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Linear potential and phonons in alkali-metals

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Czechoslovak Journal of Physics B Aims and scope

Abstract

Phonon dispersion, binding energy, compressibility and elastic constants of alkali-metals have been studied using a modified form of the Ashcroft potential and self-consistent form of electron screening due to Singwi et al. The proposed potential successfully reproduces the phonon spectra and other properties of all the five metals except for the crossover between Δ1 and Δ5 branches for lithium —which may be attributed to the very small amplitude of the form factors atq=2k F. An improvement corresponding to this effect could reproduce Kohnanomaly and the crossover simultaneously.

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Authors and Affiliations

  1. Department of Physics, University of Rajasthan, 302 004, Jaipur, India

    K. S. Sharma & C. M. Kachhava

Authors
  1. K. S. Sharma
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  2. C. M. Kachhava
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Additional information

A preliminary report of this work as applied to Na has appeared in Solid State Communications30 (1979), 749.

On leave from:Maharani Shri Jaya College, Bharatpur-321 001.

The authors express their deep sense of gratitude in Prof. T. Toya, Hokkaido University for continual encouragement and thankfully acknowledge the departmental facilities extended by Dr. M. P. Saksena, Head of the Department. One of the authors (K.S.S.) also thanks U.G.C. for providing him a teacher-fellowship.

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Sharma, K.S., Kachhava, C.M. Linear potential and phonons in alkali-metals. Czech J Phys 30, 531–540 (1980). https://doi.org/10.1007/BF01596302

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  • DOI: https://doi.org/10.1007/BF01596302

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