Issue
EPL
Volume 81, Number 1, January 2008
Article Number 17006
Number of page(s) 6
Section Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties
DOI http://dx.doi.org/10.1209/0295-5075/81/17006
Published online 19 November 2007
EPL, 81 (2008) 17006
DOI: 10.1209/0295-5075/81/17006

Spin-liquid behavior in a kagomé antiferromagnet: Deuteronium jarosite

B. Fåk1, 2, F. C. Coomer3, A. Harrison3, D. Visser2, 4 and M. E. Zhitomirsky1

1  Département de Recherche Fondamentale sur la Matière Condensée, SPSMS, CEA Grenoble - 38054 Grenoble, France
2  ISIS Facility, Rutherford Appleton Laboratory - Chilton, Oxfordshire OX11 0QX, England, UK
3  School of Chemistry and EaStChem, The University of Edinburgh, The King's Buildings West Mains Road, Edinburgh EH9 3JJ, Scotland, UK
4  Department of Physics, University of Warwick - Coventry CV4 7AL, England, UK


received 16 August 2007; accepted in final form 29 October 2007; published January 2008
published online 19 November 2007

Abstract
The spin dynamics of the frustrated quasi$\hbox{--} $two-dimensional spin-5/2 Heisenberg antiferromagnetic kagomé compound deuteronium jarosite, (D3O)Fe3(SO4)2(OD)6, has been studied using inelastic neutron scattering. The dynamic magnetic susceptibility shows a clear spin-liquid behavior with strong dynamic short-range correlations with staggered chirality, as seen from the wave vector dependence at finite-energy transfers. The magnetic scattering at low temperatures is gapless and extends out to at least 20 meV. The dynamics shows a non-exponential relaxation behavior but no dynamical $\omega /T$ scaling. The characteristic energy (inverse relaxation rate) increases linearly with temperature.

PACS
75.40.Gb - Dynamic properties (dynamic susceptibility, spin waves, spin diffusion, dynamic scaling, etc.).
75.25.+z - Spin arrangements in magnetically ordered materials (including neutron and spin-polarized electron studies, synchrotron-source X-ray scattering, etc.).
78.70.Nx - Neutron inelastic scattering.

© EPLA 2008