Eur. Phys. J. B (2014) 87: 103
https://doi.org/10.1140/epjb/e2014-50007-7

Regular Article

Pseudofermion ferromagnetism in the Kondo lattices: a mean-field approach

Institute of Metal Physics, 620990 Ekaterinburg, Russia

^a e-mail: Valentin.Irkhin@imp.uran.ru

Received: 4 January 2014
Received in final form: 21 February 2014
Published online: 1 May 2014

Abstract

Ground state ferromagnetism of the Kondo lattices is investigated within slave fermion approach by Coleman and Andrei within a mean-field approximation in the effective hybridization model. Conditions for formation of both saturated (half-metallic) and non-saturated magnetic state are obtained for various lattices. A description in terms of universal functions which depend only on bare electron density of states (DOS) is presented. A crucial role of the energy dependence of the bare DOS (especially, of DOS peaks) for the small-moment ferromagnetism formation is demonstrated.