A magnetic model for the incommensurate I phase of spin-Peierls systems
Institut für Theoretische Physik, Universität zu Köln - D-50937 Köln, Germany
2 Laboratoire de Spectrométrie Physique, Université J. Fourier Grenoble I, BP 87, F-38402 Saint-Martin d'Hères cedex, France
Accepted: 17 December 1997
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 obtained by NMR, ESR and light scattering absorption are well understood within this model.
PACS: 75.40.Gb – Dynamic properties (dynamic susceptibility, spin waves, spin diffusion, dynamic scaling, etc.) / 75.10.Jm – Quantized spin models / 75.50.Ee – Antiferromagnetics
© EDP Sciences, 1998