Abstract
Neutron diffraction and magnetization measurements indicate that, at low temperatures, long-range magnetic order is present in UCO 2Si 2, UNi 2Si 2, UCu 2Si 2, UNi 2Ge 2, and UCo 2Ge 2. UCo 2Si 2 and UNi 2Ge 2 are simple collinear antiferromagnets of +-+- type, UCu 2Si 2 a simple collinear ferromagnet. In UNi 2Si 2, a magnetic phase transition from a LSW type structure to collinear antiferromagnetism of +-+- type was found, while in UCu 2Ge 2, the antiferromagnetic structure of ++-- transforms into collinear ferromagnetism. Crystal structure and magnetic parameters are given. No magnetic moment on transition metal ions was found within the accuracy of a powder neutron diffraction experiment. The stability of particular magnetic ordering schemes is discussed in terms of an isotropic RKKY mechanism.
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