Fano resonances in the infrared spectra of phonons in hyperkagome Na 3 Ir 3 O 8

D. Pröpper, A. N. Yaresko, T. I. Larkin, T. N. Stanislavchuk, A. A. Sirenko, T. Takayama, A. Matsumoto, H. Takagi, B. Keimer, A. V. Boris

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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 languageEnglish (US)
Article number087401
JournalPhysical Review Letters
Volume112
Issue number8
DOIs
StatePublished - Feb 26 2014

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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