NMR imaging of the soliton lattice profile in the spin-peierls compound CuGeO3

in the spin-Peierls compound CuGeO3, the commensurate-incommensurate transi tion concerning the modulation of atomic position and the local spin polari zation is fully monitored (at T = 4 K similar or equal to zero-T limit) by the application of an external magnetic field (H) above a threshold value H -c similar or equal to 13 T. The solitonic profile of the spin polarization , as well as its absolute magnitude, has been precisely imaged from Cu-65 N MR line shapes obtained for h = (H - H-c)/H-c varying from 0.0015 to 1. Thi s offers a unique possibility to test quantitatively the various numerical and analytical methods developed to solve a generic Hamiltonian in 1D physi cs, namely strongly interacting fermions in the presence of electron-phonon coupling at arbitrary band filling.