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Transmittance and reflectance measurements at terahertz frequencies on a superconducting BaFe1.84Co0.16As2 ultrathin film: an analysis of the optical gaps in the Co-doped BaFe2As2 pnictide

  • Andrea Perucchi
  • Leonetta Baldassarre
  • Boby Joseph
  • Stefano Lupi
  • Sanghan Lee
  • Chang Beom Eom
  • Jianyi Jiang
  • Jeremy D. Weiss
  • Eric E. Hellstrom
  • Paolo DoreEmail author
Regular Article

Abstract

Here we report an optical investigation in the terahertz region of a 40 nm ultrathin BaFe1.84Co0.16As2 superconducting film with superconducting transition temperature T c  = 17.5 K. A detailed analysis of the combined reflectance and transmittance measurements showed that the optical properties of the superconducting system can be described in terms of a two-band, two-gap model. The zero temperature value of the large gap Δ B , which seems to follow a BCS-like behavior, results to be Δ B (0) = 17 cm-1. For the small gap, for which Δ A (0) = 8 cm-1, the temperature dependence cannot be clearly established. These gap values and those reported in the literature for the BaFe2−x Co x As2 system by using infrared spectroscopy, when put together as a function of T c , show a tendency to cluster along two main curves, providing a unified perspective of the measured optical gaps. Below a temperature around 20 K, the gap-sizes as a function of T c seem to have a BCS-like linear behavior, but with different slopes. Above this temperature, both gaps show different supra-linear behaviors.

Keywords

Solid State and Materials 

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Copyright information

© EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  • Andrea Perucchi
    • 1
  • Leonetta Baldassarre
    • 1
  • Boby Joseph
    • 2
  • Stefano Lupi
    • 3
  • Sanghan Lee
    • 4
  • Chang Beom Eom
    • 4
  • Jianyi Jiang
    • 5
  • Jeremy D. Weiss
    • 5
  • Eric E. Hellstrom
    • 5
  • Paolo Dore
    • 6
    Email author
  1. 1.Sincrotrone Trieste, S.C.p.A., Area Science Park, 34012 BasovizzaTriesteItaly
  2. 2.Dipartimento di Fisica, Università di Roma SapienzaRomaItaly
  3. 3.CNR-IOM and Dipartimento di Fisica, Università di Roma SapienzaRomaItaly
  4. 4.Department of Materials Science and EngineeringUniversity of Wisconsin-MadisonMadisonUSA
  5. 5.Applied Superconductivity Center, National High Magnetic Field Laboratory, Florida State UniversityTallahasseeUSA
  6. 6.CNR-SPIN and Dipartimento di Fisica, Università di Roma SapienzaRomaItaly

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