Electron-phonon coupling and superconductivity in arsenic under pressure
Kevin T. Chan, Brad D. Malone, Marvin L. Cohen
DOI 10.1103/PhysRevB.86.094515 · Physical Review B
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Abstract
We perform first-principles calculations of the electronic structure, phonon dispersion, and electron-phonon coupling in elemental As at various pressures above and below the rhombohedral A7 to simple cubic (sc) structural transition. We find that the electron-phonon coupling constant λ, and hence the superconducting transition temperature Tc, is largest near the structural transition and decreases away from it. Changes in λ as a function of pressure are primarily explained by changes in the density of states at the Fermi level for pressures below the transition, and by changes in phonon frequency for pressures above the transition. Although the couplings to the Γ1 optical phonon mode (for A7) and the R phonon mode (for sc) are large, the contribution of these modes to λ for their respective structures is modest.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| As Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure unresolved | unknown |
| As Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | 10 GPa | unknown |
| As Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | 20 GPa | unknown |
| As Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | 30 GPa | unknown |
| As Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | 40 GPa | unknown |
| As Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | 50 GPa | unknown |
| Li Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 20 | Pressure not reported | unknown |
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