Dynamics in the dimerised and high field incommensurate phase of CuGeO$_3$

TL;DR

This study uses far infrared spectroscopy to explore temperature and magnetic field effects on CuGeO$_3$, revealing new absorption processes linked to structural and magnetic modulations in different phases.

Contribution

It provides new insights into the field-dependent incommensurate lattice and spin structure modulations in CuGeO$_3$ using spectroscopy.

Findings

Identification of new absorption processes in different phases.

Evidence for field-dependent incommensurate modulations.

Correlation between structural changes and magnetic field effects.

Abstract

Temperature ($2.3<T<40$\ K) and magnetic field ($0<B<17$\ T) dependent far infrared absorption spectroscopy on the spin-Peierls coumpound CuGeO$_3$\ has revealed several new absorption processes in both the dimerised and high field phase of CuGeO$_3$. These results are discussed in terms of the modulation of the CuGeO$_3$\ 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.