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It is shown that the quasi-universal ratio $q=\lim_{T\to0}eS/C\sim\pm1$ ofthe Seebeck coefficient to the specific heat in the limit of T=0 observed in aseries of strongly correlated metals can be understood on the basis of theFermi liquid theory description. In deriving this result, it is crucial that arelevant scattering arises from impurities, but not from the mutual scatteringof quasiparticles. The systematics of the sign of $q$ is shown to reflect thesign of the logarithmic derivative of the density of states and the inversemass tensor of the quasiparticles, explaining the systematics of experiments.In particular, the positive sign of $q$ for Ce-based and $f^{3}$-based heavyfermions, and the negative sign for Yb-based and $f^{2}$-based heavy fermions,are explained. The case of non-Fermi liquid near the quantum critical point(QCP) is briefly mentioned, showing that the ratio $q$ decreases considerablytoward antiferromagnetic QCP while it remains essentially unchanged for theferromagnetic QCP or QCP due to a local criticality.Comment: 12 pages, 1 figur

Theory of Quasi-Universal Ratio of Seebeck Coefficient to Specific Heat in Zero-Temperature Limit in Correlated Metals