Superconductivity dependent on the amount of Bi and Sr in the Bi2Sr2CuO6 compounds

doi:10.1016/j.physc.2007.03.107

淡江大學機構典藏 > 理學院 > 化學學系暨研究所 > 期刊論文 > Item 987654321/25271

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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
顯示於類別:	[物理學系暨研究所] 期刊論文 [化學學系暨研究所] 期刊論文

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