Large spectral weight transfer in optical conductivity of SrTiO$_{3}$ induced by intrinsic vacancies
| Autor: | Asmara, Teguh C., Wang, Xiao, Santoso, Iman, Zhang, Qinfang, Shirakawa, Tomonori, Qi, Dongchen, Kotlov, Aleksei, Motapothula, Mallikarjuna R., Breese, Mark H., Venkatesan, T., Yunoki, Seiji, Rübhausen, Michael, Ariando, Rusydi, Andrivo |
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| Rok vydání: | 2012 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| Popis: | The optical conductivity ($\sigma_{1}$) of SrTiO$_{3}$ for various vacancies has been systematically studied using a combination of ultraviolet - vacuum ultraviolet (UV-VUV) reflectivity and spectroscopic ellipsometry. For cation (Ti) vacancies, $\sigma_{1}$ shows large spectral weight transfer over a wide range of energy from as high as 35 eV to as low as 0.5 eV and the presence of mid-gap states, suggesting that strong correlations play an important role. While for anion (O) vacancies $\sigma_{1}$ shows changes from 7.4 eV up to 35 eV. These unexpected results can be explained in terms of orbital reconstruction. Comment: Main article (5 pages, 3 figures); Supporting Online Material (12 pages, 6 Figures) |
| Databáze: | arXiv |
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