Ontology type: schema:ScholarlyArticle Open Access: True
2010-08-06
AUTHORSA. 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
ABSTRACTWe 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... »
PAGES25-30
http://scigraph.springernature.com/pub.10.1140/epjb/e2010-00242-y
DOIhttp://dx.doi.org/10.1140/epjb/e2010-00242-y
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