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Electric and Magneto Transport Studies Of La0.7A0.3mno3 (A = Sr, Ba) Thin Films Grown Using Chemical Solution Deposition

P. R. Yadav, D. G. Kuberkar, D. S. Rana4, S. K. Malik , Rohini. S. Chhatrala

La0.7A0.3MnO3 (where, A = Sr, Ba) manganite nanostructured thin films have been grown on LAO (100) substrate using Chemical Solution Deposition (CSD) technique. The Insulator-Metal (I-M) transition temperature, TP of ~368K and ~330K were obtained for LSMO and LBMO films respectively. Magnetoresistance (MR) vs. Field (H) isotherms reveal that MR enhances in the vicinit of TP and decreases at low temperature. The current-voltage (I-V) measurements carried out on these films in the temperature range 82K - 300K shows a linear I-V behavior up to 300K for LSMO film with a slight non-linearity at room temperature. The LBMO film exhibits an unusual non-linearity in IV characteristics in the temperature range studied which may be attributed to inhomogeneous distribution of strain resulting due to the nonuniform microstructure of LBMO film. Fitting of the electrical transport measurements in shows that, the Spin-flip scattering becomes dominant around TP in these film which is also reflected in MR studies.