Comparison of Cu Auger electron transitions between the superconductor YBa2Cu3O7-x and the oxides of Cu—O systemReportar como inadecuado




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Abstract : Auger electron spectroscopy A.E.S. has been employed to investigate the valence of copper in superconducting YBa2Cu3O7-x ceramics. Comparison of A.E.S. spectra of YBa2Cu3O7-x with CuO and Cu2O oxides shows a very specific LM45M45 electronic transition for copper in the superconductor. A very clear doublet splitting of the L 3M45M45 transition is observed in YBa2Cu3O7-x. This result can be attributed approximately to the existence of two valency states Cu+ and Cu2+ for copper. Another interpretation could be to consider the existence of a strong splitting in the 3d orbital level of copper.

Keywords : Auger effect barium compounds yttrium compounds high temperature superconductors Cu Auger electron transitions valence electronic transition doublet splitting YBa sub 2 Cu sub 3 O sub 7 x





Autor: R. Berjoan

Fuente: https://hal.archives-ouvertes.fr/



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