Pressure-induced superconductivity in the weak topological insulator BiSe
Pallavi Malavi, Arpita Paul, Achintya Bera, D. V. S. Muthu, Kunjalata Majhi, P S Anil Kumar, Umesh V. Waghmare, A. K. Sood, S. Karmakar
DOI 10.1103/PhysRevB.107.024506 · Physical Review B
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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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| BiSe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 7 | 5.8 GPa | onset |
| BiSe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 6.8 | 9.3 GPa | onset |
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