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We have systematically studied the strong correlation effects in A-siteordered perovskites CaCu3Ti4-xRuxO12 (x = 0, 1, 3.5, and 4) by usingphotoemission and inverse photoemission spectroscopies. In x = 0, 1, 3.5, thepeak positions of the strongly correlated Cu 3d states around -3.8 eV and Ti 3dstates around 3.6 eV little change. On the other hand, in x = 4, the Cu 3dstates split into two peaks around -2.5 and -4 eV. These indicate that Ti playsan important role to retain the strong correlation effects. In addition, themultiplet structures of Cu 3d final states from -8 to -14 eV become weak as Ruincreases, indicating the reduction of the localized characters of Cu 3dstates. At the Fermi level, we observe the absence of spectral weight in x = 0,1 and the development of Ru 4d in-gap states in x = 3.5, 4, which give rise tothe metal-insulator transition between x = 1 and x = 3.5.

Variation of strong correlation effects in A-site ordered perovskites CaCu3Ti4-xRuxO12: Photoemission and inverse photoemission studies