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Dresden 2006 – scientific programme

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TT: Tiefe Temperaturen

TT 25: Correlated Electrons - Poster Session

TT 25.16: Poster

Wednesday, March 29, 2006, 14:30–18:30, P1

Excitation spectrum and magnetic properties of the layered Na5RbCu4(AsO4)4Cl2 — •V. Gnezdilov1, P. Scheib2, P. Lemmens2, Yu. Pashkevich3, D. Chervinskii3, K. Lamonova3, S. Zvyagin4, M. Ulutagay-Kartin5, S.-J. Hwu5, and J.A. Clayhold51B.I. Verkin Inst. for Low Temp. Physics, NASU, Ukraine — 2IPKM, TU Braunschweig, D-38106 Braunschweig, Germany — 3A.A. Galkin Donetsk Phystech, NASU, Ukraine — 4Hochfeld-Magnetlabor, Forschunszentrum Rossendorf, 01328 Dresden, Germany — 5Dept. Chem., Clemson Univ., Clemson, South Carolina 29634, USA

We report on a Raman scattering study on the Na5RbCu4(AsO4)4Cl2 compound with a remarkable layered lattice structure comprised of antiferromagnetically coupled square Cu4O4 tetramers and a magnetic transition at TN=17K. Due to the asymmetric exchange paths and the missing inversion centers an unique spectrum of magnetic excitations is observed and analyzed theoretically. This work has been supported partly by the ESF-HFM.

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