Abstract
Abstract The new Pr2BaCoO5 crystallizes with orthorhombic symmetry, space group Immm and the lattice parameters are: a = 3.8246(3) A , b = 5.9942(5) A and c = 11.8539(9) A . Magnetic susceptibility measurements reveal the existence of one-dimensional antiferromagnetic interactions around the room temperature in the Co2+ sublattice for the isostructural Nd2BaCoO5 oxide. Below 20 K neutron diffraction data show three-dimensional antiferromagnetic ordering in which both the Co2+ and R3+ sublattices are involved. This transition involves a propagation vector k = [ 1 2 , 0, 1 2 ] in the case of the neodymium oxide; while the wave vector corresponding to the magnetic structure for the Ho2BaCoO5, which crystallizes in the Pnma space group, can be described as k = [0, 1 2 , 1 2 ] .
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