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We present tunneling data from optimally-doped, superconductingBaFe1.86Co0.14As2 and its parent compound, BaFe2As2. In the superconductor,clear coherence-like peaks are seen across the whole field of view, and theiranalysis reveals nanoscale variations in the superconducting gap value, Delta.The average magnitude of 2Delta is ~7.4 kBTC, which exceeds the BCS weakcoupling value for either s- or d-wave superconductivity. The characteristiclength scales of the deviations from the average gap value, and of ananti-correlation discovered between the gap magnitude and the zero biasconductance, match well with the average separation between the Co dopant ionsin the superconducting FeAs planes. The tunneling spectra themselves possess apeak-dip-hump lineshape, suggestive of a coupling of the superconductingelectronic system to a well-defined bosonic mode of energy 4.7 kBTC, such asthe spin resonance observed recently in inelastic neutron scattering.

Nanoscale superconducting gap variations, strong coupling signatures and lack of phase separation in optimally doped BaFe1.86Co0.14As2