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 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.