The role of cationic disorder on the magnetic properties of double perovskites

✍ Scribed by L. Bufaiçal; L. Mendonça Ferreira; R. Lora-Serrano; P.G. Pagliuso; A. Caytuero; E. Baggio-Saitovich

• Publisher: Elsevier Science
• Year: 2009
• Tongue: English
• Weight: 377 KB
• Volume: 404
• Category: Article
• ISSN: 0921-4526
• DOI: 10.1016/j.physb.2009.07.096

✦ Synopsis

We have synthesized polycrystalline samples of the series of double-perovskite (DP) type structure ðCa; SrÞ 2Àx La x FeIrO 6 . 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 P2 1 =n (rather than in the triclinic I1), 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 ¼ 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, Ca 1:2 La 0:8 FeIrO 6 and Sr 1:2 La 0:8 FeIrO 6 , 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 Sr 2Àx La x FeIrO 6 compound.