Mott trasition in liquid gold-alkali alloys
By incorporating calculated liquid pair correlation functions into a tight binding model for the electronic structure of binary liquid alloys, we have developed a self consistent theory of the electronic and atomic structure of liquid alloys. Model calculations for the gold-alkali systems show the existence of a gap in the density of states if the ratio of the electronegativity -difference to the mean overlap integral exceeds a certain value.
For alloy exhibiting a gap, a metal non-metal transition occurs for concentrations in the neighbourhood of stochiometry. This metal nonmetal transition occurs for values of the atomic parameters lying between those of AuK and AuRb, in agreement with experimental results.
In the present paper we discuss how this Mott transition is related to electron correlations. The screening plays an important role and is governed by the electron density.
KeywordsHard Sphere Liquid Alloy Mott Transition Cayley Tree Thomas Fermi
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