Dresden 2009 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 29: Correlated Electrons: Low-dimensional Systems - Materials 2
TT 29.1: Vortrag
Mittwoch, 25. März 2009, 14:00–14:15, HSZ 301
Magnetic Structure and Interactions in the Quasi-1D Antiferromagnet CaV2O4 — •Oliver Pieper1,2, Bella Lake1,2, Aziz Daoud-Aladine3, Manfred Reehuis1,4, Karel Prokeš1, Bastian Klemke1, Klaus Kiefer1, Jiaqiang Yan5, Asad Niazi5, David C. Johnston5, and Andreas Honecker6 — 1Helmholtz-Zentrum Berlin für Materialien und Energie, Berlin, Germany — 2Technische Universität Berlin, Institut für Festkörperphysik, Berlin, Germany — 3ISIS Facility, Rutherford Appleton Lab, Chilton, UK — 4Max-Planck-Institut für Festkörperforschung, Stuttgart, Germany — 5Ames Lab. and Departement of Physics and Astronomy, Iowa State University, Ames, USA — 6Universität Göttingen, Institut für theoretische Physik, Göttingen, Germany
CaV2O4 is a spin-1 antiferromagnet where the magnetic vanadium ions are arranged on quasi-one-dimensional zig-zag chains with frustrated antiferromagnetic exchange interactions. Here we present high temperature susceptibility and single-crystal neutron diffraction measurements, which are used to deduce the magnetic structure, dominant exchange interactions and orbital configurations. The results suggest that at high temperatures of CaV2O4, the zig-zags behave as Haldane chains but at low temperatures, orbital ordering lifts the exchange frustration and the zig-zags become spin-1 ladders.