Using a self-consistent mean-field approach to a disordered Hubbard model we show that, regardless of the role of correlation in the half-filled band for which the conventional phenomenology is recovered, correlation effects can be strongly enhanced by disorder in the low-filling limit, leading to a well-defined quasi-atomic domain of strong local moments on an inhomogeneous scale. We argue that the theory provides a natural origin for the observed behaviour of the Cs-rich liquid alloys Cu-Au close to stoichiometry.
LOCAL MOMENT FORMATION IN DISORDERED-SYSTEMS - A LOW-FILLING QUASI-ATOMIC LIMIT
SIRINGO, Fabio;
1991-01-01
Abstract
Using a self-consistent mean-field approach to a disordered Hubbard model we show that, regardless of the role of correlation in the half-filled band for which the conventional phenomenology is recovered, correlation effects can be strongly enhanced by disorder in the low-filling limit, leading to a well-defined quasi-atomic domain of strong local moments on an inhomogeneous scale. We argue that the theory provides a natural origin for the observed behaviour of the Cs-rich liquid alloys Cu-Au close to stoichiometry.File in questo prodotto:
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