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Magnetic Raman scattering of the ordered tetrahedral spin-½ clusters in Cu2Te2O5(Br1 − xClx)2 compounds

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2003 EDP Sciences
, , Citation J. Jensen et al 2003 EPL 64 689 DOI 10.1209/epl/i2003-00281-7

0295-5075/64/5/689

Abstract

Raman light-scattering experiments in the antiferromagnetic phase of the Cu2Te2O5(Br1 − xClx)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.

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10.1209/epl/i2003-00281-7