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Superconducting gap in iron pnictides studied by optical spectroscopy |
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| Authors: | M. Nakajima S. Ishida T. Liang K. Kihou Y. Tomioka T. Ito C.H. Lee H. Kito A. Iyo H. Eisaki K.M. Kojima T. Kakeshita S. Uchida |
| Affiliation: | a Department of Physics, University of Tokyo, Tokyo 113-0033, Japan b National Institute of Advanced Industrial Science and Technology, Tsukuba 305-8568, Japan c JST, Transformative Research-Project on Iron Pnictides, Tokyo 102-0075, Japan |
| Abstract: | We investigated the in-plane optical spectrum of a Co-doped Ba(Fe0.94Co0.06)2As2 single crystal showing superconductivity below  . In the normal state, the low-energy optical conductivity spectrum can be decomposed into a sharp Drude term and a broad “incoherent” term. Below Tc, an s-wave-like superconducting gap appears in both components. We also investigated a magnetic or spin-density-wave gap in the detwinned parent compound. |
| Keywords: | A. Superconductors C. Infrared spectroscopy D. Optical properties D. Superconductivity |
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