Abstract
The reflectivity of superconducting MgB 2 (T c = 39 K) has been measured on a randomly oriented thin film at room temperature over a wide-range of frequencies, 20 ≤ ω < 100000 cm -1 . The conductivity shows highly metallic behavior but cannot be explained with a simple Drude model alone. The electronic contribution is analyzed by a generalized Drude model. The scattering rate 1/τ (ω) and the mass renormalization ratio m * (ω)/m = 1 +λ(ω) exhibit clear frequency dependence. The electron-phonon coupling strength is estimated to be λ ∼ 1.5 ± 0.5 while the plasma frequency ω p is 2.4 eV.
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