Eur. Phys. J. B 16, 81-84 (2000)
https://doi.org/10.1007/s100510070252

Spin-wave excitations in finite chain segments of the diluted one-dimensional Heisenberg antiferromagnet CsMn_1-xMg_xBr₃

¹ Laboratory for Neutron Scattering, Eidgenössische Technische Hochschule Zürich and Paul Scherrer Institut, 5232 Villigen PSI, Switzerland
² Department of Chemistry, Universität Bern, Freiestrasse 3, 3000 Bern 9, Switzerland

Corresponding author: ^a albert.furrer@psi.ch

Received: 31 December 1999
Published online: 15 July 2000

Abstract

The inelastic neutron scattering technique was employed to study the magnetic excitation spectra in the diluted one-dimensional Heisenberg antiferromagnet CsMn_1-xMg_xBr₃ (x=0, 0.05, 0.10, 0.25, 0.50). The spectral response is interpreted in terms of spin-wave excitations in finite chain segments of Mn²⁺ ions, which are found to exist as long as the chain length exceeds twice the wavelength of the spin excitation. This limit determines the crossover into the mesoscopic regime.