Theory of Curie temperature enhancement in electron-doped EuO

Article

关键词: INSULATOR-METAL TRANSITION;    INDIRECT EXCHANGE;    FERROMAGNETISM;   

DOI  :  10.1103/PhysRevB.92.205119

来源: SCIE

【 摘 要 】

We present a comparative, theoretical study of the doping dependence of the critical temperature T-C of the ferromagnetic insulator-metal transitions in Gd-doped and O-deficient EuO, respectively. The strong T-C enhancement in Eu1-xGdxO is due to Kondo-like spin fluctuations on the Gd sites, which are absent in EuO1-x. Moreover, we find that the TC saturation in Eu1-xGdxO for large x is due to a reduced activation of dopant electrons into the conduction band, in agreement with experiments, rather than antiferromagnetic long-range contributions of the RKKY interaction. The results shed light on possibilities for further increasing T-C.

【 授权许可】

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