Abstract
This paper presents results of a recent study of multiferroic CuCrO2 by means of single crystal neutron diffraction. This system has two close magnetic phase transitions at TN = 24.2 K and Tmf = 23.6 K. The low temperature magnetic structure below Tmf is unambiguously determined to be a fully three-dimensional proper screw. Between TN and Tmf antiferromagnetic order is found that is essentially two-dimensional. In this narrow temperature range, magnetic near neighbor correlations are still long range in the (H,K) plane, whereas nearest neighbors along the L direction are uncorrelated. Thus, the multiferroic state is realized only in the low temperature three-dimensional state and not in the two-dimensional state.
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