Spin and orbital ferromagnetism in strongly correlated itinerant electron systems

Abstract

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.

12 pages, 4 figures, Revtex, PRB, accepted

References in corpus (4)

• Temperature dependences of resistivity and magnetoresistivity for half-metallic ferromagnets
• Subgap transport in ferromagnet-superconductor junctions due to magnon-assisted Andreev reflection
• Density-of-states picture and stability of ferromagnetism in the highly-correlated Hubbard model
• Damped orbital excitations in the titanates

Cited by in corpus (5)

• Half-metallic ferromagnets: From band structure to many-body effects
• Spin-polarized scanning tunneling microscopy of half-metallic ferromagnets: Non-quasiparticle contributions
• A Modern Model Description of Magnetism
• A Contemporary Model Description of Magnetism
• Non-quasiparticle states in a half-metallic ferromagnet with antiferromagnetic $s-d(f)$ interaction