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Elastic properties of the heavy fermion superconductor URu2Si2Wolf, B.; Sixl, W.; Graf, R.; Finsterbusch, D.; Bruls, G.; Luthi, B.; Knetsch, E.A.; Menovsky, A.A.; Mydosh, J.A. General rightsIt is not permitted to download or to forward/distribute the text or part of it without the consent of the author(s) and/or copyright holder(s), other than for strictly personal, individual use, unless the work is under an open content license (like Creative Commons). Disclaimer/Complaints regulationsIf you believe that digital publication of certain material infringes any of your rights or (privacy) interests, please let the Library know, stating your reasons. In case of a legitimate complaint, the Library will make the material inaccessible and/or remove it from the website. Please Ask the Library: http://uba.uva.nl/en/contact, or a letter to: Library of the University of Amsterdam, Secretariat, Singel 425, 1012 WP Amsterdam, The Netherlands. You will be contacted as soon as possible. Download date: 08 May 2018Journal of Low Temperature Physics, Vol. 94, Nos. 3/4, 1994

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We report on a detailed comparison of the thermodynamic properties of the heavy-fermion system CeCu6 which can be described as a Fermi liquid at low temperatures T < 0.1 K, and CeCus.9Auo.l where strong deviations from the Fermi-liquid behaviour were found previously in the T dependence of the specific heat C , magnetization M and electrical resistivity p. The specific heat, magnetization and elastic constants are investigated in a large range of magnetic fields, corroborating the idea that the non-Fermi-liquid behaviour arises from low-lying spin excitations. For the elastic constants, a striking linear T dependence is found for CeCus 9Auo I in contrast to the T2 Fermiliquid behaviour of CeCus.