Abstract
The effect of oxygen isotope substitution on transport and magnetic properties is studied for (La 1− y Pr y ) 0.7Ca 0.3MnO 3 ceramics and thin films. The temperature dependence of electrical resistivity reveals the metal–insulator transition induced by the 16 O→ 18 O substitution at y=0.75 (ceramics) and y=0.5 (films on LaAlO 3). Neutron powder diffraction at y=0.75 demonstrates a striking difference between magnetic structures in the samples with 16 O and 18 O . Measurements of AC magnetic susceptibility allow us to analyze the magnetic phase diagram and its changes related to the isotope substitution.
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