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The European Physical Journal B

, Volume 77, Issue 1, pp 25–30 | Cite as

Multi-gap superconductivity in a BaFe1.84Co0.16As2 film from optical measurements at terahertz frequencies

  • A. PerucchiEmail author
  • L. Baldassarre
  • S. Lupi
  • J. Y. Jiang
  • J. D. Weiss
  • E. E. Hellstrom
  • S. Lee
  • C. W. Bark
  • C. B. Eom
  • M. Putti
  • I. Pallecchi
  • C. Marini
  • P. Dore
Solid State and Materials

Abstract

We measured the THz reflectance properties of a high quality epitaxial thin film of the Fe-based superconductor BaFe1.84Co0.16As2 with T c = 22.5 K. The film was grown by pulsed laser deposition on a DyScO3 substrate with an epitaxial SrTiO3 intermediate layer. The measured R S /R N spectrum, i.e. the reflectivity ratio between the superconducting and normal state reflectance, suggests the presence of a superconducting gap Δ A close to 15 cm-1. A detailed data analysis shows that a two-band, two-gap model is necessary to obtain a good description of the measured R S /R N spectrum. The low-energy Δ A gap results to be well determined (Δ A = 15.5±0.5 cm-1), while the value of the high-energy gap Δ B is more uncertain (Δ B = 55±7 cm-1). Our results provide evidence of two electronic contributions to the system conductivity with the presence of two optical gaps corresponding to 2Δ/kT c values close to 2 and 7.

Keywords

BaFe Drude Parameter Parallel Conductivity Model Multigap Superconductor 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg 2010

Authors and Affiliations

  • A. Perucchi
    • 1
    Email author
  • L. Baldassarre
    • 1
  • S. Lupi
    • 2
  • J. Y. Jiang
    • 3
  • J. D. Weiss
    • 3
  • E. E. Hellstrom
    • 3
  • S. Lee
    • 4
  • C. W. Bark
    • 4
  • C. B. Eom
    • 4
  • M. Putti
    • 5
  • I. Pallecchi
    • 5
  • C. Marini
    • 6
  • P. Dore
    • 6
  1. 1.Sincrotrone Trieste S.C.p.A., S.S. 14 km 163.5, in Area Science ParkBasovizza (Trieste)Italy
  2. 2.CNR-IOM and Dipartimento di FisicaUniversitá di Roma SapienzaRomeItaly
  3. 3.Applied Superconductivity Center, National High Magnetic Field Laboratory, Florida State UniversityTallahasseeUSA
  4. 4.Department of Materials Science and EngineeringUniversity of Wisconsin-MadisonMadisonUSA
  5. 5.CNR-SPIN and Dipartimento di FisicaUniversitá di GenovaGenovaItaly
  6. 6.CNR-SPIN and Dipartimento di FisicaUniversitá di Roma “La Sapienza’RomeItaly

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