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Correlation-enhanced Friedel oscillations in amorphous alloys and quasicrystals | | Johann Kroha
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7 Oct 1998 | | Journal: | J. Noncryst. Solids, 250-252, 865 (1999) | | Subject: | Materials Science; Disordered Systems and Neural Networks | cond-mat.mtrl-sci cond-mat.dis-nn | | Affiliation: | Universitat Karlsruhe | | 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. | | Source: | arXiv, cond-mat/9810068 | | Services: | Forum | Review | PDF | Favorites | |
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