Abstract
The Cu-Lβ/Cu-Lα x-ray emission intensity ratio of the following compounds have been found to show an interesting consistency: Cu, Cu2O, CuO, La1.85Ba.15CuO4 (vacuum annealed), La1.85Ba.15CuO4 (air annealed, TC = 26K), La1.85Sr.15CuO4 (TC = 35K), YBa2Cu3O7-Δ (TC = 91K), ErBa2Cu3O7-Δ (TC = 81K), and La2CuO4. The interesting consistency is that all of the last six compounds, all superconductors or superconductor related, have the same Lβ/Lα intensity ratio, namely, 0.33±0.01. The Cu-Lα,β spectra of CuO, air and vacuum annealed La1.85 Ba.15CuO4 and YBa2Cu3O7-Δ are presented. Also presented are O-K x-ray fluorescence spectra of air and vacuum annealed La1.85 Ba.15CuO4, and of “new” and “old” YBa2Cu3O7-Δwhich seem to show a correspondence between spectral sharpness and high TC behavior.
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