Two-band BCS mechanism of superconductivity in a Ba(Fe0.9Co0.1)2As2 high-temperature superconductor

Autor:	Boris Gorshunov, A. A. Voronkov, Bernhard Holzapfel, P. Kallina, Kazumasa Iida, Evgenii G. Maksimov, Martin Dressel, Ludwig Schultz, Elena S. Zhukova, S. S. Zhukov, Fritz Kurth, D. Wu, V. S. Nozdrin, S. Haindl, A. E. Karakozov
Rok vydání:	2011
Předmět:	Physics Superconductivity Coupling constant High-temperature superconductivity Physics and Astronomy (miscellaneous) Solid-state physics Condensed matter physics Dielectric Electron Atmospheric temperature range law.invention law Condensed Matter::Superconductivity Penetration depth
Zdroj:	JETP Letters. 93:736-742
ISSN:	1090-6487 0021-3640
Popis:	Terahertz and infrared spectra of the conductivity, σ(ν), and dielectric constant, ɛ(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 ɛ(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.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::4da62dbecb510c3573dbad9b80934c15 https://doi.org/10.1134/s0021364011120095 Zobrazit plný text záznamu Plný text ve formátu PDF