On Phonon Dispersion in Alkali Metals

Abstract

In the present paper, the calculatioii of the phonon dispersioii relations for alkali metals to second order in a local pseudopotential is discussed in terms of the real-space sum. Dicherent forms of dielectric functions are employed to judge the varying echects of exchange and correlation on the phonon frequencies. The quantitative agreement of phonon frequencies for the alkali metals reflects, satisfactorily, the experimental trend.

THE STUDY OF SUPERCONDUCTING STATE PARAMETERS OF in-BASED BINARY ALLOYS BY PSEUDOPOTENTIAL

“…Instead of using Vegard's law to obtain screened pseudopotential V (X) for binary mixture, we employed more successful approach of PAA model. 24,[33][34][35][36][37] The form factor V (q) used for the PAA model is (in a.u.) from our recent work.…”

Phonon dispersion relation of liquid metals

“…The attempts to study the phonon dispersion curves of liquid metals using the pseudopotential theory are very rare and not exhaustive [1][2][3]. Srivastava [1] and Gajjar et al [3] have reported the phonon dispersion of some simple liquid metals.…”

“…Srivastava [1] and Gajjar et al [3] have reported the phonon dispersion of some simple liquid metals. It was found that the maximum deviation takes place in the vicinity of the first spherical Brillouin zone.…”

Pseudopotential in the Study of Superconducting State Parameters of Metallic Glasses

“…But it is well established that pseudo-alloy-atom (PAA) is a more meaningful approach to explain such kind of interactions in binary systems. [4][5][6]13,14,17,18 Hence, in the present article, we have adopted PAA model to investigate the SSP of forty binary metallic glasses system.…”