Electrical conductivity of Fermi liquids. II. Quasiparticle transport

We develop a general theory of Fermi liquids to discuss the Kadowaki-Woods relation A proportional to gamma(2) between the coefficient A of the T-2 term in the resistivity sigma(-1) = AT(2) and gamma of the specific heat C = gamma T at low temperatures. We derive a formula for the ratio A/gamma(2) which is expressed as a product of two dimensionless parameters alpha and F, where alpha represents a coupling constant for quasiparticle scattering and F is a geometric factor determined by the shape of the Fermi surface. Then we argue that the universal ratio A/gamma(2) = 1.0 x 10(-5) mu Omega cm(mol K/mJ)(2) observed in heavy fermion compounds is reproduced under the conditions alpha similar to 1 and F similar to 20. The former is regarded as a universality of Fermi liquids in a strong coupling regime, and the latter is corroborated by evaluating F definitely in simple cases. It is noted that the proportional relation is just an example of the universal phenomena to be expected for the whole class of strong coupling Fermi liquids.