Substituting Effect of Y in La0.5Ba0.5CoO3
来源期刊：JOURNAL OF RARE EARTHS2003年第3期
论文作者：刘宜华 梅良模 张汝贞 季刚 岳龙强 王成建
Key words：La0.5-xYxBa0.5CoO3 compound; charge transfer; non-colinear structure of spins; variable range hopping conduction; rare earths;
Abstract: La0.5-xYxBa0.5CoO3 polycrystals were prepared by solid state reaction. The substituting effects of Y for La on the magnetic and transport properties of the materials were studied systematically. The results indicate that substitution of Y induces two effects. Firstly, the charge transfer from Y to 3d orbital of Co happens. This causes the molecular magnetic moment to decrease. Secondly, the antiferromagnetic exchange interaction of Co ions appears. When the content of Y is less than or equal to 30%, the non-colinear structure of spins in materials is observed. When the content of Y is greater than 30%, the materials transit from predominant ferromagnetic state to predominant antiferromagnetic one. The conductive mechanism for the materials with different content of Y belongs to the variable range hopping conduction of polarons. The resistivity of materials increases sharply with increasing Y content.
刘宜华1，梅良模1，张汝贞1，季刚1，岳龙强1，王成建1
(1.School of Physics, Shandong University, Jinan 250100, China)
Abstract:La0.5-xYxBa0.5CoO3 polycrystals were prepared by solid state reaction. The substituting effects of Y for La on the magnetic and transport properties of the materials were studied systematically. The results indicate that substitution of Y induces two effects. Firstly, the charge transfer from Y to 3d orbital of Co happens. This causes the molecular magnetic moment to decrease. Secondly, the antiferromagnetic exchange interaction of Co ions appears. When the content of Y is less than or equal to 30%, the non-colinear structure of spins in materials is observed. When the content of Y is greater than 30%, the materials transit from predominant ferromagnetic state to predominant antiferromagnetic one. The conductive mechanism for the materials with different content of Y belongs to the variable range hopping conduction of polarons. The resistivity of materials increases sharply with increasing Y content.
Key words:La0.5-xYxBa0.5CoO3 compound; charge transfer; non-colinear structure of spins; variable range hopping conduction; rare earths;
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