The Occurrence of Bulk Superconductivity in the TlBa2CuO5−δ-Type (1021) System

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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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