Abstract
The effect of a non-magnetic Zn impurity on superconductivity in the LaFe1−yZnyAsO1−xFx system is studied systematically. In the presence of a Zn impurity, the superconducting (SC) transition temperature increases in the under-doped regime, remains unchanged in the optimally doped regime and is severely suppressed in the over-doped regime. Our results suggest a switch in the symmetry of the SC order parameters from an s-wave to s±- or d-wave states as the charge carrier doping increases in FeAs-based superconductors.
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