Journal
PHYSICAL REVIEW LETTERS
Volume 105, Issue 23, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.105.237002
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Funding
- PRIN Project [2008XWLWF9-005]
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Directional point-contact Andreev-reflection measurements in Ba(Fe1-xCox)(2)As-2 single crystals (T-c = 24.5 K) indicate the presence of two superconducting gaps with no line nodes on the Fermi surface. The point-contact Andreev-reflection spectra also feature additional structures related to the electron-boson interaction, from which the characteristic boson energy Omega(b)(T) is obtained, very similar to the spin-resonance energy observed in neutron scattering experiments. Both the gaps and the additional structures can be reproduced within a three-band s +/- Eliashberg model by using an electron-boson spectral function peaked at Omega(0) = 12 meV similar or equal to Omega(b)(0).
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