Volume 64, Number 5, December 2003
|Page(s)||689 - 695|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||01 November 2003|
Magnetic Raman scattering of the ordered tetrahedral spin- clusters in () compounds
Ørsted Laboratory, Niels Bohr Institute - Universitetsparken 5 DK-2100 Copenhagen, Denmark
2 Max Planck Institute for Solid State Research - D-70569 Stuttgart, Germany
3 Fakultät 7, Theoretische Physik, Universität des Saarlands D-66041 Saarbrücken, Germany
Accepted: 17 September 2003
Raman light-scattering experiments in the antiferromagnetic phase of the (x)2 compounds are analyzed in terms of a dimerized spin model for the tetrahedral -clusters. It is shown that the longitudinal magnetic excitation in the pure 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 is replaced by 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- order perpendicular to each other, when the composition x is larger than about 0.25.
PACS: 75.10.-b – General theory and models of magnetic ordering / 75.30.-m – Intrinsic properties of magnetically ordered materials / 78.30.-j – Infrared and Raman spectra
© EDP Sciences, 2003
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