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Magnon dispersion in the field-induced magnetically ordered phase of TlCuCl3
Masashige Matsumoto1, B Normand, T M Rice
1Theoretische Physik, ETH-Hönggerberg, CH-8093 Zürich, Switzerland.
Physical Review Letters
|August 23, 2002
Abstract:
The magnetic properties of the interacting dimer system TlCuCl3 are investigated within a bond-operator formulation. The observed field-induced staggered magnetic order perpendicular to the field is described as a Bose condensation of magnons which are linear combinations of dimer singlet and triplet modes. This technique accounts for the magnetization curve and for the field dependence of the magnon dispersion curves observed by high-field neutron scattering measurements.