Abstract
R 2BaCoO 5 oxides (R=rare earth) have been studied by means of neutron powder diffraction. They present two structural types which belong to the orthorhombic space groups Immm and Pnma. Antiferromagnetic ordering of the R 3+ and Co 2+ sublattices takes place below T N<100 K. Different noncollinear spin arrangements and complex phase transitions from incommensurate to commensurate magnetic structures have been characterized.
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