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Abstract
O K-edge X-ray absorption near-edge structure (XANES) spectroscopy of (R 0.8Pr 0.2)Ba 2Cu 3O 7 (R=Y, Tm, Dy, Gd, Eu and Sm) has been performed to investigate the dependence of hole distribution on ionic size of the R 3+ ions. Near the O 1s absorption edge, pre-peaks at ∼527.8 and ∼528.5 eV are assigned to transitions into O 2p hole states located in the CuO 3 ribbons and CuO 2 planes, respectively. As deduced from O K-edge X-ray absorption spectra, the hole concentrations in the CuO 2 planes decrease monotonically with increasing ionic size of the rare-earth elements. The present XANES results clearly demonstrate that the suppression of superconductivity in (R 1− x Pr x )Ba 2Cu 3O 7 with ionic radius of the R 3+ ions results predominantly from the hole-depletion effect.
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