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The effect of oxygen/cobalt off-stoichiometry upon magnetism in CaBaCo 4 O 7 has been investigated. It is shown that the oxides CaBaCo 4 O 7+δ and CaBaCo 4−x O 7−δ (0≤x≤0.20) synthesized below 1100°C in air exhibit phase separation, where ferrimagnetic regions with T C ~56K to 64K coexist with regions of magnetic clusters. The latter are detected...
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