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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 Delta(B), which seems to follow a BCS-like behavior, results to be Delta(B)(0) = 17 cm(-1). For the small gap, for which Delta(A)(0) = 8 cm(-1), the temperature dependence cannot be clearly established. These gap values and those reported in the literature for the BaFe2-xCoxAs2 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.

@article{ ISI:000321446200034, Author = {Perucchi, Andrea and Baldassarre, Leonetta and Joseph, Boby and Lupi, Stefano and Lee, Sanghan and Eom, Chang Beom and Jiang, Jianyi and Weiss, Jeremy D. and Hellstrom, Eric E. and Dore, Paolo}, Title = {{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}}, Journal = {{EUROPEAN PHYSICAL JOURNAL B}}, Year = {{2013}}, Volume = {{86}}, Number = {{6}}, Month = {{JUN}}, 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 Delta(B), which seems to follow a BCS-like behavior, results to be Delta(B)(0) = 17 cm(-1). For the small gap, for which Delta(A)(0) = 8 cm(-1), the temperature dependence cannot be clearly established. These gap values and those reported in the literature for the BaFe2-xCoxAs2 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.}}, DOI = {{10.1140/epjb/e2013-30964-y}}, Article-Number = {{274}}, ISSN = {{1434-6028}}, EISSN = {{1434-6036}}, ResearcherID-Numbers = {{Baldassarre, Leonetta/H-4637-2013 Joseph, Boby/A-4797-2009 Eom, Chang-Beom/I-5567-2014 Jiang, Jianyi/F-2549-2017 Lee, Sanghan/C-8876-2012 }}, ORCID-Numbers = {{Baldassarre, Leonetta/0000-0003-2217-0564 Joseph, Boby/0000-0002-3334-7540 Jiang, Jianyi/0000-0002-1094-2013 Lee, Sanghan/0000-0002-5807-864X DORE, Paolo/0000-0001-8409-9076}}, Unique-ID = {{ISI:000321446200034}}, }

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