Abstract
O K-edge and Cu L 23-edge X-ray-absorption spectra for the series of (Nd 1.05− x Pr x )Ba 1.95Cu 3O 7 compounds with x=0.0–0.5 were measured to investigate how the variation of hole states related to the superconductivity. Near the O 1s edge, the prepeaks at ∼527.6 and ∼528.3 eV are ascribed to transitions into O 2p hole states within the CuO 3 ribbons and the CuO 2 planes, respectively. As deduced from O 1s X-ray absorption spectra, the O 2p hole concentrations in the CuO 2 planes and the CuO 3 ribbons decrease monotonically with increasing the Pr doping. The present results clearly demonstrate that the suppression of superconductivity upon substituting Pr into the (Nd 1.05− x Pr x )Ba 1.95Cu 3O 7 system results predominantly from the hole depletion effect.
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