Temperature-dependent spin resonance energy in iron pnictides and multiband s Eliashberg theory

Abstract

The phenomenology of iron-pnictides superconductors can be explained in the framework of a three bands s wave Eliashberg theory with only two free parameters plus a feedback effect i.e. the effect of the condensate on the antiferromagnetic spin fluctuactions responsible of the superconductivity in these compounds. I have examined the experimental data of four materials: LaFeAsO1-xFx, SmFeAsO1-xFx, Ba1-xKxFe2As2, and Ba(FexCo1-x)2As2 and I have found that it is possible to reproduce the experimental critical temperature and gap values in a moderate strong-coupling regime: ltot about 1.7-2.0.

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