The effect of Coulomb interaction at ferromagnetic-paramagnetic metallic perovskite junctions

Details The effect of Coulomb interaction at ferromagnetic-paramagnetic metallic perovskite junctions The effect of Coulomb interaction at ferromagnetic-paramagnetic metallic perovskite junctions

2008-09-17

arxiv.org/abs/0809.2984v1

Physics

Condensed Matter

Strongly Correlated Electrons

tex file and 7 figures

Scientific paper

10.1088/0953-8984/21/2/026005

We study the effect of Coulomb interactions in transition metal oxides junctions. In this paper we analyze charge transfer at the interface of a three layer ferromagnetic-paramagnetic-ferromagnetic metallic oxide system. We choose a charge model considering a few atomic planes within each layer and obtain results for the magnetic coupling between the ferromagnetic layers. For large number of planes in the paramagnetic spacer we find that the coupling oscillates with the same period as in RKKY but the amplitude is sensitive to the Coulomb energy. At small spacer thickness however, large differences may appear as function of : the number of electrons per atom in the ferromagnetics and paramagnetics materials, the dielectric constant at each component, and the charge defects at the interface plane emphasizing the effects of charge transfer.

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