Berlin 2008 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 30: Electron Theory

MA 30.7: Vortrag

Donnerstag, 28. Februar 2008, 16:00–16:15, H 1028

Electronic and magnetic properties of the nitrometalathes A₃[M^IIIN₃] — •Julia Wildeboer, Joanna Katarzyna Bendyna, Peter Höhn, Walter Schnelle, and Helge Rosner — Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Strasse 40, D-01187 Dresden

In solid state physics, geometrically frustated systems enjoy a steadily growing interest. The nitrometalathe compounds A₃[M^IIIN₃] have recently been synthesized. They crystallize in a hexagonal structure containing the planar complex [M^IIIN₃]⁶⁻ and form a frustated lattice of magnetically active transition metal ions.

We present an comparative experimental and theoretical study of the electronic and magnetic properties of these systems based on thermodynamical measurements; e.g. magnetic susceptibility and electrical resistivity, and density functional theory (DFT) calculations.

The DFT-based results support the experimental data: the compound Sr₃CrN₃ have a non-magnetic ground state whereas all other systems exhibit antiferromagnetic long ranged order.

Similarities and differences with respect to chemical bonding and exchange interaction will be discussed. The influence of strong coulomb repulsion on the transition metal sites will be investigated.