Abstract
The structural, magnetic and transport properties of La0.7(Ca1−ySry)0.3MnO3 films deposited on a LaAlO3 (001) single-crystalline substrate by rf-magnetron sputtering using “soft” (or powder) targets are investigated. It is found that at 0.3⩽y⩽0.5 both rhombohedral (R¯3c) and orthorhombic (Pnma) crystal phases are coexistent at room temperature, forming a nanoclustered microstructure. The clustered films manifest the two-stage magnetic and electronic transitions typical for phase-separated systems. It is shown that for 0.5⩾y⩾0 a nonlinear (almost parabolic) field-dependent magnetoresistance is typical at room temperature, while for 0.65⩽y⩽1.0 it transforms to a linear behavior. The magnetotransport properties of the films are explained within the framework of a field-dependent activation energy model. The magnetic phase diagram for the La0.7(Ca1−ySry)0.3MnO3 thin-film system is presented.
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