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The electronic structure of A-site ordered perovskite CaCu3Ti4O12 (CCTO) was studied by X-ray Raman scattering. Core-excitation of Cu 2p3d and 2p4p were observed under excitation around the Cu K absorption edge, where underlining denotes core holes. The Cu 3d state was resonantly enhanced under excitation just below the absorption edge. The XRS spectra suggested that the Cu-ion in CCTO is divalent...
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