K-absorption edge region of copper in oxygen and air-annealed highTc(∼91 K) superconducting (SC) samples, YBa2Cu3O7-δ, has been investigated. The spectra exhibit a weak structure at ∼23 eV. To understand its origin, the spectra have been recorded for quenched Ce-substituted and semiconducting Y2BaCuO5 samples. It is argued that the weak structure (∼23 eV) is not a characteristic feature of an SC compound but appears to be a final state effect.
Volume 94, 2020
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