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    Please use this identifier to cite or link to this item: http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/24971

    Title: Evidence of the effect of the apical oxygen on the superconductivity of Y1−xCaxBa2Cu3Oy. An O-1s X-ray absorption spectroscopy study
    Authors: Hsieh, C. H.;Chang, C.N.;Lee, S. B.;Kao, H.-C. I.;Chin, C. H.
    Contributors: 淡江大學化學學系
    Keywords: X-ray absorption spectrum;High-Tc superconductor;Y1−xCaxBa2Cu4Oy
    Date: 2003-02
    Issue Date: 2013-07-10 09:34:22 (UTC+8)
    Publisher: Amsterdam: Elsevier BV * North-Holland
    Abstract: Two series of Y1-xCaxBa2Cu3Oy, /x=0.05 and 0.10, have been studied by O-1s X-ray absorption near-edge spectroscopy using synchrotron radiation. The characteristics of the decrease of Tc with the decrease of the oxygen content, y, are found different for the series of /x=0.05 and /x=0.10. The former reveals the importance of the holes on the apical oxygen sites. Through a cross examination between these two series of samples, direct evidences are observed that the reduction of the number of holes on the apical oxygen sites has a negative effect on the superconductivity in the underdoped region of Ca-doped YBCO system.
    Relation: Physica C: Superconductivity and its Applications 384(3), pp.314-320
    DOI: 10.1016/S0921-4534(02)01966-4
    Appears in Collections:[化學學系暨研究所] 期刊論文

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