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TT: Fachverband Tiefe Temperaturen

TT 53: Superconductivity: Fe-based Superconductors - 122

TT 53.12: Talk

Wednesday, April 2, 2014, 12:30–12:45, HSZ 201

Tracing the s± symmetry in iron pnictides — •Micha Schilling1, Sina Zapf1, Boris Gorshunov1,2,3, Andreas Baumgartner1, Kazumasa Iida4, Valery A. Dravin5, Kirill V. Mitsen5, Dimitri Efremov6, Oleg Dolgov7, and Martin Dressel111. Physikalisches Institut, Universität Stuttgart, Germany — 2Institute of General Physics, RAS, Russia — 3Moscow Institute of Physics and Technology, Russia — 4Institut für Metallische Werkstoffe, IFW Dresden, Germany — 5Lebedev Physical Institute, Moscow, 119991 Russia — 6Institute for theoretical physics, IFW, Dresden — 7Max-Planck Institut für Festkörperforschung, Stuttgart, Germany

For multiband iron pnictides, the symmetry of the superconducting order parameter is still under debate. It was suggested [1] that in the case of s± symmetry, a disorder-induced crossover from s± to s++ symmetry could occur, meaning that the smaller superconducting gap Δ1 first closes and then reopens. To that end, we have step-wise irradiated a Ba(Fe0.9Co0.1)2As2 thin film with protons and measured its complex conductivity in the terahertz frequency range. Our preliminary results show that the irradiation with protons is capable to linearly decrease the critical temperature of the film, while Δ1 gets suppressed faster. Thus, further irradiation might reveal the reopening of Δ1 and thus proof the s± symmetry of the superconducting order parameter.
D.V. Efremov et al., Phys. Rev. B 84, 180512 (2011)
B. Gorshunov et al., Phys. Rev. B 81, 060509 (2010)

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