Physical properties of disordered double-perovskite Ca2-xLa xFeIrO6

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作者：
Bufaįal, L. [1 ]
Mendoņa Ferreira, L. [1 ]
Lora-Serrano, R. [1 ]
Agüero, O. [1 ]
Torriani, I. [1 ]
Granado, E. [1 ]
Pagliuso, P.G. [1 ]
Caytuero, A. [2 ]
Baggio-Saitovich, E. [2 ]
机构：
[1] Instituto de Física Gleb Wataghin, UNICAMP, C.P. 6165, 13083-970 Campinas, São Paulo, Brazil
[2] Centro Brasileiro de Pesquisas Físicas (CBPF), 22290-180 Rio de Janeiro, Brazil
来源：
Journal of Applied Physics | 2008年 / 103卷 / 07期
关键词：
In this work we have synthesized polycrystalline samples for the series of double-perovskite Ca2-x Lax FeIr O6. Their structural and magnetic properties were investigated using experiments of magnetic susceptibility and x-ray powder diffraction. The Ca2-x Lax FeIr O6 compounds form in a monoclinic structure; space group P21n; with the presence of significant FeIr cationic disorder. Interestingly; our results indicate a change in the nature of the microscopic magnetic interaction induced by La doping; where the system seems to evolve from antiferromagnetic in the extremities of the series; x=0 (TN 75 K) and x=2.0; to ferrimagnetic in intermediate regions of the series. However; due to significant presence of disorder and strong competition between ferromagnetic and antiferromagnetic interactions; the saturation of the magnetization was not found to be larger than 0.1 μB Fe. © 2008 American Institute of Physics;
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