Temperature dependence of the electronic structure of A-site ordered perovskite CaCu3Ti4O12: Angle-integrated and -resolved photoemission studies
Abstract
We have investigated the electronic structure of A-site ordered CaCu3Ti4O12 as a function of temperature by using angle-integrated and -resolved photoemission spectroscopies. Intrinsic changes of the electronic structure have been successfully observed in the valence band region by the careful consideration of charging effects. The obtained photoemission results have revealed that the intensity of the nearly non-dispersive Cu 3d-O 2p hybridized bands at the binding energy of ∼2 eV increases with decreasing temperature from 300 to 120 K. This suggests that the density of the localized states, caused by the strong correlation effects, enhances as the temperature decreases.
- Publication:
-
Solid State Communications
- Pub Date:
- August 2019
- DOI:
- 10.1016/j.ssc.2019.113648
- arXiv:
- arXiv:1903.09779
- Bibcode:
- 2019SSCom.29813648I
- Keywords:
-
- A. CaCu<SUB>3</SUB>Ti<SUB>4</SUB>O<SUB>12</SUB>;
- C. Electronic structure;
- D. Strong correlation effects;
- E. Photoemission spectroscopy;
- Condensed Matter - Strongly Correlated Electrons
- E-Print:
- 13 pages, 3 figures