Spin fluctuations effects on the low temperature properties of paramagnetic intermediate valence and Kondo compounds

Abstract

A generalization of the paramagnon theory to arbitrary band structures was previously shown to give a good phenomenologic description of the low temperature dependence of the paramagnetic susceptibility of CeIn3- xSnx. A discussion is presented here to complemente that study, including examination of the specific heat and applications to some other compounds like CeAl3. The nature of the low temperature transition to an ordered state, when it occurs, is also discussed as possibly be of ferro, antiferro, helimagnetic, excitonic or superconducting character. Possible applications to catalysis or triplet pairing superconductivity are examined.