Physics – Condensed Matter – Superconductivity
Scientific paper
2010-09-08
Physical Review Letters 105, 237002 (2010)
Physics
Condensed Matter
Superconductivity
4 pages, 4 color figures. 2 authors added; new data included (Fig.4) and discussed. Accepted in PRL
Scientific paper
10.1103/PhysRevLett.105.237002
Directional point-contact Andreev-reflection (PCAR) measurements in Ba(Fe1-xCox)2As2 single crystals (Tc=24.5 K) indicate the presence of two superconducting gaps with no line nodes on the Fermi surface. The PCAR 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 ~ Omega_b(0).
Daghero Dario
Gonnelli Renato S.
Hellstrom E. E.
Jiang Jay J.
Stepanov Alexander V.
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