Fano Resonances in the Infrared Spectra of Phonons in Hyper-Kagome Na_3Ir_3O_8

Abstract

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.

6 pages, 3 figures, 1 table

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Cited by in corpus (6)

• Models and Materials for Generalized Kitaev Magnetism
• Giant exciton Fano resonance in quasi-one-dimensional Ta${}_2$NiSe${}_5$
• Two-magnon Raman scattering and pseudospin-lattice interactions in Sr2IrO4 and Sr3Ir2O7
• Possible gapless spin liquid in a rare-earth kagomé lattice magnet Tm${}_3$Sb${}_3$Zn${}_2$O${}_{14}$
• Thermal conductivity across the metal-insulator transition in single crystalline hyperkagome Na${}_{3+x}$Ir${}_3$O${}_8$
• Intrinsic charge dynamics in high-Tc AFeAs(O,F) superconductors