Feb 2023 08:24
Last Modified:	10 Feb 2023 08:24
URI:	https://eprints.iisc.ac.in/id/eprint/80150

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