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|Type:||Artigo de periódico|
|Title:||The Role Of Cationic Disorder On The Magnetic Properties Of Double Perovskites (ca, Sr)2 - X Lax Feiro6|
Mendonca Ferreira L.
|Abstract:||We have synthesized polycrystalline samples of the series of double-perovskite (DP) type structure (Ca, Sr)2 - x Lax FeIrO6. Their structural and magnetic properties were investigated by experiments of X-ray powder diffraction, magnetic susceptibility and electrical resistivity. Both series crystallize in a monoclinic structure, space group P 21 / n (rather than in the triclinic I over(1, -)), with a significant degree of Fe/Ir 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 = 0.0 and 2.0, to ferrimagnetic for intermediate regions of the series. In this work we focus on the comparison of the physical properties of two representative compounds of these families, Ca1.2 La0.8 FeIrO6 and Sr1.2 La0.8 FeIrO6, which exhibit the higher magnetization within their series. For the Ca-based sample the disorder is around ~ 34% while was found to be roughly ~ 22 % for the Sr2 - x Lax FeIrO6 compound. © 2009 Elsevier B.V. All rights reserved.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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