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Eliashberg Analysis of Optical Spectra Reveals Strong Coupling of Charge Carriers to Spin Fluctuations in Superconducting Iron Pnictides

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arxiv 1006.5468 v1 pith:GMHPMGS2 submitted 2010-06-28 cond-mat.supr-con

Eliashberg Analysis of Optical Spectra Reveals Strong Coupling of Charge Carriers to Spin Fluctuations in Superconducting Iron Pnictides

D. Wu , N. Barisic , M. Dressel , G. H. Cao , Z-A. Xu , J. Carbotte , E. Schachinger This is my paper
classification cond-mat.supr-con
keywords spincarrierschargeeliashbergfluctuationsopticalpeakspectra
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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.

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