Figure 1: Crystal structure of β- and γ-Li2IrO3 and their Raman responses χ′′(ω) in two different scattering channels. | Nature Communications

Figure 1: Crystal structure of β- and γ-Li2IrO3 and their Raman responses χ′′(ω) in two different scattering channels.

From: Raman spectroscopic signature of fractionalized excitations in the harmonic-honeycomb iridates β- and γ-Li2IrO3

Figure 1

(a) Hyperhoneycomb lattice in β- and γ-Li2IrO3. Purple, red and grey balls are iridium, oxygen and lithium atoms, respectively. In β-Li2IrO3, the alternating blue and orange sticks depict the twisted zigzag chains and the green sticks are the bond connecting the zigzag chains. In γ-Li2IrO3, two iridium hexagons are arranged in an alternating way along the c axis. (b,c) Polarization dependence of the Raman response χ′′(ω) of β- and γ-Li2IrO3 in (ac) and (ab) scattering channels measured at T=6 K. A magnetic continuum in (ab) polarization is painted with green shading. An additional magnetic excitation seen in (ac) polarization is highlighted with incarnadine shading. (d) Comparison of the Raman responses χ′′(ω) between β- and γ-Li2IrO3 in the (ac) scattering channel after subtracting phonon peaks. The arrows mark the local maximum of the spectral weight and the Δ symbol indicates an energy gap.

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