Abstract
Neutron diffraction investigations have been performed to study themagnetization process of CsCuCl3 with the magnetic fieldaligned within the ab-plane. In zero field the stacked,triangular-lattice antiferromagnet (TLA) CsCuCl3 has a helicalstructure incommensurate in the chain direction normal to theab-plane. The magnetic phase diagram was investigated from2 K up to TN in fields up to 17 T. The phase line for theexpected incommensurate-commensurate (IC-C) phase transitioncould be determined throughout the whole phase diagram. At lowtemperature the IC-C transition is roughly at half thesaturation field HS. The neutron diffraction patterns werefound to be well described by a sinusoidally modulated spiral in fields up to HS/3. The initial increase of thescattering intensity in rising field indicates a continuousreduction of the spin frustration on the triangular lattice.Between HS/3 and HS/2 a new phase occurs wherethe spiral vector has a plateau in its field dependence. Closeto the IC-C transition a growing asymmetry of magneticsatellite-peak intensities indicates domain effects which arerelated to the lifting of the chiral degeneracy in the ab-plane in rising field. The phase diagram obtained has somesimilarities with those calculated for stackedTLAs by considering the effects ofquantum and thermal fluctuations.
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