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Dynamics in the dimerised and high field incommensurate phase of CuGeO3

P. H. M. van Loosdrecht, S. Huant, G. Martinez, G. Dhalenne, A. Revcolevschi

cond-matarXiv:cond-mat/9606056

Abstract

Temperature (2.3<T<40\ K) and magnetic field (0<B<17\ T) dependent far infrared absorption spectroscopy on the spin-Peierls coumpound CuGeO3\ has revealed several new absorption processes in both the dimerised and high field phase of CuGeO3. These results are discussed in terms of the modulation of the CuGeO3\ structure. At low fields this is the well known spin-Peierls dimerisation. At high fields the data strongly suggests a field dependent incommensurate modulation of the lattice as well as of the spin structure.

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