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MA: Fachverband Magnetismus

MA 32: Postersession II: Spinstruct./Phase Trans. (1-10); Spinelectronics (11-15); Thin Films (16 - 36); Particles/Clusters (37-45); Multiferroics (46-54); Spindynamics/Spin Torque (55 - 76); Post Deadlines (77-79)

MA 32.1: Poster

Freitag, 29. Februar 2008, 11:15–14:00, Poster E

Neutron scattering studies on frustrated s=1/2 spin chain cuprates — •W. Lorenz^1,2, W.-D. Stein², A. Schneidewind³, T. Unruh³, B. Pedersen³, C. L. Zhang⁴, S.-W. Cheong⁴, O. Volkova⁵, A. Vasiliev⁵, S.-L. Drechsler¹, C. Hess¹, R. Klingeler¹, B. Büchner¹, and M. Loewenhaupt² — ¹IFW Dresden, Helmholtzstr. 20, 01069 Dresden, Germany — ²IFP (Institut für Festkörperphysik), TU Dresden, 01062 Dresden, Germany — ³Forschungsneutronenquelle Heinz Maier-Leibnitz , D-85748 Garching, Germany — ⁴Rutgers University, Piscataway, New Jersey 08854, USA — ⁵Moscow State University, 119992 Moscow, Russia

We report on neutron scattering studies on the frustrated s=1/2 spin chain cuprates LiCu₂O₂ and Li₂ZrCuO₄ and discuss these results against the background of their macroscopic properties. In both compounds, the interplay between nearest and next-nearest neigbor interactions yields a helical ground state. For LiCu₂O₂, results on the nuclear as well as on the magnetic structure have been determined, as well as preliminary data on the magnetic excitations. We will also present magnetic excitation spectra measured on Li₂ZrCuO₄ which is a new spin chain compound close to the critical frustration between helical and ferromagnetic in-chain order.