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    題名: Superconductivity dependent on the amount of Bi and Sr in the Bi2Sr2CuO6 compounds
    作者: Wu, C. H.;Chu, Y. C.;Ling, D. C.;Liu, S. H.;Pong, W. F.;Hseu, H. S.;Chen, J. M.;Lee, J. F.;Kao, H.-C. I.
    貢獻者: 淡江大學化學學系;淡江大學物理學系
    關鍵詞: Superconductivity;Bi2+xSr2CuOy;Bi2Sr2−xCuOy;Hole concentration;O-K edge XANES;Bi-L edge XANES
    日期: 2007-09
    上傳時間: 2013-07-09 15:25:46 (UTC+8)
    出版者: Amsterdam: Elsevier BV * North-Holland
    摘要: Two series of samples with nominal compositions of Bi2+xSr2CuOy and Bi2Sr2−xCuOy (0 ⩽ x ⩽ 0.10) were prepared by a conventional solid-state reaction method. Laminar morphology is observed for all the samples under SEM. EDS analysis shows that Bi is slightly volatile, the depletion amount is about 3% in the Bi rich samples, but only about 1% loses in the Sr deficient samples. Hole concentration of the Bi2Sr2−xCuOy series increases with increasing x, showing a hole doping effect caused by the depletion of the Sr ions. In contrary, Bi2+xSr2CuOy series has a hole filling effect by introducing the extra Bi ions. These samples show metallic conducting behavior in the normal state and superconducting property at lower temperature. Tc decreases with increasing x on both series. Bi2Sr2CuOy has the highest Tc at 7.9 K with an optimal hole concentration of 0.237. Hole concentrations obtained from the O-K edge XANES spectra and the iodometric titration agree well in these samples.
    關聯: Physica C: Superconductivity and its Applications 460-462 I, pp.422-423
    DOI: 10.1016/j.physc.2007.03.107
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