2003/09/15 by J. Jensen, P. Lemmens, C. Gros +1 · 28 citations
Chemistry · Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Antiferromagnetism #Chemistry #Condensed matter physics #Copper-based nanomaterials and applications #Crystallography #Excitation #Ion #Optics #Physics #Physics of Superconductivity and Magnetism #Raman scattering #Raman spectroscopy #Scattering #Spin (aerodynamics) #Spins #cond-mat.mtrl-sci #cond-mat.str-el
paper · pdf · doi:10.1209/epl/i2003-00281-7
published in Europhysics Letters (EPL) 64(5), 689-695 (Institute of Physics) · EPL, in press
arxiv created 2003/09/15 · openalex publication_date 2003/12/01 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
Raman light-scattering experiments in the antiferromagnetic phase of the Cu 2 Te 2 O 5 (Br 1 − x Cl x ) 2 compounds are analyzed in terms of a dimerized spin model for the tetrahedral Cu-clusters. It is shown that the longitudinal magnetic excitation in the pure Br system hybridizes with a localized singlet excitation due to the presence of a Dzyaloshinskii-Moriya anisotropy term. The drastic change of the magnetic scattering intensities observed when a proportion of Br is replaced by Cl ions, is proposed to be caused by a change of the magnetic order parameter. Instead of being parallel/antiparallel with each other, the spins in the two pairs of spin-½ order perpendicular to each other, when the composition x is larger than about 0.25.