Theory of disorder-limited transport anisotropy in Fe-based superconductors

ORAL

Abstract

The unusual temperature dependence of the resistivity and its in-plane anisotropy observed in the Fe-based superconducting materials, particularly BaFe$_2$As$_2$, has been a longstanding puzzle. Here we construct a crude phenomenological model of the scattering of electrons from dopant induced nematic impurity states which explains many qualitative features of these experiments. Within this model, the high-temperature transport anisotropy near the magnetic and structural transitions is due almost entirely to the disordered nematogens, while below $T_N$. Fermi surface reconstruction competes with this effect.

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Authors

  • Peter Hirschfeld

    Department of Physics, University of Florida, Gainesville, FL, Department of Physics, University of Florida, Gainesville, FL 32611, Department of Physics, University of Florida, Gainesville, FL 32611, USA, Unversity of Florida, Department of Physics, University of Florida

  • Yan Wang

    HI875049, Department of Physics, University of Florida, Gainesville, FL 32611, Department of Physics, University of Florida, Gainesville, FL 32611, USA

  • Indranil Paul

    University of Paris VII (Diderot)