Berlin 2012 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 20: Poster I - Biomagnetism, FePt Nanoparticles, Magnetic Particles/Clusters, Magnetic Materials, Magnetic Semiconductors, Half-metals/Oxides, Multiferroics, Topological Insulators, Spin structures/Phase transitions, Electron theory/Computational micromagnetics, Magnetic coupling phenomena/Exchange bias, Spin-dependent transport, Spin injection/spin currents, Magnetization/Demagnetization dynamics, Magnetic measurement techniques

MA 20.20: 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 Möller^3,4, Yutaka Ueda², and Markus Braden¹ — ¹II. 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: InCu_2/3V_1/3O₃, Rb₂V₈O₁₆ and ZnV₂O₄. The layered compound InCu_2/3V_1/3O₃ 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 InCu_2/3V_1/3O₃ 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.