Abstract
New R 2BaCoO 5 compounds with R Dy, Er, Tm and Lu have been synthesized and characterized by X-ray powder diffraction. All of them are isostructural with the previously reported R 2BaCoO 5 where R Ho, Yb and Y. They crystallize in the Sm 2BaCuO 5 structural type and belong to the Pnma space group ( Z=4). The structural differences found between Pnma-R 2BaCoO 5 oxides and other related compounds are given. The magnetic properties of the whole family of oxides (R DyLu and Y) have been studied from magnetic susceptibility measurements, showing the presence of three-dimensional antiferromagnetic interactions at low temperatures ( T N < 5 K) for most of these oxides.
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