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DPG

Berlin 2012 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 19: Poster I: Multiferroics (jointly with MA, DF, KR, TT), Spins in organic materials (jointly with MA), FePt Nanoparticles (jointly with MA, MM)

DS 19.20: Poster

Dienstag, 27. März 2012, 12:15–15:15, Poster A

Structural and magnetic analysis of Vanadates — •Christine Tölzer1, Johanna Brand1, Masahiko Isobe2, Karsten Binder1, Timo Taetz3, María Teresa Fernández-Díaz5, Angela Möller3,4, Yutaka Ueda2, and Markus Braden11II. Institute of Physics, University of Cologne — 2Institute for Solid State Physics, University of Tokyo — 3Institute of Inorganic Chemistry, University of Cologne — 4Department of Chemistry and Texas Center for Superconductivity, University of Houston — 5Institute Laue-Langevin, Grenoble

We present the analysis of three different Vanadates: InCu2/3V1/3O3, Rb2V8O16 and ZnV2O4. The layered compound InCu2/3V1/3O3 is a representative of the quasi two-dimensional S=1/2 honeycomb lattice due to the ordering of Cu and V. A Néel-temperature near 38 K was deduced from anomalies in the magnetic susceptibility. We have studied the magnetic structure in InCu2/3V1/3O3 by neutron diffraction on the high-flux powder diffractometer D20. A rise in scattering upon cooling indicates magnetic ordering to set in near the anomaly observed in the susceptibility. Furthermore, we discuss the charge and orbital ordering in Rb2V8O16 and in ZnV2O4, as analysed by single-crystal x-ray diffraction as function of temperature.

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