On Phonon Dispersion in Alkali Metals |
| P.N. Gajjar, B.Y. Thakore, H.K. Patel and A.R. Jani Department of Physics, Sardar Patel University, Vallabh Vídyanagar 388 120, Gujarat, India |
| Received: December 30, 1994; revised version: May 12, 1995 |
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| In the present paper, the calculation of the phonon dispersion relations for alkali metals to second order in a local pseudopotential is discussed in terms of the real-space sum. Different forms of dielectric functions are employed to judge the varying effects of exchange and correlation on the phonon frequencies. The quantitative agreement of phonon frequencies for the alkali metals reflects, satisfactorily, the experimental trend. |
| DOI: 10.12693/APhysPolA.88.489 PACS numbers: 63.20.Dj, 71.25.Cx |