Variation of strong correlation effects in A-site ordered perovskites CaCu3Ti4-xRuxO12: Photoemission and inverse photoemission studies
| Autor: | Im, H. J., Iwataki, M., Tsunekawa, M., Watanabe, T., Sato, H., Nakatake, M., Kimura, S. |
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| Rok vydání: | 2020 |
| Předmět: | |
| Zdroj: | J. Phys. Soc. Jpn. 92, 044701 (2023) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.7566/JPSJ.92.044701 |
| Popis: | We have systematically studied the strong correlation effects in A-site ordered perovskites CaCu3Ti4-xRuxO12 (x = 0, 1, 3.5, and 4) by using photoemission and inverse photoemission spectroscopies. In x = 0, 1, 3.5, the peak positions of the strongly correlated Cu 3d states around -3.8 eV and Ti 3d states around 3.6 eV little change. On the other hand, in x = 4, the Cu 3d states split into two peaks around -2.5 and -4 eV. These indicate that Ti plays an important role to retain the strong correlation effects. In addition, the multiplet structures of Cu 3d final states from -8 to -14 eV become weak as Ru increases, indicating the reduction of the localized characters of Cu 3d states. 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 to the metal-insulator transition between x = 1 and x = 3.5. Comment: 12 pages, 3 figures |
| Databáze: | arXiv |
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