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Metallic ferromagnetism in an orbitally degenerate system of strongly correlated electrons

โœ Scribed by Leonid Didukh; Oleksandr Kramar; Yuriy Skorenkyy

Publisher
Elsevier Science
Year
2005
Tongue
English
Weight
162 KB
Volume
359-361
Category
Article
ISSN
0921-4526

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โœฆ Synopsis

Ferromagnetic ordering in a generalization of the Hubbard model with correlated hopping to the case of twofold orbital degeneracy has been studied. An effective Hamiltonian of the model has been derived for the case of strong intra-atomic Coulomb repulsion and strong Hund's rule coupling. The energy of the system and the magnetization in the ground state have been calculated for various densities of states. The magnetization at non-zero temperature and Curie temperature of system have been obtained numerically. The important peculiarity of the concentration dependence of Curie temperature is its decrease in some region of electron concentration with increase of magnetic moment. This allows us to interpret the peculiar behavior of Curie temperature in the compound Fe 1ร€x Co x S 2 with the change of conduction band filling.

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