Origin of Strong Coupling in Lithium under Pressure
Abstract
In an attempt to provide a clearer understanding of the impressive increase in T_c under pressure in elemental Li, linear response calculation of the phonon dispersion curves, electron-phonon matrix elements, phonon linewidths and mode lambda's have been carried out on a finer mesh (24^3 in the Brillouin zone) than done previously, for the volume corresponding to 20 GPa pressure. The result illustrates the great need for a fine mesh (even finer than this) for converged results of lambda and the spectral function alpha^2 F. Although the initial pressure-induced transverse T_1 phonon instability (in harmonic approximation) near the symmetry point K has dominated attention, the current results show that the high value of T_c gets strong contributions from elsewhere in the zone, particularly from the longitudinal mode along (100).
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Cite
@article{arxiv.cond-mat/0606537,
title = {Origin of Strong Coupling in Lithium under Pressure},
author = {Deepa Kasinathan and K. Koepernik and J. Kunes and H. Rosner and W. E. Pickett},
journal= {arXiv preprint arXiv:cond-mat/0606537},
year = {2009}
}
Comments
Proceedings for M2S