Extreme Electron-Phonon Coupling in Boron-based Layered Superconductors

Details Extreme Electron-Phonon Coupling in Boron-based Layered Superconductors Extreme Electron-Phonon Coupling in Boron-based Layered Superconductors

2002-07-23

arxiv.org/abs/cond-mat/0207542v2

Physics

Condensed Matter

Superconductivity

4 two-column pages, 4 figures. Equations simplified. Figure 4 changed. Comparison with new data included

Scientific paper

10.1103/PhysRevB.66.220502

The phonon-mode decomposition of the electron-phonon coupling in the MgB2-like system Li_{1-x}BC is explored using first principles calculations. It is found that the high temperature superconductivity of such systems results from extremely strong coupling to only ~2% of the phonon modes. Novel characteristics of E_2g branches include (1) ``mode lambda'' values of 25 and greater compared to a mean of $\sim 0.4$ for other modes, (2) a precipitous Kohn anomaly, and (3) E_2g phonon linewidths within a factor of ~2 of the frequency itself, indicating impending breakdown of linear electron-phonon theory. This behavior in borne out by recent inelastic x-ray scattering studies of MgB2 by Shukla et al.

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