Impurity systems fluctuating between two magnetic configurations: candidates for non Fermiliquid behavior
Abstract
The appropriate generalization of the isotropic impurity Anderson model for valence fluctuations between two magnetic multiplets $l^n$ and $l^{n+1}$ is solved in the strongcoupling limit of Wilson's renormalization group for $l\leq$ 3. Except in the extreme case of $jj$ coupling, the ground state is degenerate, the impurity magnetic moment is very small and is overscreened by the conduction electrons. The strongcoupling fixed point turns out to be unstable. Thus, at low enough temperatures the physics of the systems should be governed by an intermediate coupling fixed point and non Fermiliquid behavior is expected.
 Publication:

arXiv eprints
 Pub Date:
 April 1993
 arXiv:
 arXiv:condmat/9304050
 Bibcode:
 1993cond.mat..4050A
 Keywords:

 Condensed Matter
 EPrint:
 12 pages,REVTEX,no figures,CNEACAB3027