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Two-band BCS mechanism of superconductivity in a Ba(Fe0.9Co0.1)2As2 high-temperature superconductor |
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| Authors: | E G Maksimov A E Karakozov A A Voronkov B P Gorshunov S S Zhukov E S Zhukova V S Nozdrin S Haindl B Holzapfel L Schultz D Wu M Dressel K Iida P Kallina F Kurth |
| Institution: | 1. Lebedev Physical Institute, Russian Academy of Sciences, Moscow, 119991, Russia 2. Vereshchagin Institute of High-Pressure Physics, Russian Academy of Sciences, Troitsk, Moscow region, 142190, Russia 3. Prokhorov General Physics Institute, Russian Academy of Sciences, ul. Vavilova 38, Moscow, 119991, Russia 4. Moscow Institute of Physics and Technology (State University), Institutskii per. 9, Dolgoprudnyi, Moscow region, 141700, Russia 5. Volgograd State Technical University, Volgograd, 400131, Russia 6. Institut für Metallishce Werkstoffe, Leibniz-Institut für Festk?rper- und Werkstoffforschung Dresden, P.O. Box 270116, 01171, Dresden, Germany 7. 1. Physikalisches Institut, Universit?t Stuttgart, Pfaffenwaldring 57, 70550, Stuttgart, Germany |
| Abstract: | Terahertz and infrared spectra of the conductivity, σ(ν), and dielectric constant, ?(ν), of a Ba(Fe0.9Co0.1)2As2 film (T c = 20 K) have been analyzed together with previous specific-heat and angular resolved photoelectron spectroscopy data. It has been shown that the spectra σ(ν) and ?(ν) of Ba(Fe0.9Co0.1)2As2 in the superconducting phase at T = 5 K, as well as the magnetic field penetration depth, can be described well using the standard Bardeen-Cooper-Schrieffer (BCS) model with an additive contribution of electron and hole bands. It has been found that the measured temperature dependence of the magnetic field penetration depth in a wide temperature range 5 K < T < T c can be described only with the introduction of interband pairing interaction. The coupling constant of electron and hole bands, λ1, 2 = 0.1, as well as the temperature dependences of superconducting gaps in the electron and hole subsystems, has been determined using the model of two-band superconductivity developed earlier for MgB2. |
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