Extreme electron-phonon coupling in boron-based layered superconductors
J. M. An, S. Y. Savrasov, H. Rosner, W. E. Pickett
DOI 10.1103/PhysRevB.66.220502 · Physical Review B
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Abstract
The phonon-mode decomposition of the electron-phonon coupling in the MgB2-like system Li1−xBC is explored using first-principles calculations. It is found that the high-temperature superconductivity of such systems results from extremely strong coupling up to only ∼2% of the phonon modes. Noteworthy characteristics of E2g branches include (1) “mode λ” values of 25 and greater compared to a mean of ∼0.4 for other modes, (2) a precipitous Kohn anomaly, and (3) E2g phonon linewidths within a factor of ∼2 of the frequency itself, indicating impending breakdown of conventional electron-phonon theory. This behavior in borne out by recent inelastic x-ray scattering studies of MgB2 by Shukla et al.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Li0.75BC Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 34 | Pressure not reported | unknown |
| MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 40 | Pressure not reported | unknown |
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