Spin dynamics of the spin-Peierls compound CuGeO3 under magnetic field
D. Poilblanc, J. Riera, C. A. Hayward, C. Berthier, M. Horvatic
Abstract
The magnetic field--driven transition in the spin-Peierls system CuGeO3 associated with the closing of the spin gap is investigated numerically. The field dependence of the spin dynamical structure factor (seen by inelastic neutron scattering) and of the momentum dependent static susceptibility are calculated. In the dimerized phase (H<Hc), we suggest that the strong field dependence of the transverse susceptibility could be experimentally seen from the low temperature spin-echo relaxation rate 1/T2G or the second moment of the NMR spectrum. Above Hc low energy spin excitations appear at incommensurate wave vectors where the longitudinal susceptibility chizz(q) peaks.
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