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• W2000267482 abstract "The copper L2,3 soft x-ray absorption spectra of the single phase high temperature (Tc=91 K) superconductor YBa2Cu3O≈7 have been measured by using synchrotron radiation at LURE. The spectra show at the absorption threshold a white line at 931.1 eV due to Cu 2p3d10 final states (the underline indicates the hole) for the Cu 3d9 initial state, and a broad high energy shoulder with the maximum at 933 eV assigned to Cu 2p3d10L and to Cu 2p3d10L 4s1 final states (L indicates a hole in the oxygen 2p derived valence band), i.e. to the initial states 3d9L. The intensity of this last feature has been found to decrease with decreasing oxygen content x in YBa2Cu3O6.5+x. No evidence of Cu 2p3d9 final states has been found. This experiment gives direct evidence that additional oxygen x does not give Cu3+ ions with Cu 3d8 configuration but gives 3d9L electronic configuration (i.e. Cu2+O- pairs) and no gap is observed between the 3d9 (Cu+) and 3d10L configuration (i.e. Cu+O- pairs). Therefore in the metallic phase which exhibits superconductivity a continous set of itinerant states 3d9L and 3d10L is observed." @default.
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• W2000267482 date "1987-09-01" @default.
• W2000267482 modified "2023-09-25" @default.
• W2000267482 title "L2,3 xanes of the high Tc superconductor YBa2Cu3O≈7 with variable oxygen content" @default.
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• W2000267482 doi "https://doi.org/10.1016/0038-1098(87)90650-8" @default.
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