We have investigated the electrodynamic response of single-crystalline FeSi over a frequency range from d.c. to 10 5 cm -1 . At low frequencies, we found evidence for an Anderson-Mott localization behaviour of the low-temperature optical conductivity, while at high frequencies the excitation spectrum resembles that of a conventional semiconductor. The missing spectral weight below the gap energy is redistributed around the gap edge, in disagreement with previous claims based on optical measurements.
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Degiorgi et al. (1994) studied this question.
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