Abstract
Recently reported quasiparticle interference imaging in underdoped Ca(Fe${}_{1\ensuremath{-}x}$Co${}_{x}$)${}_{2}$As${}_{2}$ shows pronounced $C$${}_{2}$ asymmetry, which is interpreted as an indication of an electronic nematic phase with a unidirectional electron band, dispersive predominantly along the $b$ axis of this orthorhombic material. On the other hand, even more recent transport measurements on untwinned samples show near isotropy of the resistivity in the $\mathit{ab}$ plane, with slightly larger conductivity along $a$ (and not $b$). We show that, in fact, both sets of data are consistent with the calculated ab initio Fermi surfaces, which have a decisively broken $C$${}_{4}$ and yet similar Fermi velocity in both directions. This reconciles completely the apparent contradiction between the conclusions of the scanning tunneling microscopy and the transport experiments.
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