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Charge and magnetic order in mixed valence systems
Author(s) -
Lemański R.
Publication year - 2005
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200460043
Subject(s) - antiferromagnetism , condensed matter physics , ferromagnetism , charge ordering , valence (chemistry) , ground state , physics , square lattice , lattice (music) , electron , chemistry , charge (physics) , quantum mechanics , ising model , acoustics
We analyze charge and magnetically ordered phases in systems described by a generalized Falicov‐Kimball model, with a spin‐dependent interaction term representing the Hund's rule. We study ground state properties of the model rigorously on the infinite 2D square lattice, but within the restricted configurational space, composed of all periodic phases (and their mixtures), for which the number of sites per unit cell is less or equal to 4. In the current work we focus on the mixed valence regime, where the total density of electrons is fixed and equal to 1. For a range of intermediate values of the interaction parameters we detected stable charge and magnetic superstructures of the form of stripes. They display various magnetic arrangements of the localized elctrons, including ferri‐ and antiferromagnetic, despite of the assumption of the ferromagnetic on‐site coupling. (© 2005 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)