Report
Electronic structure of Mott-insulator CaCu3Ti4O12: Photoemission and inverse photoemission study
| العنوان: | Electronic structure of Mott-insulator CaCu3Ti4O12: Photoemission and inverse photoemission study |
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| المؤلفون: | Im, H. J., Iwataki, M., Yamazaki, S., Usui, T., Adachi, S., Tsunekawa, M., Watanabe, T., Takegahara, K., Kimura, S., Matsunami, M., Sato, H., Namatame, H., Taniguchi, M. |
| المصدر: | Solid State Commun. 217, 17 (2015) |
| سنة النشر: | 2015 |
| المجموعة: | Condensed Matter |
| مصطلحات موضوعية: | Condensed Matter - Strongly Correlated Electrons |
| الوصف: | We have performed the photoemission and inverse photoemission experiments to elucidate the origin of Mott insulating states in A-site ordered perovskite CaCu$_3$Ti$_4$O$_{12}$ (CCTO). Experimental results have revealed that Cu 3$d$-O 2$p$ hybridized bands, which are located around the Fermi level in the prediction of the local-density approximation (LDA) band calculations, are actually separated into the upper Hubbard band at $\sim$ 1.5 eV and the lower Hubbard band at $\sim$ $-$1.7 eV with a band gap of $\sim$ 1.5-1.8 eV. We also observed that Cu 3$d$ peak at $\sim$ $-$3.8 eV and Ti 3$d$ peak at $\sim$ 3.8 eV are further away from each other than as indicated in the LDA calculations. In addition, it is found that the multiplet strucutre around $-$9 eV includes a considerable number of O 2$p$ states. These observations indicate that the Cu 3$d$ and Ti 3$d$ electrons hybridized with the O 2$p$ states are strongly correlated, which originates in the Mott-insulating states of CCTO. Comment: 11 pages, 3 figures |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1016/j.ssc.2015.05.007 |
| URL الوصول: | http://arxiv.org/abs/1504.03798 |
| رقم الانضمام: | edsarx.1504.03798 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1016/j.ssc.2015.05.007 |
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