Atomically-flat,chemically-stable,superconducting epitaxial thin film of iron-based superconductor,cobalt-doped BaFe2As2 |
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| Authors: | Takayoshi Katase Hidenori Hiramatsu Hiroshi Yanagi Toshio Kamiya Masahiro Hirano Hideo Hosono |
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| Affiliation: | 1. Materials and Structures Laboratory, Mailbox R3-1, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama 226-8503, Japan;2. ERATO–SORST, Japan Science and Technology Agency, in Frontier Research Center, Tokyo Institute of Technology, S2-6F East, Mailbox S2-13, 4259 Nagatsuta-cho, Midori-ku, Yokohama 226-8503, Japan;3. Frontier Research Center, S2-6F East, Mailbox S2-13, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama 226-8503, Japan;1. Department of Physics, Universiti Putra Malaysia, 43400, Serdang, Selangor, Malaysia;2. Department of Chemistry, Universiti Putra Malaysia, 43400, Serdang, Selangor, Malaysia;3. Department of Physics, Universiti Kebangsaan Malaysia, 43600, Bangi, Selangor, Malaysia;1. Department of Applied Physics, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan;2. Advanced Science Research Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan;3. Nishina Center, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan;4. Radiation Measurement Research Section, National Institute of Radiological Sciences, 4-9-1 Anagawa, Inage-ku, Chiba 263-8555, Japan;1. Robinson Research Institute, Victoria University of Wellington, PO Box 33436, Lower Hutt 5046, New Zealand;2. MacDiarmid Institute for Advanced Materials and Nanotechnology, Victoria University of Wellington, PO Box 600, Wellington 6140, New Zealand;3. School of Chemical and Physical Sciences, Victoria University of Wellington, PO Box 600, Wellington 6140, New Zealand;4. Division of Materials Science, Faculty of Pure & Applied Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8573, Japan;1. Department of Physics, University of the Western Cape, Private Bag X 17, Bellville 7535, South Africa;2. Highly Correlated Matter Research Group, Department of Physics, University of Johannesburg, PO Box 524, Auckland Park 2006, South Africa;1. Neutron Science Laboratory, Institute of Solid State Physics, University of Tokyo, Tokai, Ibaraki 319-1106, Japan;2. TRIP, JST, Chiyoda, Tokyo 102-0075, Japan;3. Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA |
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| Abstract: | The epitaxial growth of Fe-based superconductors such as Co-doped SrFe2As2 (SrFe2As2:Co) was reported recently, but has still insufficient properties for a device application because they have rough surfaces and are decomposed by reactions with water vapor in an ambient atmosphere. This paper reports that epitaxial films of Co-doped BaFe2As2 grown at 700 °C show the onset superconducting transition temperature of ～20 K. The transition is sharper than those observed on the SrFe2As2:Co films, which would originate from their improved crystallinity. These films also have atomically-flat surfaces with step-and-terrace structures and exhibit chemical stability against exposure to water vapor. |
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