Anisotropic quasiparticle lifetimes in Fe-based superconductors

Details Anisotropic quasiparticle lifetimes in Fe-based superconductors Anisotropic quasiparticle lifetimes in Fe-based superconductors

2011-02-07

arxiv.org/abs/1102.1422v2

A. F. Kemper et al., Phys. Rev. B 83, 184516 (2011)

Physics

Condensed Matter

Superconductivity

10 pages, 9 figures

Scientific paper

10.1103/PhysRevB.83.184516

We study the dynamical quasiparticle scattering by spin and charge fluctuations in Fe-based pnictides within a five-orbital model with on-site interactions. The leading contribution to the scattering rate is calculated from the second-order diagrams with the polarization operator calculated in the random-phase approximation. We find one-particle scattering rates which are highly anisotropic on each Fermi surface sheet due to the momentum dependence of the spin susceptibility and the multi-orbital composition of each Fermi pocket. This fact, combined with the anisotropy of the effective mass, produces disparity between electrons and holes in conductivity, the Hall coefficient, and the Raman initial slope, in qualitative agreement with experimental data.

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