Correlation-enhanced Friedel oscillations in amorphous alloys and quasicrystals

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 $\chi (0,q)$ acquires a powerlaw divergence at $q=2k_F$ 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.

arXiv comment3 pages, 2 figures, RevTeX; to be published in proceedings of the 10th int. conference on liquid and amorphous metals LAM10, Physica C (1999)

References in corpus (2)

• Diagrammatic self-consistent theory of Anderson localization for the tight-binding model
• Quantum Interference of Coulomb Interaction and Disorder: Phase Shift of Friedel Oscillations and an Instability of the Fermi Sea