Abstract
The influence of oxygen content on the structural and magnetic properties of the layered Co-based perovskites PrBaCo 2 O 5 + δ ( 0.16 < δ < 0.80 ) was investigated by means of both X-ray diffraction and bulk magnetic measurements. An antiferromagnetic state is found for δ < 0.35 compounds. For the samples with an oxygen stoichiometry δ = 0.5 , a strong competition between ferro- and antiferromagnetic states exists in a narrow temperature range 180 < T < 250 K . For δ ∈ [0.35–0.7], the temperature and field dependencies of the magnetization measurements point toward the appearance of a cluster-glass, in which oxygen-rich and oxygen-poor clusters coexist. The long-range ferromagnetic order, observed for larger oxygen contents ( δ > 0.7 ), could thus be arising from the percolation of oxygen-rich ferromagnetic clusters.
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