Abstract
It is shown that nonadiabatic fluctuations of the soliton lattice in the spin-Peierls system lead to an important reduction of the NMR line widths. These fluctuations are the zero-point motion of the massless phasonic excitations. Furthermore, we show that the discrepancy of x-ray and NMR soliton widths can be understood as the difference between a distortive and a magnetic width. Their ratio is controlled by the frustration of the spin system. By this work, theoretical and experimental results can be reconciled in two important points.
- Received 17 February 1999
DOI:https://doi.org/10.1103/PhysRevB.60.9468
©1999 American Physical Society