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Magnetism and Strongly Correlated Electron Behavior in Intermetallics


ES 8

The understanding of complex magnetic structures and strongly correlated electron behaviour in intermetallic systems containing f-elements has been a continuing topic of research in the Solid State group. In this context a new uranium phase, UCu5.5 Ga0.5, presenting strong electronic correlations, was studied by magnetization, electrical resistivity and specific heat measurements. It shows a modified Curie-Weiss behaviour, with a reduced effective magnetic moment, a strongly negative paramagnetic Curie temperature and no hint of any transition down to 1.7 K. The low-temperature electronic specific heat is moderately enhanced, ~185 mJ/(mol K2), the proportionality C/T ~ T2 breaks down below 5 K and a slight logarithmic upturn is observed. The electrical resistivity behaves in a manner characteristic of systems with strong electronic correlations. The absence of any magnetic transition in UCu5.5Ga0.5 contrasts with the behaviour observed in the closely related UCu5M (M = Al, In, Sn) phases.


Contact person: António Gonçalves


Related reference(s):

Crystal structure and physical properties of UMo3B7", L. Salamakha, O. Sologub, C. Rizzoli, H. Michor, A.P. Gonҫalves, P. Rogl, E. Bauer, Intermetallics, 85 (2017) 1809-186. DOI: 10.1016/j.intermet.2017.02.009

The RMgSn2 Series of Compounds (R = Rare Earth Metal): Synthesis, Crystal Structure, and Magnetic Measurements", P. Solokha, R. Minetti, S. De Negri, L.C.J. Pereira, A.P. Gonçalves, A. Saccone, Eur. J. Inorg. Chem. 24 (2017) 3040-3047. DOI: 10.1002/ejic.201700280