Seminars Archive

Investigation of interplay between orbital and magnetic ordering by means of x-ray resonant scattering at the modern synchrotron radiation sources

Abstract
Many structural and electronic properties of transition metal magnetic materials can be understood by supposing that an orbital order appears in addition to the magnetic ordering, which can lead to a lattice transitions, lowering the crystal symmetries. The orbital ordering can be inferred by the crystal structure accompanied by Jahn-Teller distortion, which can be determined by standard scattering techniques. However, there are systems (like in V
2
O
3
) where orbital order is not accompanied by any cooperative Jahn-Teller phenomenon. In these cases and if the magnetism is involved, one can infer the existence of orbital order only by the knowledge of magnetic structure, which strongly depends on the occupied orbitals. We present the investigation by X-ray resonant scattering technique of orbital and magnetic long-range order of two systems in which the magnetic properties are influenced by the orbital occupancy.