Determination of the crystal and magnetic structure of the DyCrCO sub(4)-scheelite polymorph by neutron diffraction

Neutron diffraction data of DyCrO sub(4) oxide, prepared at 4 GPa and 833 K from the ambient pressure zircon-type, reveal that crystallize with the scheelite-type structure, space group I 4 sub(1)/a. Accompanying this structural phase transition induced by pressure the magnetic properties change dramatically from ferromagnetism in the case of zircon to antiferromagnetism for the scheelite polymorph with a TN = 19 K. The analysis of the neutron diffraction data obtained at 1.2 K has been used to determine the magnetic structure of this DyCrO sub(4)-scheelite oxide which can be described with a k = [0, 0, 0] as propagation vector, where the Dy and Cr moments are lying in the ab-plane of the scheelite structure. The ordered magnetic moments are 10 mu sub(B) and 1 mu sub(B) for Dy super(+3) and Cr super(+5) respectively.