Abstract
To study the conduction electron states and ferromagnetism of electron-doped EuO theoretically, we have applied two approximations to the s-f model and compared their results: virtual crystal approximation (VCA) and dynamical coherent potential approximation (dynamical CPA). The results of both approximations explain the anomalous magnetization curve experimentally observed in Gd-doped EuO and/or Eu-rich EuO with a low electron density, while only the result of dynamical CPA can explain the electron-density dependence of the Curie temperature TC. The TC calculated by VCA shows the monotonous increase with electron density, while the TC calculated by dynamical CPA shows a maximum for a certain electron density. The mechanism of TC increase is also discussed.
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