NMR imaging of the soliton lattice profile in the spin-Peierls compound CuGeO_3

Abstract

In the spin-Peierls compound CuGeO${}_3$, the commensurate-incommensurate transition concerning the modulation of atomic position and the local spin-polarization is fully monitored at T=0 by the application of an external magnetic field ($H$) above a threshold value $H_c\simeq$ 13 Tesla. The solitonic profile of the spin-polarization, as well as its absolute magnitude, has been precisely imaged from ${}^{65}Cu$ NMR lineshapes obtained for $h=(H-H_c)/H_c$ varying from 0.0015 to 2. This offers a unique possibility to test quantitatively the various numerical and analytical methods developed to solve a generic Hamiltonian in 1-D physics, namely strongly interacting fermions in presence of electron-phonon coupling at arbitrary band filling.

3 pages, 4 eps figures, RevTeX, submitted to Physical Review Letter

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