Dresden 2006 – scientific programme
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TT: Tiefe Temperaturen
TT 25: Correlated Electrons - Poster Session
TT 25.17: Poster
Wednesday, March 29, 2006, 14:30–18:30, P1
Excitation spectrum of the novel frustrated 2D s=1/2 system (CuCl)LaNb2O7 — •V. Gnezdilov1, P. Scheib2, P. Lemmens2, Yu.G. Pashkevich3, T. Kitano4, Y. Ajiro4, N. Oba4, K. Yoshimura4, and H. Kageyama4 — 1B.I. Verkin Inst. for Low Temp. Physics, NASU, Ukraine — 2IPKM, TU Braunschweig, D-38106 Braunschweig, Germany — 3A.A. Galkin Donetsk Phystech, NASU, 83144 Donetsk, Ukraine — 4Dept. Chem., Kyoto Univ., Kyoto 606-8502, Japan
We report on the magnetic properties and Raman scattering data of the double-layered perovskite (CuCl)LaNb2O7 with a square lattice of s=1/2, prepared by topotactic ion-exchange reactions. Thermodynamic and spectroscopic experiments show a spin gap of ≈ 2 meV. Evidence for competing ferro- and antiferromagnetic exchange pathes connecting nearest and second-nearest-neighbors, respectively, exist. The role of the lattice system for the magnetic properties is critically discussed. This work has been supported partly by the ESF-HFM.