Anisotropic in-plane resistivity in the nematic phase of the iron pnictides

Details Anisotropic in-plane resistivity in the nematic phase of the iron pnictides Anisotropic in-plane resistivity in the nematic phase of the iron pnictides

2011-05-19

arxiv.org/abs/1105.3906v2

Phys. Rev. Lett. 107, 217002 (2011)

Physics

Condensed Matter

Strongly Correlated Electrons

revised version accepted in PRL; supplemental material included

Scientific paper

We show that the interference between scattering by impurities and by critical spin fluctuations gives rise to anisotropic transport in the Ising-nematic state of the iron pnictides. The effect is closely related to the non-Fermi liquid behavior of the resistivity near an antiferromagnetic quantum critical point. Our theory not only explains the observed sign of the resistivity anisotropy $\Delta\rho$ in electron doped systems, but also predicts a sign change of $\Delta\rho$ upon sufficient hole doping. Furthermore, our model naturally addresses the changes in $\Delta\rho$ upon sample annealing and alkaline-earth substitution.

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