Magnetic texturing due to the partial ordering of Fe+3 and Cu+2 in NdBaCuFeO5

The crystal and magnetic structure of the oxygen deficient double perovskite NdBaCuFeO5 was studied, using neutron powder diffraction data. The structure was refined from neutron powder diffraction data using the space groups P4/mmm and P4mm. For 2K⩽T⩽TN2=260K three families of magnetic Bragg peaks exist. These peaks can be indexed with commensurate propagation vectors k1=121212,k2=12120 and the incommensurate k3=12120.4. Above TN2 only magnetic Bragg peaks originated from k1 and k2 propagation, were observed. The incommensurate magnetic structure can be attributed to a circular inclined spiral ordering as in YBaCuFeO5 compound.