Anisotropic Exchange Interaction between Non-magnetic Europium Cations in Eu_2O_3

Details Anisotropic Exchange Interaction between Non-magnetic Europium Cations in Eu_2O_3 Anisotropic Exchange Interaction between Non-magnetic Europium Cations in Eu_2O_3

2011-03-10

arxiv.org/abs/1103.2012v1

Physics

Condensed Matter

Strongly Correlated Electrons

18 pages, 7 figures

Scientific paper

The electronic structure of the cubic and (high pressure) hexagonal phases of Eu2O3 have been investigated by mean of full potential linearized augmented plane wave calculations, within the LDA+U method. For the cubic phase, the comparison between ferromagnetic and antiferromag- netic calculations shows that the exchange interaction is very weak and is therefore expected to have a negligible effect on the magnetic susceptibility. This is consistent with the experimental behavior of the susceptibility of solid solutions of Eu2O3 into A2O3 (A=Y, Lu, Sc). The calcu- lations performed for the high pressure hexagonal phase, on the other hand, show that there is an antiferromagnetic exchange interaction between nearest neighbor Eu ions, which should have a sizeable effect on the susceptibility. Our results allow us to discuss the existing theories.

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