Effect of spin-orbit coupling on the electron-phonon interaction of the superconductors Pb and Tl
R. Heid, K.-P. Bohnen, I. Yu. Sklyadneva, E. V. Chulkov
DOI 10.1103/PhysRevB.81.174527 · Physical Review B
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Abstract
The influence of spin-orbit coupling (SOC) on the electron-phonon interaction and on the pairing strength is investigated for Pb and Tl within density-functional theory. For Pb we find that SOC increases the coupling constant λ by 44%, solving the longstanding puzzle of too small λ values obtained consistently in previous first-principles calculations. The origin of the SOC-induced enhancement of λ lies both in a softening of the phonon spectrum and in an increase in the electron-phonon coupling matrix elements. In contrast, for the neighboring element Tl only weak effects of SOC on the phonon spectrum and the electron-phonon interaction is obtained, leading to an overall reduction in λ by 12%. In both cases, the inclusion of SOC improves the agreement with experiment.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Pb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Tl Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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