Abstract
We have investigated the effects of 24.3 at% Dy substitution on the La site in the ferromagnetic perovskite La 0.7 Ca 0.3 MnO 3 . Results show a randomly canted ferromagnetic state below 65 K with a reduced metal–insulator transition. There is no breakdown of ferromagnetic domain structure at T <65 K (covering the temperature range below 35 K where resistivity shows an upturn, indicating a reentrant transition to an insulating behaviour). Reduced geometrical tolerance factor and increased variance of the La-site ionic radius are responsible for the observed changes.
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