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Correlation between electronic states of O, Cu, and Ba in several high-Tc superconductors (1988)

Horn, S. ; Cai, J. ; Shaheen, S. A. ; [et al.]

[S.l.] : American Institute of Physics (AIP)

Journal of Applied Physics 63 (1988), S. 4193-4195

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ISSN: 1089-7550

Source: AIP Digital Archive

Topics: Physics

Notes: X-ray photoemission measurements of Y-, Sm-, Eu-, and Yb-based high-temperature superconductors show a clear correlation between Cu 2p satellite features, which previous work has shown are associated with materials which exhibit superconductivity, and a high-binding-energy peak in the O 1s spectrum. In samples with varying oxygen content the intensity of the Cu 2p satellites changes, reflecting the Cu valence which varies between 1+ and 2+. The high-binding-energy O peak appears to track the Cu valence. This high-binding-energy peak may be indicative of the presence of O 2p holes, suggested in some models as necessary for superconductivity. The Ba 3d peak position also changes systematically with the Cu valence.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1063/1.341147

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