Enhanced ferromagnetism from electron-electron interactions in double exchange type models

Details Enhanced ferromagnetism from electron-electron interactions in double exchange type models Enhanced ferromagnetism from electron-electron interactions in double exchange type models

2010-07-27

arxiv.org/abs/1007.4843v2

Phys. Rev. B 83, 134405 (2011)

Physics

Condensed Matter

Strongly Correlated Electrons

4 + epsilon pages, 3 figures

Scientific paper

10.1103/PhysRevB.83.134405

The magnetic properties of a variety of materials with promise for technological applications have been described by models in which fermions are coupled to local moment spins. Monte Carlo studies of such models usually ignore electron-electron interactions, even though the energy scale corresponding to these interactions may be comparable to or larger than other relevant energy scales. In this work we add on-site interactions between fermions to the double exchange model which we study with a Monte Carlo scheme in which temporal fluctuations of local moment spins are fully accounted for and electron-electron interactions are treated at a mean field level. We show that when the number of fermions is considerably less than the number of local moments even moderate interactions can lead to significant enhancement of ferromagnetism and the Curie temperature.

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