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Polycrystalline perovskite Pr0.7Ca0.3CoO3 and Pr0.5Ca0.5CoO3 have been investigated by electrical resistivity, magnetization, ac susceptibility, and mu SR measurements. The magnetic measurements data indicate that the samples have, at low temperatures, similar properties to the frustrated magnets. The muSR measurements, suggest the presence of magnetic clusters at low temperatures. The electrical behavior has the main features of conduction in a phase separated system: it shows negative magnetoresistance and it is controlled by grain-boundary effects.
Date of Publication: Nov. 2008