Eliashberg approach to infrared anomalies induced by the superconducting state of Ba(0.68)K(0.32)Fe(2)As(2) single crystals

A. Charnukha, O.V. Dolgov, Alexandre Avraamovitch Golubov, Y. Matiks, D.L. Sun, C.T. Lin, B. Keimer, A.V. Boris

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We report the full complex dielectric function of high-purity Ba0.68K0.32Fe2As2 single crystals with Tc=38.5K determined by wideband spectroscopic ellipsometry at temperatures 10≤T≤300K. We discuss the microscopic origin of superconductivity-induced infrared optical anomalies in the framework of a multiband Eliashberg theory with two distinct superconducting gap energies, 2ΔA≈6kBTc and 2ΔB≈2.2kBTc. The observed unusual suppression of the optical conductivity in the superconducting state at energies up to 14kBTc can be ascribed to spin-fluctuation–assisted processes in the clean limit of the strong-coupling regime.
Original languageUndefined
Article number174511
Pages (from-to)-
Number of pages7
JournalPhysical review B: Condensed matter and materials physics
Issue number17
Publication statusPublished - 2011


  • IR-104469
  • METIS-283379

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