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The nature and value of the order parameters (OPs) in the superconductingFe-based oxypnictides REFeAsO_(1-x)F_x (RE = rare earth) are a matter ofintense debate, also connected to the pairing mechanism which is probablyunconventional. Point-contact Andreev-reflection experiments onLaFeAsO_(1-x)F_x gave us direct evidence of three energy scales in thesuperconducting state: a nodeless superconducting OP, Delta1 = 2.8-4.6 meV,which scales with the local Tc of the contact; a larger unconventional OP thatgives conductance peaks at 9.8-12 meV, apparently closes below Tc and decreaseson increasing the Tc of the contact; a pseudogaplike feature (i.e. a depressionin the conductance around zero bias), that survives in the normal state up toT* ~ 140 K (close to the Neel temperature of the undoped compound), which weassociate to antiferromagnetic spin fluctuations (AF SF) coexisting withsuperconductivity. These findings point toward a complex, unconventional natureof superconductivity in LaFeAsO_(1-x)F_x.

Coexistence of two order parameters and a pseudogaplike feature in the iron-based superconductor LaFeAsO_(1-x)F_x