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

Article

关键词: FERROMAGNETIC SEMICONDUCTOR EUO;    RESONANT PHOTOEMISSION;    ELECTRONIC-STRUCTURE;    THIN-FILMS;    EXCHANGE;    MAGNETIZATION;    RELAXATION;    TRANSITION;    DEPENDENCE;    SILICON;   

DOI  :  10.1103/PhysRevB.86.224408

来源: SCIE

【 摘 要 】

The sign of the superexchange coupling J(2) between next-nearest neighboring Eu2+ magnetic moments in EuO is a matter subject to debate. We have obtained evidence that this coupling is of antiferromagnetic nature (J(2) < 0). EuO thin films grown at different temperatures suggest that lattice expansion results in enhancement of T-C as clearly observed in stoichiometric EuO films grown on CaF2 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.

【 授权许可】

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