Issue
EPL
Volume 79, Number 1, July 2007
Article Number 17003
Number of page(s) 6
Section Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties
DOI http://dx.doi.org/10.1209/0295-5075/79/17003
Published online 06 June 2007
EPL, 79 (2007) 17003
DOI: 10.1209/0295-5075/79/17003

Standing spin waves in an antiferromagnetic molecular Cr6 horseshoe

S. T. Ochsenbein1, O. Waldmann1, A. Sieber1, G. Carver1, R. Bircher1, H. U. Güdel1, R. S. G. Davies2, G. A. Timco2, R. E. P. Winpenny2, H. Mutka3 and F. Fernandez-Alonso4

1  Department of Chemistry and Biochemistry, University of Bern - Freiestrasse 3, CH-3000 Bern 9, Switzerland
2  Department of Chemistry, The University of Manchester - Oxford Road, Manchester M13 9PL, UK
3  Institut Laue-Langevin - 6 Rue Jules Horowitz, BP 156-38042, Grenoble Cedex 9, France
4  ISIS Facility, CCLRC Rutherford Appleton Laboratory - Didcot OX11 0QX, UK


received 24 January 2007; accepted in final form 18 May 2007; published July 2007
published online 6 June 2007

Abstract
The antiferromagnetic molecular finite chain Cr6 was studied by inelastic neutron scattering. The observed magnetic excitations at 2.6 and 4.3 meV correspond, due to the open boundaries of a finite chain, to standing spin waves. The determined energy spectrum revealed an essentially classical spin structure. Hence, various spin-wave theories were investigated in order to assess their potential for describing the elementary excitations of finite spin systems.

PACS
75.10.Jm - Quantized spin models.
33.15.Kr - Electric and magnetic moments (and derivatives), polarizability, and magnetic susceptibility.
78.70.Nx - Neutron inelastic scattering.

© Europhysics Letters Association 2007