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VOLUME 74 (2001) | ISSUE 6 | PAGE 374
Combined strain and high pressure oxygen treatment effects and phase separation in La067Ca0.33MnO3 thin films
PACS: 75.50.Pp, 75.70.-i
Abstract
An evidence for phase separation in high-pressure oxygen treated  La0.67Ca0.33MnO3/(100)MgO thin films is presented. This phase separated state is not observed for the x=0.33 classical doping level neither for bulk material, nor for as prepared thin films. It originates from the combined influence of two factors: large strains due to the film-substrate lattice mismatch and high pressure (100 bar) annealing in oxygen. These factors weaken double exchange, drastically enhance low-field magnetoresistance, and lead to hysteresis phenomena. The experimental results are interpreted in terms of phase separation of the film volume into the ferromagnetic conductive matrix with inclusions of spin-glass-like clusters.