Temperature dependence of the superfluid density as a probe for multiple gaps in Ba(Fe0.9Co0.1)2As2: Manifestation of three weakly interacting condensates

A. E. Karakozov, S. Zapf, B. Gorshunov, Ya. G. Ponomarev, M. V. Magnitskaya, E. Zhukova, A. S. Prokhorov, V. B. Anzin, and S. Haindl
Phys. Rev. B 90, 014506 – Published 16 July 2014

Abstract

The knowledge about the gap size and structure is of utmost importance for a theory of the superconducting pairing mechanism. The number of superconducting gaps is an important part of the description and modeling of multiband systems such as the iron-based superconductors. Here, we present a study on the temperature dependence of the superfluid density, ρs(T), in Ba(Fe0.9Co0.1)2As2 obtained from terahertz spectra of conductivity and dielectric permittivity of thin film samples with critical temperatures Tc2022 K. We demonstrate that the temperature dependence of the superfluid density, ρs(T), can be explained best by a model of three interacting superconducting condensates. Our results refine the standard two-band approach for Co-doped BaFe2As2.

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  • Received 1 November 2013
  • Revised 25 June 2014

DOI:https://doi.org/10.1103/PhysRevB.90.014506

©2014 American Physical Society

Authors & Affiliations

A. E. Karakozov1, S. Zapf2, B. Gorshunov2,3,4,*, Ya. G. Ponomarev5, M. V. Magnitskaya1, E. Zhukova2,3,4, A. S. Prokhorov3,4, V. B. Anzin3,4, and S. Haindl6,7,†

  • 1L.F. Vereshchagin Institute of High Pressure Physics, Russian Academy of Sciences, 142190, Troitsk, Moscow, Russia
  • 21. Physikalisches Institut, Universität Stuttgart, 70550, Stuttgart, Germany
  • 3A. M. Prokhorov Institute of General Physics, Russian Academy of Sciences, 119991, Moscow, Russia
  • 4Moscow Institute of Physics and Technology (State University), 141700, Dolgoprudny, Moscow Region, Russia
  • 5Faculty of Physics, M. V. Lomonosov Moscow State University, 119991 Moscow, Russia
  • 6Institute for Solid State Research, Leibniz-Institute for Solid State and Materials Research Dresden, 01069 Dresden, Germany
  • 7Physikalisches Institut, Experimentalphysik II, University of Tübingen, 72076 Tübingen, Germany

  • *gorshunov@ran.gpi.ru
  • S.Haindl@ifw-dresden.de; silvia.haindl@uni-tuebingen.de

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Vol. 90, Iss. 1 — 1 July 2014

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