Figure 3
(a) The raw ab-plane σ 1(ω) of (Sr0.933La0.067)2IrO4 in the energy region below 0.05 eV. In (b), we display the optical conductivity obtained by subtracting the contribution of the external phonon modes from the raw σ 1(ω). The dashed lines represent the extrapolated σ 1(ω) calculated from the Kramers-Kronig analysis of R(ω) with the Hagen-Rubens relation. (c) Frequency-dependent spectral weight SW(ω). (d) SW(17 meV) (solid circles) and SW(100 meV) (open circles) normalized to their corresponding SW’s at 100 K. (e) Temperature dependence of the spectral weight for cutoff Ω = 0.05 eV (solid triangles), 0.5 eV (solid squares), and ω p ~ 1.4 eV (open squares).
