Abstract
YBaMnCoO 5 has been synthesized as an analogue of YBaFe 2O 5 and its properties studied as a function of temperature by neutron thermodiffractometry, electrical conductivity measurements, magnetization studies and differential scanning calorimetry. In contrast to YBaFe 2O 5, the title phase shows neither a long-range order of Mn and Co (charge ordering), nor a thermally induced mixing of their charges into a delocalized state (valence mixing). According to combined neutron and synchrotron X-ray powder diffraction, YBaMnCoO 5 is a tetragonal double-cell perovskite with Y and Ba ordered in layers so as to occupy 8-coordinate and 12-coordinate sites, respectively, and Mn and Co disordered over a square-pyramidal site. Magnetic susceptibility and neutron powder diffraction measurements reveal a spin-ordering transition at ∼ 195 K . The refined magnetic moment of 3.1 μ B (at 10 K) is confined to the ab plane and coupled antiferromagnetically to all six nearest Mn/Co neighbours.
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