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A novel method of absorption measurements is reported through which we have succeeded in measuring directly the absolute absorptivity of a La-based superconductor in the 100 GHz to 500 THz frequency region using different lasers. We have made transmission measurements on free standing single crystals of the La-based superconductor using a laser and a high sensitivity detector, and succeeded in measuring the transmissivity. For the first time, the surface impedance has been analytically derived from the absorptivity and transmissivity at room temperature.
Date of Publication: June 1997