Abstract
We have investigated the electrodynamic response of single-phase RuSi in its low and high temperature phases. While the high-temperature phase (CsCl-type) is a simple metal, the low-temperature phase (FeSi-type) is a semiconductor which shows at room temperature a narrow gap of approximately 0.4 eV, while an even smaller gap of approximately 20 meV appears in the optical spectra below 100 K. Extrinsic-like inclusions, due to deviations from the ideal stoichiometry in the RuSi-matrix, lead to a remaining low frequency spectral weight of metallic nature in the FeSi-type RuSi.
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