Physics – Condensed Matter – Superconductivity
Scientific paper
2008-12-24
Phys. Rev. B 79, 220517(R) (2009)
Physics
Condensed Matter
Superconductivity
4 figures, corrected typos, reduced size of images
Scientific paper
10.1103/PhysRevB.79.220517
We present tunneling data from optimally-doped, superconducting BaFe1.86Co0.14As2 and its parent compound, BaFe2As2. In the superconductor, clear coherence-like peaks are seen across the whole field of view, and their analysis reveals nanoscale variations in the superconducting gap value, Delta. The average magnitude of 2Delta is ~7.4 kBTC, which exceeds the BCS weak coupling value for either s- or d-wave superconductivity. The characteristic length scales of the deviations from the average gap value, and of an anti-correlation discovered between the gap magnitude and the zero bias conductance, match well with the average separation between the Co dopant ions in the superconducting FeAs planes. The tunneling spectra themselves possess a peak-dip-hump lineshape, suggestive of a coupling of the superconducting electronic system to a well-defined bosonic mode of energy 4.7 kBTC, such as the spin resonance observed recently in inelastic neutron scattering.
Goedkoop J. B.
Golden Mark S.
Huang Yong-Yi
Huisman Robert
Jong Sanne de
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