paper

Resistivity as a function of temperature for models with hot spots on the Fermi surface.

arXiv:cond-mat/9501086 · doi:10.1103/PhysRevB.51.9253

Abstract

We calculate the resistivity as a function of temperature for two models currently discussed in connection with high temperature superconductivity: nearly antiferromagnetic Fermi liquids and models with van Hove singularities on the Fermi surface. The resistivity is calculated semiclassicaly by making use of a Boltzmann equation which is formulated as a variational problem. For the model of nearly antiferromagnetic Fermi liquids we construct a better variational solution compared to the standard one and we find a new energy scale for the crossover to the behavior at low temperatures. This energy scale is finite even when the spin-fluctuations are assumed to be critical. The effect of additional impurity scattering is discussed. For the model with van Hove singularities a standard ansatz for the Boltzmann equation is sufficient to show that although the quasiparticle lifetime is anomalously short, the resistivity .

Revtex 3.0, 8 pages; figures available upon request. Submitted to Phys. Rev. B.

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