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    題名: Comparison of the magnetization behaviors in perovskite compounds La 0.7-xLnxPb0.3MnO3 (Ln=Pr and Sm)
    作者: Young, S. L.;Horng, Lance;Ho, Y. W.;高惠春;Kao, H. C. I.;Chen, H. Z.
    貢獻者: 淡江大學化學學系
    關鍵詞: Magnetization;manganite;perovskite;ferromagnetism
    日期: 2005-01-30
    上傳時間: 2009-12-01
    出版者: World Scientific Publishing
    摘要: The magnetization behaviors of two manganite oxide systems, La0.7-xLnxPb0.3MnO3 (Ln=PrandSm), have been synthesized. The replacement of La ions by Pr or Sm results in a considerable decrease in the ferromagnetic ordering temperature TC and clearly irreversible behavior in the zero-field-cooling-field-cooling curve at a low applied field, showing a short-range spin order phase. These facts are in agreement with the smaller ionic radii of Pr (0.130 nm) and Sm (0.124 nm) ions in contrast to La ion (0.136 nm), and the corresponding larger distortion of perovskite structures. The saturation magnetization MS decreases as Sm content increases relative to the increase of MS as Pr content increases. This can be interpreted in terms of the competition between suppression of ferromagnetism due to structure tuning induced by the small ionic radius of the interpolated cations into the La-site and the increase of ferromagnetically interacting spins due to the introduction of magnetic Pr or Sm ions with f-shell electrons.
    關聯: International Journal of Modern Physics B 19(1-3), pp.563-568
    DOI: 10.1142/S0217979205029043
    顯示於類別:[化學工程與材料工程學系暨研究所] 期刊論文

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