Abstract
After several years, the Far IR (FIR) results from several laboratories seem to converge. The very FIR transmission data at different temperatures in the normal phase, combined with dc resistivity measurements, lead to a constant plasma frequency in that phase, and a linear variation of collision frequency vc versus temperature T. Approximately the same plasma frequency can be used to explain the FIR transmission spectra at 7 K from 20 to 200 cm−1. These remarks obtained from purely FIR data are in good accordance with the recent conclusions of Fiory et al obtained by a quite different method, i.e. electrostatic measurements.
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