Abstract
Nanocrystalline La0.7Sr0.3MnO3 films with thickness t=10-60nm were grown on LaAlO3(100) substrates by radio-frequency magnetron sputtering. Their electrical resistivity and low-field magnetoresistance (MR) were measured. Metal-insulator transitions occur above 275K for films with t=20-60nm, but the electron localization prevails in the 10nm thick film. Furthermore, only the 10nm thick film has an MR that depends on the inverse of temperature, consistent with the model of spin-polarized tunneling. This relationship may reflect a critical aspect of the structure of grain∕grain-boundaries. Accordingly, the tunneling MR in this film is 27% at 75K.
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