Hybridization Effects in UCu5-xAux Compounds

V.H. Tran Laboratoire Léon Brillouin, CEA-CNRS, CE-Saclay, 91191 Gif-Sur-Yvette Cedex, France and R. Troć W. Trzebiatowski Institute of Low Temperature and Structure Research, Polish Academy of Sciences, Okólna 2, 50-950 Wrocław, Poland

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We review the results of bulk and neutron diffraction measurements on the UCu5-xAux system crystallizing in the cubic AuBe5-type structure. The observed properties may be understood in the light of competition between Kondo effect and RKKY exchange interactions. Effects of 5f-ligand hybridization between the U-atoms occupying the 4a-sites and the Au- or/and Cu-atoms placed at the 4c- and 16e-positions, respectively, are supposed to be different. We show that the prefential occupation of 4c-sites by Au has a marked effect on the magnetic properties of the investigated system.

DOI: 10.12693/APhysPolA.85.287 PACS numbers: 71.28.+d