Abstract
We have substituted non-magnetic La in ferrimagnetic Ca 2− x La x FeMoO 6 double perovskite. The cell volume showed expansion with the increase of La substitution in monoclinic crystal structure and space group P2 I / n. Analysis of XRD spectrum indicated the increase of disorder in lattice structure. Surface structure of the material is modified from adhesive type for x = 0 sample to brittle type in La doped samples, suggesting the increase of grain boundary contributions. DC magnetization and ac susceptibility measurements showed reduction of magnetic moment, enhancement of T C, and cluster spin-glass phase in the ferromagnetic matrix. These experimental results confirmed the enhancement of magnetic disorder in La doped samples. The reduction of metallic nature in the compound provided additional support of enhanced disorder upon La doping in double perovskite structure.
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