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, , in obtained from terahertz spectra of conductivity and dielectric permittivity of thin film samples with critical temperatures K. We demonstrate that the temperature dependence of the superfluid density, , can be explained best by a model of three interacting superconducting condensates. Our results refine the standard two-band approach for Co-doped .
- Received 1 November 2013
- Revised 25 June 2014
DOI:https://doi.org/10.1103/PhysRevB.90.014506
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