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Abstract. This paper presents results of a recent study of multiferroic CuCrO 2 by means of single crystal neutron diffraction. This system has two close magnetic phase transitions at T N1 = 24.2 K and T N2 = 23.6 K. The low temperature magnetic structure below T N2 is unambiguously determined to be a fully 3-dimensional proper screw. Between T N1 and T N2 antiferromagnetic order is found that is essentially 2-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 3-dimensional state and not in the 2-dimensional state.

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