On the Theory of Metallic Lithium

  • T. Schneider
  • E. Stoll
Conference paper
Part of the The IBM Research Symposia Series book series (IRSS)


The pseudopotential formalism has been extensively applied to the interpretation of different physical properties of simple metals.1–3 However there are some well-known drawbacks to this approach, (i) Its use requires an accurate knowledge of both the core-state eigenfunctions and the core-state eigenvalues. Unfortunately these are not known very accurately. In fact the core-state eigenvalue shifts in the metal as compared to the free ion.4 For this reason model potentials have been introduced.4–7 However, Heine and Abarenkov,5 Ashcroft6 and Shaw7 make no attempt to base the shape of their model potentials on any physical principle. This and the missing information about the core shift show the importance of first-principle pseudopotentials. (ii) In reality, the electron gas screens the ionic pseudopotentials. This effect requires a knowledge of the dielectric function of the electron gas. However, there is still some uncertainty about the best approximation to include the effects of exchange and correlation.8–12


Dielectric Function Phonon Frequency Free Atom Phonon Dispersion Curve Relative Free Energy 
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Copyright information

© Plenum Press, New York 1972

Authors and Affiliations

  • T. Schneider
    • 1
  • E. Stoll
    • 1
  1. 1.IBM Zurich Research LaboratoryRüschlikonSwitzerland

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