Ferromagnetism in the Anderson lattice model with the Falicov-Kimball interaction
INFM, Unità di Salerno and Dipartimento di Fisica
"E. R. Caianiello" Università di Salerno - I-84081 Baronissi
Accepted: 18 July 2001
We analyze the possible occurrence of ferromagnetism in the Anderson lattice model, generalized with the inclusion of the so-called Falicov-Kimball term, describing the on-site Coulomb repulsion between localized and itinerant electrons. We discuss the conditions under which a ferromagnetic ground state is established in one dimension when the number of electrons exceeds by one the number of sites. In particular, we show that the critical value of the localized electron site energy at which the magnetic transition occurs is considerably affected by the Falicov-Kimball interaction, as a consequence of the modification of the electron occupancies in the ground state.
PACS: 75.30.Mb – Valence fluctuation, Kondo lattice, and heavy-fermion phenomena / 75.20.Hr – Local moments in compounds and alloys; Kondo effect, valence fluctuations, heavy fermions
© EDP Sciences, 2001