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Raman light-scattering experiments in the antiferromagnetic phase of theCu_2Te_2O_5(Br_(1-x)Cl_x)_2 compounds are analyzed in terms of a dimerized spinmodel for the tetrahedral Cu-clusters. It is shown that the longitudinalmagnetic excitation in the pure Br system hybridizes with a localized singletexcitation due to the presence of a Dzyaloshinskii-Moriya anisotropy term. Thedrastic change of the magnetic scattering intensities observed when aproportion of Br is replaced by Cl ions, is proposed to be caused by a changeof the magnetic order parameter. Instead of being parallel/antiparallel witheach other, the spins in the two pairs of spin-1/2 order perpendicular to eachother, when the composition x is larger than about 0.25.Comment: EPL, in pres

europhysics letters

Magnetic Raman scattering of the ordered tetrahedral spin-½ clusters in Cu 2 Te 2 O 5 (Br 1 − x Cl x ) 2 compounds