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


Ontology type: schema:ScholarlyArticle      Open Access: True


Article Info

DATE

2010-08-06

AUTHORS

A. Perucchi, 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

ABSTRACT

We measured the THz reflectance properties of a high quality epitaxial thin film of the Fe-based superconductor BaFe1.84Co0.16As2 with Tc = 22.5 K. The film was grown by pulsed laser deposition on a DyScO3 substrate with an epitaxial SrTiO3 intermediate layer. The measured RS/RN spectrum, i.e. the reflectivity ratio between the superconducting and normal state reflectance, suggests the presence of a superconducting gap ΔA 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 RS/RN spectrum. The low-energy ΔA gap results to be well determined (ΔA = 15.5±0.5 cm-1), while the value of the high-energy gap ΔB is more uncertain (ΔB = 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/kTc values close to 2 and 7. More... »

PAGES

25-30

References to SciGraph publications

  • 1997-01. Refractive indices of SrTiO3 in the infrared region in JOURNAL OF INFRARED, MILLIMETER, AND TERAHERTZ WAVES
  • 2009-07-26. Electronic correlations in the iron pnictides in NATURE PHYSICS
  • 2010-02-28. Template engineering of Co-doped BaFe2As2 single-crystal thin films in NATURE MATERIALS
  • Identifiers

    URI

    http://scigraph.springernature.com/pub.10.1140/epjb/e2010-00242-y

    DOI

    http://dx.doi.org/10.1140/epjb/e2010-00242-y

    DIMENSIONS

    https://app.dimensions.ai/details/publication/pub.1024466129


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