Regensburg 2007 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 20: Correlated Electrons - Poster Session
TT 20.25: Poster
Wednesday, March 28, 2007, 14:00–17:45, Poster A
Magnetic properties and evidence for lattice instabilities of the frustrated 2D s=1/2 systems (CuCl)LaNb2O7 and (CuBr)LaNb2O7. — •Patric Scheib1, Vladimir Gnezdilov2, Peter Lemmens1, Yuri Georgii Pashkevich3, Kazuyoshi Yoshimura4, Yoshitami Ajiro4, Taro Kitano4, and Hiroshi Kageyama4 — 1Institut für Physik der kondensierten Materie, TU-Braunschweig, Braunschweig — 2Institute for Low Temperature Physics and Engineering, NASU, Kharkov, Ukraine — 3Donetsk Phystech, NASU, Ukraine — 4Department of Chemistry, Kyoto University, Kyoto, Japan
We report on the magnetic properties and raman scattering data of the double-layered perovskites (CuBr)LaNb2O7 and (CuCl)LaNb2O7 with a square lattice of s = 1/2 prepared by topotactic ion-exchange reactions. Evidence for competing ferro- and antiferromagnetic exchange pathes connecting nearest and second-nearest-neighbors, respectively, exist. Despite nearly identical structural parameters of the two compounds there is a different magnetic ground state. Work supported by DFG and ESF-HFM.