Spin and orbital ferromagnetism in strongly correlated itinerant electron systems

Details Spin and orbital ferromagnetism in strongly correlated itinerant electron systems Spin and orbital ferromagnetism in strongly correlated itinerant electron systems

2005-04-12

arxiv.org/abs/cond-mat/0504280v2

Phys.Rev.B72, 054421 (2005).

Physics

Condensed Matter

Strongly Correlated Electrons

12 pages, 4 figures, Revtex, PRB, accepted

Scientific paper

10.1103/PhysRevB.72.054421

Spectra of one-electron and collective excitations in narrow-band ferromagnets with unquenched orbital moments are calculated in various theoretical models. The interaction of spin and orbital excitations with conduction electrons results in the damping of the former which, however, turns out to be rather small; therefore, apart from usual spin waves, well-defined orbitons can exist. Non-quasiparticle states occur in the electron energy spectrum near the Fermi energy due to this interaction. The criteria of stability of the saturated spin and orbital ferromagnetic ordering are considered. Possible effects of orbital ordering in magnetite and in colossal magnetoresistance manganites are discussed.

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