Enhancement of Superconductivity by Anderson Localization in Three-Dimensional Crystalline Phase of BiSe
Pallavi Malavi, S. Karmakar
DOI 10.1103/PhysRevLett.134.196001 · Physical Review Letters
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Abstract
We report a remarkable enhancement of superconductivity near the Anderson metal-insulator transition in the three-dimensional (3D) BCS-superconductor bismuth selenide (BiSe). The SnSe-type orthorhombic BiSe is successfully stabilized upon decompression after this phase is formed at high pressure from the two-dimensional layered BiSe phase and the intrinsic disorder concomitantly approaches the localization threshold near ambient pressure. A dramatic enhancement of the superconducting transition temperature near the localization transition is associated with the sharp increase in the local density of states and significant increase in the background dielectric constant, hence providing a short-ranged Coulomb interaction. This study, for the first time, validates the theoretical formulation for the superconductivity enhancement in a 3D system near localization and demonstrates the novel compression-decompression route to induce high homogeneous disorder.
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. | 6 | 8 GPa | midpoint |
| BiSe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 9 | 0.1 GPa | midpoint |
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