2006/09/08 by Natalia B. Perkins, Perkins, N. B., J. R. Iglesias +5
Physics and Astronomy · Materials Science · #Rare-earth and actinide compounds #Nuclear Materials and Properties #Advanced Chemical Physics Studies
paper · pdf · doi:10.48550/arxiv.cond-mat/0609199
Coexistence between ferromagnetic order and Kondo behavior has been observed in some uranium compounds. The underscreened Kondo lattice model can provide a possible description of this coexistence. Here we present a model of a lattice of S=1 spins coupled to the conduction electrons through an intra-site exchange interaction JK and an inter-site ferromagnetic exchange f-f interaction JH. Finite temperature results show that the Kondo temperature is larger than the Curie ordering temperature, TC, providing a possible scenario for the coexistence of Kondo effect and magnetic order. Also, the Kondo behavior disappears abruptly for low values of JK and smoothly when changing the band occupation. These results are in qualitative agreement with the experimental situation for the above mentioned uranium compounds.