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Effect of intervening structure between CuO2 sheets in heavily Fe-substituted high-Tc superconductor FeSr2YCu2O6+δ |
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| Authors: | T. Mochiku Y. Hata T. Wuernisha Y. Matsushita Y. Katsuya S. Ishimaru M. Tanaka K. Kobayashi A. Hoshikawa T. Ishigaki H. Yasuoka K. Hirata |
| Affiliation: | 1. Superconducting Materials Center, National Institute for Materials Science, 1-2-1, Sengen, Tsukuba, Ibaraki 305-0047, Japan;2. Quantum Beam Center, National Institute for Materials Science, 1-2-1, Sengen, Tsukuba, Ibaraki 305-0047, Japan;3. Department of Applied Physics, National Defense Academy, 1-10-20, Hashirimizu, Yokosuka, Kanagawa 239-8686, Japan;4. Frontier Research Center for Applied Nuclear Sciences, Ibaraki University, 4-12-1, Nakanarusawa, Hitachi, Ibaraki 316-8511, Japan;5. Beamline Station, National Institute for Materials Science, 1-1, Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5198, Japan;6. SPring-8 Service Co. Ltd., 2-23-1, Kouto, Sayo-cho, Sayo-gun, Hyogo 678-2501, Japan |
| Abstract: | Heavily Fe-substituted Ba2YCu3O6+δ-type compound FeSr2YCu2O6+δ exhibits superconductivity around 60 K, only when it is annealed in N2 and subsequently in O2. Cationic distribution in this compound is strongly dependent on ionic radius at the Y site, and its superconducting properties are affected by the cationic distribution. In contrast, although the compound with the substitution of fluorite-type unit for Y has cationic order, it does not exhibit superconductivity. We have analyzed the crystal structure of the compounds with the substitution of other lanthanoid elements for Y and with substitution of fluorite-type unit for Y. |
| Keywords: | FeSr2YCu2O6+δ Cationic order Fluorite |
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