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We have investigated the electronic structure of A-site orderedCaCu$_3$Ti$_4$O$_{12}$ as a function of temperature by using angle-integratedand -resolved photoemission spectroscopies. Intrinsic changes of the electronicstructure have been successfully observed in the valence band region by thecareful consideration of charging effects. The obtained photoemission resultshave revealed that the intensity of the nearly non-dispersive Cu 3$d$-O 2$p$hybridized bands at the binding energy of $\sim$2 eV increases with decreasingtemperature from 300 to 120 K. This suggests that the density of the localizedstates, caused by the strong correlation effects, enhances as temperaturedecreases.

solid state communications

Temperature dependence of the electronic structure of A-site ordered  perovskite CaCu$_3$Ti$_4$O$_{12}$: Angle-integrated and -resolved  photoemission studies