Z. Domanski et al., INTERACTION BETWEEN HEAVY ELECTRONS MEDIATED BY ITINERANT ELECTRONS IN THE ASYMMETRIC HUBBARD-MODEL, Journal of magnetism and magnetic materials, 144, 1995, pp. 1205-1206
An interaction between two heavy electrons mediated by two light elect
rons is investigated within the asymmetric Hubbard model on finite sys
tems. The probability of finding one heavy electron at site I when the
other occupies site k is calculated by an approximative method. An ef
fective attraction is found to exist for a certain set of model parame
ters.