Correlation-enhanced Friedel oscillations in amorphous alloys and quasicrystals

Details Correlation-enhanced Friedel oscillations in amorphous alloys and quasicrystals Correlation-enhanced Friedel oscillations in amorphous alloys and quasicrystals

1998-10-07

arxiv.org/abs/cond-mat/9810068v1

J. Noncryst. Solids, 250-252, 865 (1999)

Physics

Condensed Matter

Materials Science

3 pages, 2 figures, RevTeX; to be published in proceedings of the 10th int. conference on liquid and amorphous metals LAM10, P

Scientific paper

10.1016/S0022-3093(99)00194-5

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.

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