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Abstract
Powder neutron diffraction measurements have been carried out on RCuSb2 (R = Dy and Ho) compounds at low temperatures. These compounds crystallize in a tetragonal ZrCuSi2-type structure and are antiferromagnets with the Néel temperatures equal to 6.4K (R = Dy) and 4.5K (R = Ho). At 1.5K the magnetic order of DyCuSb2 can be described by the propagation vector k = (0, 0.119, 0.521). At the same temperature the magnetic order in HoCuSb2 is described by three propagation vectors: k1 = (0, 0.465, 0.260), k2 = (0, 0.408, 0.770) and k3 = (0, 0, 0.519). With increasing temperature the structure described by k1 disappears about 3.5K while the two other structures described by k2 and k3 are stable up to the Néel temperature. The Dy and Ho magnetic moments form a sine-wave modulated structure in the basal plane.
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