Physics – Condensed Matter – Superconductivity
Scientific paper
2010-06-28
Physics
Condensed Matter
Superconductivity
4 pages, 2 figures
Scientific paper
10.1103/PhysRevB.82.144519
The temperature and frequency dependences of the optical conductivity of Co and Ni-doped BaFe2As2 are analyzed and the electron-boson spectral density a2F(w) extracted using Eliashberg's formalism. The characteristic energy of a large peak in the spectrum around 10 meV coincide with the resonance peak in the spin excitation spectra, giving compelling evidence that in iron-based superconductors spin fluctuations strongly couple to the charge carriers and mediate superconductivity. In addition the spectrum is found to evolve with temperature towards a less structured background at higher energies as in the spin susceptibility.
Barišić Neven
Cao G.-H.
Carbotte J.
Dressel Martin
Schachinger Ewald
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