Correlation-enhanced Friedel oscillations in amorphous alloys and quasicrystals
Johann Kroha
Abstract
We show that quantum correlations induced by electron-electron interactions in the presence of random impurity scattering can play an important role in the thermal stabilization of amorphous Hume-Rothery systems: When there is strong backscattering off local, concentrical ion clusters, the static electron density response χ(0,q) acquires a powerlaw divergence at q=2kF even at elevated temperature. This leads to an enhancement as well as to a systematical phase shift of the Friedel oscillations, both consistent with experiments. The possible importance of this effect in icosahedral quasicrystals is discussed.
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