aDepartment of Physics, University of California Davis, One Shields Avenue, Davis CA 95616, USA
bInstitute of Physics, AS CR, Prague, Czech Republic
Abstract
Using ab initio electronic structure calculations employing the LDA+Umethod we have investigated the exchangecoupling in materials containing Eu in Eu2+formal valency including: (i) insulating ferromagnets (EuO, EuS, EuSe,EuTe), and (ii) elemental metal BCC Eu. The total energies calculated with constrained magnetic structures weremapped on the Heisenberg Hamiltonian in order to investigate the thermodynamic properties. The mechanisms ofinter-site exchange, which differ between the studied systems, are discussed.
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