title: Effects of Lifshitz transition on charge transport in magnetic phases of Fe-based superconductors.
abstract: The unusual temperature dependence of the resistivity and its in-plane anisotropy observed in the Fe-based superconducting materials, particularly Ba(Fe_{1-x}Co_{x})_{2}As_{2}, has been a long-standing puzzle. Here, we consider the effect of impurity scattering on the temperature dependence of the average resistivity within a simple two-band model of a dirty spin density wave metal. The sharp drop in resistivity below the Néel temperature T_{N} in the parent compound can only be understood in terms of a Lifshitz transition following Fermi surface reconstruction upon magnetic ordering. We show that the observed resistivity anisotropy in this phase, arising from nematic defect structures, is affected by the Lifshitz transition as well.
authors: Department of Physics, University of Florida, Gainesville, Florida 32611, USA.
authors: Y
authors: Y
authors: Wang
authors: Niels Bohr Institute, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen, Denmark.
authors: Maria N
authors: MN
authors: Gastiasoro
authors: Niels Bohr Institute, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen, Denmark.
authors: Brian M
authors: BM
authors: Andersen
authors: Institut für Theoretische Physik, Goethe-Universität Frankfurt, 60438 Frankfurt am Main, Germany.
authors: M
authors: M
authors: Tomić
authors: Institut für Theoretische Physik, Goethe-Universität Frankfurt, 60438 Frankfurt am Main, Germany.
authors: Harald O
authors: HO
authors: Jeschke
authors: Institut für Theoretische Physik, Goethe-Universität Frankfurt, 60438 Frankfurt am Main, Germany.
authors: Roser
authors: R
authors: Valentí
authors: Laboratoire Matériaux et Phénomènes Quantiques, Université Paris Diderot-Paris VII & CNRS, UMR 7162, 75205 Paris, France.
authors: Indranil
authors: I
authors: Paul
authors: Department of Physics, University of Florida, Gainesville, Florida 32611, USA.
authors: P J
authors: PJ
authors: Hirschfeld