Abstract

During structure formation, at a stage where long-range periodicity does not yet exist, local spherical periodicity occurs optimizing the total energy along a spherical resonance between the electronic system and the self-organizing static structure. Here, we report on the structural features of a-Ge 50Sb 50 and a-Ga 65Te 35, compare both with other covalent systems of the liquid and amorphous state, and discuss them together with metallic and ionic systems. In semiconducting systems, additional to the spherical-periodic order, there are short ranging angular correlations (order at the spheres), improving the spherical resonance and hence the depth of a pseudogap at E F.

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