Excitations of the field-induced soliton lattice in CuGeO3
M. Enderle, H. M. Roennow, D. F. McMorrow, L. P. Regnault, G. Dhalenne, A. Revcolevschi, P. Vorderwisch, H. Schneider, P. Smeibidl, M. Meissner
Abstract
Here we report the first inelastic neutron scattering study of the magnetic excitations in the incommensurate phase of a spin-Peierls material. The results on CuGeO3 provide direct evidence of a finite excitation gap, two sharp magnetic excitation branches and a very low-lying excitation which is identified as a phason mode, the Goldstone mode of the incommensurate soliton lattice.
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