Sign-reversal of the in-plane resistivity anisotropy in hole-doped iron pnictides

Abstract

The in-plane anisotropy of the electrical resistivity across the coupled orthorhombic and magnetic transitions of the iron pnictides has been extensively studied in the parent and electron-doped compounds. All these studies universally show that the resistivity ${\rho }_a$ across the long orthorhombic axis $a_O$ - along which the spins couple antiferromagnetically below the magnetic transition temperature - is smaller than the resistivity ${\rho }_b$ of the short orthorhombic axis $b_O$, i. e. ${\rho }_a<{\rho }_b$. Here we report that in the hole-doped compounds Ba${}_{1-x}$K${}_x$Fe${}_2$As${}_2$, as the doping level increases, the resistivity anisotropy initially becomes vanishingly small, and eventually changes sign for sufficiently large doping, i. e. ${\rho }_b<{\rho }_a$. This observation is in agreement with a recent theoretical prediction that considers the anisotropic scattering of electrons by spin-fluctuations in the orthorhombic/nematic state.

This paper has been replaced by the new version offering new explanation of the experimental results first reported here

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