Competition between Band Filling and Steric Effect in Ordered Double Perovskites Sr2-xLaxMnMoO6
来源期刊：JOURNAL OF RARE EARTHS2006年第6期
论文作者：Ji Xiangling Zhao Junchai Tian Shizhe Qiao Congde Jiang Bingzheng
Key words：double perovskite; band filling; steric effect; ferrimagnetism; rare earths;
Abstract: The ordered double perovskites, Sr2-xLaxMnMoO6, were prepared by sol-gel reaction. Structural, magnetic, and electrical properties were investigated for a series of ordered double perovskites Sr2-xLaxMnMoO6 (0≤x≤1). The compounds have a monoclinic structure (space group P21/n) and the cell volume expands monotonically with La doping. The TC and the magnetic moment rise and the cusp-like transition temperature below which the magnetic frustration occurs shifts to high temperature as x increases. With La doping, electrical resistivity of Sr2-xLaxMnMoO6 decreases only at low doping levels (x≤0.2); while at high doping levels (0.8≤x≤1), electrical resistivity tends to increase greatly. The results suggest that the competition between band filling effect and steric effect coexists in the whole doping range, and the formation of ferrimagnetic interactions is not simply at the expense of antiferromagnetic interactions.
Ji Xiangling1，Zhao Junchai1，Tian Shizhe1，Qiao Congde1，Jiang Bingzheng1
(1.State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China)
Abstract:The ordered double perovskites, Sr2-xLaxMnMoO6, were prepared by sol-gel reaction. Structural, magnetic, and electrical properties were investigated for a series of ordered double perovskites Sr2-xLaxMnMoO6 (0≤x≤1). The compounds have a monoclinic structure (space group P21/n) and the cell volume expands monotonically with La doping. The TC and the magnetic moment rise and the cusp-like transition temperature below which the magnetic frustration occurs shifts to high temperature as x increases. With La doping, electrical resistivity of Sr2-xLaxMnMoO6 decreases only at low doping levels (x≤0.2); while at high doping levels (0.8≤x≤1), electrical resistivity tends to increase greatly. The results suggest that the competition between band filling effect and steric effect coexists in the whole doping range, and the formation of ferrimagnetic interactions is not simply at the expense of antiferromagnetic interactions.
Key words:double perovskite; band filling; steric effect; ferrimagnetism; rare earths;
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