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Resistivity as a function of temperature for models with hot spots on the Fermi surface. | R. Hlubina
; T. M. Rice
; | Date: |
19 Dec 1994 | Subject: | cond-mat | Abstract: | We calculate the resistivity $
ho$ as a function of temperature $T$ 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 $
hopropto T^2$ 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 $
hopropto T^2ln(1/T)$. | Source: | arXiv, cond-mat/9501086 | Other source: | [GID 730815] pmid9977567 | Services: | Forum | Review | PDF | Favorites |
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