Magnetic and Transport Properties of La0.5-xNdxBa0.5CoO3 Compounds
来源期刊：JOURNAL OF RARE EARTHS2003年第5期
论文作者：刘宜华 梅良模 张汝贞 季刚 黄宝歆 王成建
Key words：metal materials; La0.5-xNdxBa0.5CoO3 compounds; size effect; itinerant electrons; charge transfer; rare earths;
Abstract: Substituting effects of Nd for La in La0.5Ba0.5CoO3 compounds were studied systematically. The results show that Nd doping does not change the itinerant properties of the Co3d electrons. The molecular magnetic moment of the materials decreases monotonically with increasing Nd dopant. When Nd content x≥0.45, a magnetic phase separation appears in the materials. When x≤0.45, the Curie temperature decreases monotonically with increasing Nd dopant. This is due to the size effects of the rare earth ions. The electric resistance measurements show that in the studied temperature range, the conduction of the materials belongs to the thermo-diffusion conduction below the Curie temperature, while it belongs to the variable range hopping conduction of polarons over the Curie temperature.
刘宜华1，梅良模1，张汝贞1，季刚1，黄宝歆1，王成建1
(1.School of Physics and Microelectronics, Shandong University, Jinan 250100, China)
Abstract:Substituting effects of Nd for La in La0.5Ba0.5CoO3 compounds were studied systematically. The results show that Nd doping does not change the itinerant properties of the Co3d electrons. The molecular magnetic moment of the materials decreases monotonically with increasing Nd dopant. When Nd content x≥0.45, a magnetic phase separation appears in the materials. When x≤0.45, the Curie temperature decreases monotonically with increasing Nd dopant. This is due to the size effects of the rare earth ions. The electric resistance measurements show that in the studied temperature range, the conduction of the materials belongs to the thermo-diffusion conduction below the Curie temperature, while it belongs to the variable range hopping conduction of polarons over the Curie temperature.
Key words:metal materials; La0.5-xNdxBa0.5CoO3 compounds; size effect; itinerant electrons; charge transfer; rare earths;
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