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Origin of Strong Coupling in Lithium under Pressure | | Deepa Kasinathan
; K. Koepernik
; J. Kunes
; H. Rosner
; W.E. Pickett
; | | Date: |
21 Jun 2006 | | Subject: | Superconductivity | | 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). | | Source: | arXiv, cond-mat/0606537 | | Services: | Forum | Review | PDF | Favorites | |
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