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Far-infrared probe of energy gap in LaO1−xFxFeGe compound

We report on the electrical resistivity and far-infrared reflectance measurements of LaO1−xFxFeGe samples. Furthermore, we introduce a new method to probe the energy gap and determine its value. The onset transition temperature was 22.8 K for x = 0.13, and a clear anomaly was observed at 90 K in the ρ(T) curve for x = 0.11 with Tc = 20.6 K. We clearly observed the phonon-suppressed feature in reflectance spectra where F-doping caused a strong suppression of a peak at 200 cm−1. The energy gap above Tc, 2Δ = 2.10 meV, was determined from the measured spectra based on the changes in reflectivity by F-doping.