SIGNATURES OF HUBBARD TYPE INTERACTION IN MIXED-VALENT SYSTEMS

Abstract

The role of Hubbard type interaction between d-electrons has been studied using a four-site extended Falicov-Kimball model. A discontinuousvalence transition has been observed. Specific heat curves show a double-peak structure for E<E_c. Theeffect of this interaction on entropy has also been examined. A Curie contribution to susceptibility is noticed.