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Polycrystalline perovskites Pr_0.7Ca_0.3MnO₃ and Pr_0.7Ca_0.3CoO₃ have been investigated by magnetization and ac susceptibility measurements. The magnetic measurements data indicate that the samples have, at low temperatures, similar properties to the frustrated magnets. The origin of this glassy behavior, in these phase separated perovskites, was found to be different in the manganite and cobaltite samples. While in Pr_0.7Ca_0.3MnO₃ the phase separation consists in ferromagnetic clusters embedded in an antiferromagnetic matrix, in Pr_0.7Ca_0.3CoO₃ the ferromagnetic clusters are surrounded by a paramagnetic (or spin glasslike) matrix.

Keywords: manganites, cobaltites, phase separation, spin glass