title: The spin dynamics in distorted kagome lattices: a comparative Raman study.
abstract: Despite the conceptional importance of realizing spin liquids in solid states only few compounds are known. On the other hand the effect of lattice distortions and anisotropies on the magnetic exchange topology and the fluctuation spectrum is an interesting problem. We compare the excitation spectra of the two s = 1/2 kagome lattice compounds, volborthite and vesignieite, using Raman scattering. We demonstrate that even small modifications of the crystal structure may have a huge effect on the phonon spectrum and low-temperature properties.
authors.affiliation: Institute for Condensed Matter Physics, Technical University of Braunschweig, D-38106 Braunschweig, Germany. d.wulferding@tu-bs.de
authors.forename: D
authors.initials: D
authors.lastname: Wulferding
authors.forename: P
authors.initials: P
authors.lastname: Lemmens
authors.forename: H
authors.initials: H
authors.lastname: Yoshida
authors.forename: Y
authors.initials: Y
authors.lastname: Okamoto
authors.forename: Z
authors.initials: Z
authors.lastname: Hiroi