Sign of the superexchange coupling between next-nearest neighbors in EuO

The sign of the superexchange coupling J sub(2) between next-nearest neighboring Eu super(2+) magnetic moments in EuO is a matter subject to debate. We have obtained evidence that this coupling is of antiferromagnetic nature (J sub(2) < 0). EuO thin films grown at different temperatures suggest t...

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Bibliographic Details
Published in:Physical review. B, Condensed matter and materials physics Condensed matter and materials physics, 2012-12, Vol.86 (22), Article 224408
Main Authors: Liu, Pan, Santana, Juan A.Colón, Dai, Qilin, Wang, Xianjie, Dowben, Peter A., Tang, Jinke
Format: Article
Language:English
Subjects:
Antiferromagnetism
Band spectra
Bands
Calcium fluoride
Condensed matter
Joining
Lattices
Thin films
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Summary:The sign of the superexchange coupling J sub(2) between next-nearest neighboring Eu super(2+) magnetic moments in EuO is a matter subject to debate. We have obtained evidence that this coupling is of antiferromagnetic nature (J sub(2) < 0). EuO thin films grown at different temperatures suggest that lattice expansion results in enhancement of T sub(C) as clearly observed in stoichiometric EuO films grown on CaF sub(2) substrates. Resonant photoemission spectroscopy provides compelling evidence of strong hybridization between O 2p and Eu 5d6s6p weighted bands, suggesting that strong superexchange may be mediated by oxygen, thus consistent with the observed antiferromagnetic behavior between the next-nearest neighboring Eu atoms via nearest neighbor oxygen in EuO.
ISSN:1098-0121
1550-235X
DOI:10.1103/PhysRevB.86.224408