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Using controlled disorder to distinguish<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>s</mml:mi><mml:mo>±</mml:mo></mml:msub></mml:math>and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi>s</mml:mi><mml:mo>+</mml:mo></mml:msub><mml:msub><mml:mrow /><mml:mo>+</mml:mo></mml:msub></mml:mrow></mml:math>gap structure in Fe-based superconductors
We reconsider the effect of disorder on the properties of a superconductor characterized by a sign-changing order parameter appropriate for Fe-based materials. Within a simple two-band model, we calculate simultaneously ${T}_{c}$, the change in residual resistivity $\ensuremath{\Delta}{\ensuremath{\rho}}_{0}$, and the zero-energy density of states, and show how these results change for …