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In iron-based superconductors in-plane anisotropy of electrical resistivity in strain-detwinned samples strongly depends on residual resistivity [1]. The mechanism of the electronic transport responcible for sign change of in-plane resistivity anisotropy in hole-doped (Ba,K)Fe₂As₂ [2] attracts notable interest, since contributions from both elestic scattering due to impurities/defects and inelastic scattering on magnetic excitations and phonons can be anisotropic. We use irradiation with relativistic 2.5 MeV electrons at low temperatures to change residual resistivity and study the contribution of elastic scattering into anisotropic electronic transport.The modification of detwinning technique enabled measurements of the same samples before and after irradiation.
X Prefer Oral Session

[1] S. Ishida, et. al., Phys. Rev. B 84, 184514 (2011).
[2] E.C. Blomberg, et. al., Nature Comm. 4, 1914 (2013).