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TT: Tiefe Temperaturen

TT 25: Correlated Electrons - Poster Session

TT 25.16: Poster

Mittwoch, 29. März 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. Clayhold⁵ — ¹B.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 T_N=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.