High-temperature superconductivity in the presence of O 2p-Cu 3d holes: A spectroscopic study

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Title:	High-temperature superconductivity in the presence of O 2p-Cu 3d holes: A spectroscopic study
Authors:	Horn, S.;Cai, J.;Shaheen, S. A.;Jeon, Y.;Croft, M.;Chang, C. L.;den Boerand, M. L.
Contributors:	淡江大學物理學系
Date:	1987-09
Issue Date:	2013-07-09 15:05:13 (UTC+8)
Publisher:	College Park: American Physical Society
Abstract:	We report core-level spectroscopic measurements of several cuprate perovskites comparing those which exhibit superconductivity above 90 K to others which do not. Both x-ray photoemission and x-ray absorption results show that in the former Cu is more oxidized, as in CuO (nominally Cu2+), than in the latter. Trivalent Cu is clearly excluded. The O 1s core level is at higher binding energy in the superconductors, implying the presence of O 2p holes. The rare-earth valence in Ce- and Pr-based perovskites is more than 3+, apparently related to their failure to superconduct.
Relation:	Physical Review B (Condensed Matter) 36(7), pp.3895-3898
DOI:	10.1103/PhysRevB.36.3895
Appears in Collections:	[Graduate Institute & Department of Physics] Journal Article

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