The role of crystal chemistry in YbCu5−xAux

•A new set of samples close to the inferior limit of the cubic phase was prepared.•Physical properties of YbCu4.6Au0.4 already deviates from the other samples.•Magnetic frustration seems to play a big role in the system.•Kondo temperature is always less than 2K at difference from previous data. The...

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Bibliographic Details
Published in:Journal of alloys and compounds 2015-04, Vol.627, p.20-24
Main Authors: Giovannini, M., Čurlík, I., Gastaldo, F., Reiffers, M., Sereni, J.G.
Format: Article
Language:English
Subjects:
Intermetallics
Kondo effect
Magnetoresistance
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Summary:•A new set of samples close to the inferior limit of the cubic phase was prepared.•Physical properties of YbCu4.6Au0.4 already deviates from the other samples.•Magnetic frustration seems to play a big role in the system.•Kondo temperature is always less than 2K at difference from previous data. The role of crystal chemistry in YbCu5−xAux crystallizing in the FCC AuBe5-type structure is highlighted through the study of the 0.7⩾x⩾0.4 region. Magnetic frustration, due to the magnetic Yb-ions forming a network of edge-sharing tetrahedra, seems to play an important role in the evolution of the ground state of the system. Significant differences are found among the YbCu5−xAux compounds compared to the cubic isotypic systems YbCu5−xAgx and YbCu5.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2014.12.049