Abstract
We present an angle-resolved photoelectron spectroscopy study of the changes in the electronic structure of electron-doped Ba(Fe${}_{1\ensuremath{-}x}$Co${}_{x}$)${}_{2}$As${}_{2}$ across the superconducting phase transition. By changing the polarization of the incoming light, we were able to observe the opening of the gap for the inner hole pocket $\ensuremath{\alpha}$ and to compare its behavior with the outer holelike band $\ensuremath{\beta}$. Measurements along high-symmetry directions show that the behavior of $\ensuremath{\beta}$ is consistent with an isotropic gap opening, while slight anisotropies are detected for the inner band $\ensuremath{\alpha}$. The implications of these results for the $s\ifmmode\pm\else\textpm\fi{}$ symmetry of the superconducting order parameter are discussed, in relation to the nature of the different iron orbitals contributing to the electronic structure of this multiband system.
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