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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

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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.

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Authors and Affiliations

  1. Sincrotrone Trieste, S.C.p.A., Area Science Park, 34012 Basovizza, Trieste, Italy

    Andrea Perucchi & Leonetta Baldassarre

  2. Dipartimento di Fisica, Università di Roma Sapienza, P.le Aldo Moro 2, 00185, Roma, Italy

    Boby Joseph

  3. CNR-IOM and Dipartimento di Fisica, Università di Roma Sapienza, P.le Aldo Moro 2, 00185, Roma, Italy

    Stefano Lupi

  4. Department of Materials Science and Engineering, University of Wisconsin-Madison, Madison, WI, 53706, USA

    Sanghan Lee & Chang Beom Eom

  5. Applied Superconductivity Center, National High Magnetic Field Laboratory, Florida State University, 2031 East Paul Dirac Drive, Tallahassee, FL, 32310, USA

    Jianyi Jiang, Jeremy D. Weiss & Eric E. Hellstrom

  6. CNR-SPIN and Dipartimento di Fisica, Università di Roma Sapienza, P.le Aldo Moro 2, 00185, Roma, Italy

    Paolo Dore

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  1. Andrea Perucchi
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Perucchi, A., Baldassarre, L., Joseph, B. et al. 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. Eur. Phys. J. B 86, 274 (2013). https://doi.org/10.1140/epjb/e2013-30964-y

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