Fano Resonances in the Infrared Spectra of Phonons in Hyper-Kagome Na_3Ir_3O_8
| Autor: | Pröpper, D., Yaresko, A. N., Larkin, T. I., Stanislavchuk, T. N., Sirenko, A. A., Takayama, T., Matsumoto, A., Takagi, H., Keimer, B., Boris, A. V. |
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| Rok vydání: | 2013 |
| Předmět: | |
| Zdroj: | Phys. Rev. Lett. 112, 087401 (2014) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevLett.112.087401 |
| Popis: | We report the complex dielectric function of high-quality Na_3Ir_3O_8 single crystals determined by spectroscopic ellipsometry in the spectral range from 15 meV to 2 eV. The far-infrared phonon spectra exhibit highly asymmetric line shapes characteristic of Fano resonances. With decreasing temperature, we observe a sharp increase of the infrared intensity of the Fano-shaped phonon modes accompanied by concomitant changes in the low energy electronic background, formed by electronic transitions between Ir 5d t_2g bands of a mostly J_eff = 1/2 character. The role of the complex Hyper-Kagome lattice structure and strong spin-orbit coupling is considered. Comment: 6 pages, 3 figures, 1 table |
| Databáze: | arXiv |
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