Low-temperature heat-capacity study of the U6X (XMn, Fe, Co, Ni) compounds

K. N. Yang, M. B. Maple, L. E. Delong, J. G. Huber, A. Junod

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18 Scopus citations


Measurements of the superconducting- and normal-state heat capacity of U6X (XMn, Fe, Co, Ni) compounds have been performed over a temperature range 1 KT35 K. The U6X compounds have strong renormalizations of the free-carrier effective mass m* in the range 10mem*50me (mefree-electron mass). The unusual magnitude and temperature dependence of the U6X heat capacities suggest the presence of high densities of low-energy excitations of undetermined nature. The results are analyzed in terms of models appropriate to heavy-fermion liquids, and anisotropic or strong-coupled superconductors. The U6X compounds form a link between relatively low-m*, high-transition-temperature A15 compounds and the more extreme examples of heavy-fermion superconductors such as UBe13, UPt3, and CeCuSi2 for which m*102me.. AE

Original languageEnglish
Pages (from-to)151-166
Number of pages16
JournalPhysical Review B
Issue number1
StatePublished - 1989

ASJC Scopus subject areas

  • Condensed Matter Physics


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