Optical anisotropy of the Jeff = 1/2 Mott insulator Sr2IrO4
| Autor: | Pröpper, D., Yaresko, A. N., Höppner, M., Matiks, Y., Mathis, Y. -L., Takayama, T., Matsumoto, A., Takagi, H., Keimer, B., Boris, A. V. |
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| Rok vydání: | 2016 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevB.94.035158 |
| Popis: | We report the complex dielectric function along and perpendicular to the IrO2 planes in the layered perovskite Sr2IrO4 determined by spectroscopic ellipsometry in the spectral range from 12 meV to 6 eV. Thin high quality single crystals were stacked to measure the c-axis optical conductivity. In the phonon response we identified 10 infrared-active modes polarized within the basal plane and only four modes polarized along the c-axis, in full agreement with first-principle lattice dynamics calculations. We also observed a strong optical anisotropy in the near-infrared spectra arising from direct transitions between Ir 5d t2g Jeff = 1/2 and Jeff = 3/2 bands, which transition probability is highly suppressed for light polarized along the c-axis. The spectra are analyzed and discussed in terms of relativistic LSDA+U band structure calculations. Comment: 9 pages, 7 figures |
| Databáze: | arXiv |
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