TY - JOUR
T1 - Low-temperature heat-capacity study of the U6X (XMn, Fe, Co, Ni) compounds
AU - Yang, K. N.
AU - Maple, M. B.
AU - Delong, L. E.
AU - Huber, J. G.
AU - Junod, A.
PY - 1989
Y1 - 1989
N2 - 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
AB - 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
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U2 - 10.1103/PhysRevB.39.151
DO - 10.1103/PhysRevB.39.151
M3 - Article
AN - SCOPUS:4243720898
SN - 0163-1829
VL - 39
SP - 151
EP - 166
JO - Physical Review B
JF - Physical Review B
IS - 1
ER -