NMR evidence for a magnetic soliton lattice in the high-field phase of CuGeO3

We present copper NMR spectra obtained in the high magnetic field phase of the inorganic spin-Peierls compound CuGeO3. In the whole range 13-17 T, the observed line shapes bring clear evidence for the existence of a static incommensurate distribution of the local spin density S-z(i) corresponding to a magnetic soliton lattice. The absolute value of S-z at the top of a soliton is found equal to 0.065 at 1.4 K and 16.3 T. The temperature dependence of the amplitude of the local spin distribution is proportional to (1 - T/T-c)(0.32).