Magnetic Properties of the Fluorite-Related La3MO7 Phases, M=Ru and Os Local Moment Magnetism, Short- and Long-Range Order in 4d and 5d Transition Metal Oxides

The oxide materials La3MO7, M=Ru and Os have been prepared, the Os phase for the first time. Both crystallize in a fluorite-related supercell with Cmcm symmetry with very similar lattice constants. A singular feature of this structure type is the presence of well- separated zig-zag chains of corner-sharing MO6 octahedra parallel to one of the orthorhombic axes. Local moment magnetic behavior is observed for both on very different energy scales. …