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    題名: The Occurrence of Bulk Superconductivity in the TlBa2CuO5−δ-Type (1021) System
    作者: Ku, H. C.;Shi, J. B.;Ling, D. C.;Hsu, S. W.;Hwang, G. H.;Lin, T. Y.
    貢獻者: 淡江大學物理學系
    關鍵詞: TlBa2CuO5-type (1021) superconductor;metal-insulator transition
    日期: 1989-01-01
    上傳時間: 2013-01-15 18:50:52 (UTC+8)
    出版者: Japan Society of Applied Physics
    摘要: Stable and reproducible superconductivity in the Tl(Ba2−xLax)CuO5−δ (0.0≤x≤0.6) system with the tetragonal TlBa2CuO5−δ-type (1021) structure was reported. A Prototype compound TlBa2CuO5−δ had shown a metastable superconducting onset around 25 K, with zero resistivity at 10 K. With partial substitution of La for Ba ions, Tc (50% resistivity drop) increases to 45 K, Tc0 (zero resistivity) to 42 K and onset around 50 K. A diamagnetic signal was observed with onset as high as 57 K. Tetragonal lattice parameters decrease with the increasing La concentration due to the partial replacement of larger Ba2+ ions by smaller La3+ ions. The Pairing field energy of 170 K and electron-elementary excitation coupling constant λ of 0.76 were derived from the BCS-like Tc formula through comparison with other single Tl–O layer systems TlCan−1Ba2CunO2n+3−δ.
    關聯: Japanese Journal of Applied Physics 28pt2(6), pp.L923-L925
    DOI: 10.1143/JJAP.28.L923
    顯示於類別:[物理學系暨研究所] 期刊論文

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