Abstract
Neutron powder diffraction studies have been made for Dy(Cu1−xNix)2Si2 with x=0, 0.06, and 0.1. The diffraction patterns of DyCu2Si2 are consistent with the reported magnetic structure [k=(1/2,0,1/2)], the Néel temperature (TN=10 K) and the Dy magnetic moment (8.2 μB). The diffraction patterns of Dy(Cu0.94Ni0.06)2Si2 and Dy(Cu0.9Ni0.1)2Si2 are interpreted by the same commensurate antiferromagnetic structures with k=(1/2,0,1/2). The Néel temperatures of Dy(Cu0.94Ni0.06)2Si2 and Dy(Cu0.9Ni0.1)2Si2 are determined to be 7.5 and 6.5 K, respectively. The magnetic moments are 6.5 μB/Dy in the Dy(Cu0.94Ni0.06)2Si2 and 6.0 μB/Dy in the Dy(Cu0.9Ni0.1)2Si2. The magnetic moment decreases as the Ni concentration increases, whereas the Dy moment determined by the Mössbauer spectroscopy increases as x increases. There is a strong diffuse peak at the (1/2 0 1/2) position of Dy(Cu0.94Ni0.1)2Si2 which implies the existence of some kinds of short range ordering of Dy moments. This fact suggests that the local crystalline electric field with lowered symmetry breaks the perfect magnetic arrangement with k=(1/2,0,1/2)
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