NMR study of the high magnetic field incommensurate phase of the CuGeO3 spin-Peierls system

We present an overview of NMR data on the inorganic spin-Peierls compound CuGeO3 focusing on its high magnetic field incommensurate phase. In this phase, the analysis of the NMR line shape provide the first detailed microscopic picture of the local spin density corresponding to a magnetic soliton lattice. While on a qualitative level the temperature and magnetic field dependence of this soliton lattice correspond to the theoretical predictions, quantitative disagreements may provide important information on the effects of quasiparticle interactions, interchain coupling and magnetoelastic coupling. The field dependence of the line shape also indicates that the incommensurate phase may be divided into sub-phases with one hypothetical transition line situated near 26 T. (C) 1998 Elsevier Science B.V. All rights reserved.