Figure 4
From: Revisiting optical properties of MgB2 with a high-quality sample prepared by a HPCVD method
(a) The measured optical scattering rate, 1/τ op(ω) at 8 K (superconducting state), and the optical scattering rate calculated using Allen’s formula17 together with α 2 F(ω) extracted from the 1/τ op(ω) data at 50 K through a maximum entropy (ME) fitting. The grey line is the derivative of the simulated optical scattering rate at 8 K. (b) The optical conductivity data at 8 K and 50 K and simulated values obtained using the extracted α 2 F(ω) through a reverse process32. In the inset, we display a magnified view in order to show the dips of the measured and simulated data near 550 cm−1. (c) The quantity \(-{\omega }^{2}{\epsilon }_{1}(\omega )\) at 8 K and 50 K, and corresponding simulated values. The two magenta arrows mark the positions of the superconducting gaps: 2Δ π and 2Δ σ . The dark blue arrow marks the position, Ω R , of the strong (or major) peak of α 2 F(ω). The two red arrows mark the positions of the characteristic energy scales, Ω R + 2Δ π and Ω R + 2Δ σ .
