Ferromagnetic Systems with Hopping Interaction

• Authors: G. Górski , J. Mizia
• Languages of publication: EN

Abstracts

EN

We analyze the influence of hopping interaction on magnetic ordering. Scattering scheme of the Hubbard III approximation with included inter-site kinetic electron-electron correlation is used. The hopping interaction and inter-site correlation lead to two spin dependent effects: the band width correction and the band-shift correction. The band-shift correction factor causes an exchange splitting between the spin-up and spin-down spectrum, and its role is similar to the exchange interaction in the classic Stoner model. The spin dependent band width correction enhanced strongly by the inter-site kinetic correlation lowers the kinetic energy of electrons by decreasing the majority spin band width for some electron occupations with respect to the minority spin band width. The results show that in the case of the symmetrical density of states there is only ferromagnetic enhancement. For the strongly asymmetrical density of states there is a ferromagnetic transition.

Keywords

EN

71.10.Fd; 75.10.Lp

Discipline

• 75.10.Lp: Band and itinerant models
• 71.10.Fd: Lattice fermion models (Hubbard model, etc.)

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2010
• Volume: 118
• Issue: 2
• Pages: 336-339

Dates

published

2010-08

Contributors

author

G. Górski

• Institute of Physics, University of Rzeszów, Rejtana 16A, 35-959 Rzeszów, Poland

author

J. Mizia

• Institute of Physics, University of Rzeszów, Rejtana 16A, 35-959 Rzeszów, Poland

References

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Identifiers

DOI

10.12693/APhysPolA.118.336