SYMMETRY AND DIMENSION OF THE MAGNON DISPERSION OF INORGANIC SPIN-PEIERLS SYSTEMS

The data on the dispersion of the magnetic excitations of CuGeO3 in th e spin-Peierls dimerized phase are analyzed. On the basis of the latti ce structure it is shown that even along the chains the d = 2 characte r cannot be neglected. The symmetry of the dispersion differs from the one assumed so far. The magnetic resonance data are reinterpreted. Th e possibility of interchain rather than intrachain frustration is disc ussed.