Institution: | aDpto. Química Inorgánica and Laboratorio de Química del Estado Sólido, Facultad de Ciencias Químicas, Universidad Complutense, Ciudad Universitaria, Madrid 28040, Spain bInstitut Laue-Langevin, BP 156X, F-38042 Grenoble Cedex, France |
Abstract: | The crystal and magnetic structure of Sr2ErRuO6 has been studied by means of neutron powder diffraction as well as magnetization and susceptibility measurements. Neutron diffraction profile measured at 50 K shows that the Ru5+ and Er3+ are ordered in the B-sites of the perovskite-type structure, while the Sr atoms occupy the A-site. This compound crystallizes with a monoclinic unit cell, space group P21/n and lattice parameters are approximately √2ap × √2ap × 2ap. Magnetic susceptibility measurements reveal the existence of antiferromagnetic interactions in which Ru5+ and Er3+ sublattices are involved. The field dependence of the magnetization indicates the presence of a weak ferromagnetic component at the transition temperature, arising from the spin canting of the antiferromagnetically ordered Ru5+ and Er3+ moments. Thermal evolution of the neutron diffraction patterns indicate that the Nèel temperature is 36 K and the magnetic reflections can be indexed on the basis of a propagation vector k = 0, 0, 0]. The spin arrangement is described by the AxAz magnetic modes where the Ru5+ and Er3+ moments are mainly aligned along the c-axis of the structure, forming an angle of 6° with the c-axis in the case of the Er3+ sublattice and 15° for the Ru5+ moment. |