Charge Ordering and Antiferromagnetic Transition in La_(0.67-x)Pr_xCa_(0.33)MnO_3 (x=0～0.67) Polycry

• 作 者: 曹晓明 卢遵铭 王立恒 李养贤
• 机 构: School of Material Science and Engineering Hebei University of Technology,School of Material Scienc
• 出 处: Journal of Rare Earths
• 发表日期: 2007年S1期
• 关键词: ferromagnetic magnetization doping perovskite distorted ordering metallic orthor

Polycrystalline samples of La0.67-xPrxCa0.33MnO3(x=0～0.67) were synthesized by a conventional solid state reaction. X-ray diffraction revealed that the samples were all of single phase with an orthorhombic distorted perovskite structure. The magnetization depended on temperature measured in FC (field cooling) and ZFC (zero field cooling). It revealed that the compounds mainly underwent a ferromagnetic transition (TC) when the less Pr doped (x<0.4). With increasing doping content (x>0.5), the ferromagnetic transition disappeared and the antiferromagnetic transition (TN) was dominant. Charge ordering (TCO) also emerged when x>0.36. The transition temperatures TN and TCO would change with the Pr doping content. The phase separation could be used to explain these characters occurred in these polycrystalline samples.

Polycrystalline samples of La0.67-xPrxCa0.33MnO3 (x = 0-0.67) were synthesized by a conventional solid state reaction. X-ray diffraction revealed the samples were all of single phase with an orthorhombic distorted perovskite structure. The magnetization depended on It shows that the compounds mainly underwent a ferromagnetic transition (TC) when the less Pr doped (x <0.4). With increasing doping content (x> 0.5), The transition temperatures TN and TCO would change with the Pr doping content. The phase separation could be used to explain these characters occurred in these polycrystalline samples.