Crossover of critical behavior in La_0.7Ca_0.3Mn_1−x

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• 作者：Xuebin Zhu ; Yuping Sun ; Xuan Luo ; Hechang Lei ; Bosen Wang ; Wenhai Song ; Zhaorong Yang ; Jianming Dai ; Dongqi Shi ; Shixue Dou
• 关键词：Colossal magnetoresistance ; Critical behavior
• 刊名：Journal of Magnetism and Magnetic Materials
• 出版年：2010
• 出版时间：January 2010
• 年：2010
• 卷：322
• 期：2
• 页码：242-246
• 全文大小：471 K

文摘

Critical behavior of Ti-doped La_0.7Ca_0.3MnO₃ ceramics are studied using magnetization methods. The results show that the paramagnetic–ferromagnetic transition is first order for the undoped sample, then for low-doping samples the mean-field model is suitable, and finally a 3D Heisenberg model is satisfied for higher doping samples. These findings demonstrate that the critical behavior of the magnetic transition for manganites is sensitive to Mn-site doping.