Far-infrared transmission studies of c-axis oriented superconducting MgB2 thin film
Abstract
We reported far-infrared transmission measurements on a c-axis oriented superconducting MgB2 thin film in the frequency range of 30 250 cm-1. We found that these measurements were sensitive to values of scattering rate 1/τ and superconducting gap 2. By fitting the experimental transmission spectra at 40 K and below, we obtained 1/τ = (700 1000) cm-1 and 2 (0) 42 cm-1. These two quantities suggested that MgB2 belong to the dirty limit.
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