LOW-TEMPERATURE EXPANSION OF TRANSPORT COEFFICIENTS AND SPECIFIC HEAT OF FERMI LIQUIDS

The low-temperature expansion of the properties of Fermi liquids is discussed within the framework of Landau's theory. It is shown that the leading corrections to the low-temperature asymptotic forms come mainly from the scattering of quasiparticles with small energy and momentum transfer, and that they are proportional to T3 for the inverse mean free times for thermal conductivity and spin diffusion, and to T3lnT for the specific heat. The energy and damping of a quasiparticle are calculated from the same point of view. The special case of a nearly ferromagnetic Fermi liquid is considered explicitly, and comparison is made with results already obtained from a Green's-function approach, from the random-phase approximation, and from the concept of paramagnons." © 1968 The American Physical Society."