Abstract
The coefficient A of the T 2 term in the resistivity and the linear specific heat coefficient γ appear to have the relation A/ γ 2 = constant in heavy-fermion compounds. This is explained on the basis of large frequency dependence of the conduction-electron self-energy and the analytic properties of the self-energy. Nb 3Sn and V 3Si, typical A15 compounds, show the same universality, which strongly suggests that their large γ's are due to many-body effects as in heavy-fermion systems.
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