Terahertz conductivity measurement of FeSe0.5Te0.5 and Co-doped BaFe2As2 thin films |
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| Authors: | D Nakamura T Akiike H Takahashi F Nabeshima Y Imai A Maeda T Katase H Hiramatsu H Hosono S Komiya I Tsukada |
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| Institution: | 1. Department of Basic Science, the University of Tokyo, 3-8-1 Komaba, Meguro-ku, Tokyo 153-8902, Japan;2. Materials and Structures Laboratory, Tokyo Institute of Technology, Mail-box R3-1, 4259 Nagatsuta-cho, Midori-ku, Yokohama 226-8503, Japan;3. ERATO-SORST, Japan Science and Technology Agency (JST), in Frontier Research Center, Tokyo Institute of Technology, S2-6F East, Mail-box S2-13, 4259 Nagatsuta-cho, Midori-ku, Yokohama 226-8503, Japan;4. Central Research Institute of Electric Power Industry, 2-6-1 Nagasaka, Yokosuka, Kanagawa 240-0196, Japan;5. Transformative Research-Project on Iron Pnictides (TRIP), JST, Japan;6. Frontier Research Center, Tokyo Institute of Technology, S2-6F East, Mail-box S2-13, 4259 Nagatsuta-cho, Midori-ku, Yokohama 226-8503, Japan;1. Superconductivity Research Laboratory/ISTEC, Tokyo, Japan;2. Waseda University, Tokyo, Japan |
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| Abstract: | The terahertz (THz) conductivity of FeSe0.5Te0.5 (‘11’-type) and Co-doped BaFe2As2 (‘122’-type) thin films are investigated. For ‘11’-type, the frequency dependence of the complex conductivity can be understood as that of BCS-type superconductor near the superconducting gap energy, and we estimated the superconducting gap energy to be 0.6 meV. For ‘122’-type, we estimated the superconducting gap energy to be 2.8 meV, which is considered to be the superconducting gap opened at the electron-type Fermi surface near the M point. |
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