Abstract
We report the complex dielectric function of high-quality Na3Ir3O8 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 t2g bands of a mostly Jeff=1/2 character. The role of the complex hyperkagome lattice structure and strong spin-orbit coupling is considered.
Original language | English (US) |
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Article number | 087401 |
Journal | Physical Review Letters |
Volume | 112 |
Issue number | 8 |
DOIs | |
State | Published - Feb 26 2014 |
All Science Journal Classification (ASJC) codes
- General Physics and Astronomy