NMR imaging of the soliton lattice profile in the spin-Peierls compound CuGeO3
Abstract
In the spin-Peierls compound CuGeO3, 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 Hc 13 Tesla. The solitonic profile of the spin-polarization, as well as its absolute magnitude, has been precisely imaged from 65Cu NMR lineshapes obtained for h=(H-Hc)/Hc 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.
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