A magnetic model for the incommensurate I phase of spin-Peierls systems
G. S. Uhrig, F. Schoenfeld, J. P. Boucher
Abstract
A magnetic model is proposed for describing the incommensurate I phase of spin-Peierls systems. Based on the harmonicity of the lattice distortion, its main ingredient is that the distortion of the lattice adjusts to the average magnetization such that the system is always gapful. The presence of dynamical incommensurabilities in the fluctuation spectra is also predicted. Recent experimental results for CuGeO3 obtained by NMR, ESR and light scattering absorption are well understood within this model.
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