Abstract
The results of infrared reflectivity measurements for the iron-based high-temperature superconductor Ba(Fe0.9Co0.1)2As2 are reported. The reflectivity is found to be close to unity at frequencies ω lower than 2Δ/h (2Δ is the superconducting gap and h is Planck’s constant). This is evidence for the s +/− or s +/+ symmetry of the superconducting order parameter in the studied compound. The infrared reflectivity spectra of Ba(Fe0.9Co0.1)2As2 manifest opening of several superconducting gaps at temperatures lower than critical T c .
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Original Russian Text © Yu.A. Aleshchenko, A.V. Muratov, V.M. Pudalov, E.S. Zhukova, B.P. Gorshunov, F. Kurth, K. Iida, 2011, published in Pis’ma v Zhurnal Eksperimental’noi i Teoreticheskoi Fiziki, 2011, Vol. 94, No. 9, pp. 779–782.
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Aleshchenko, Y.A., Muratov, A.V., Pudalov, V.M. et al. Observation of multiple superconducting gaps in the infrared reflectivity spectra of Ba(Fe0.9Co0.1)2As2 . Jetp Lett. 94, 719–722 (2012). https://doi.org/10.1134/S0021364011210028
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DOI: https://doi.org/10.1134/S0021364011210028