The effect of the deposition temperature on the low-field magnetoresistance of polycrystalline La0.5Sr0.5MnO3thin films produced by pulsed laser deposition

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Pulsed laser deposition of La 0.5 Sr 0.5 MnO 3 (LSMO) thin films on quartz wafers at different deposition temperatures has been carried out. The microstructural, electrical and low-field magnetotransport properties of these films are evaluated as functions of the deposition temperature. The film crystallinity depends substantially on the deposition temperature. Significantly enhanced low-field magnetoresistance for the samples deposited from 570 °C to 600 °C, in which amorphous phase and polycrystalline phase coexist, is observed. The electrical and low-field magnetotransport properties of the thin films are explained by the two-channel model where insulating channels of variable-range-hopping conduction and metallic ones coexist.