Abstract
The easy-axis triangular antiferromagnet CsNiCl3 undergoes a magnetic phase transition to a triangular chirally ordered 120° type magnetic structure in an applied magnetic field of 2 T directed along the c axis. We studied by means of elastic neutron diffraction the crossover to chiral ordering. At B=2 T, the exponent of the sublattice magnetization β=0.25, which confirms the creation of the chirally ordered state. Data taken at B=1.75 T indicate that the crossover may be smeared out in B or is due to a slight misorientation of the applied field. The induced change in the magnetization direction of the ordered moments was also studied by means of SQUID magnetometry.
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