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Reflectivity measurements of high quality FeSi single crystal have been performed at 6 and 300 K over a very wide spectral region from 0.05 to 30 eV. The optical conductivity is obtained by a Kramers-Kronig transformation, and it is discussed in connection with the recent band calculation in which the relativistic spin-orbit effects are taken into account and with other measurements done on FeSi before. The result of direct photoconductivity measurement in the spectral region from 200 to 800 cm -1 is also presented.
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Ohta et al. (1994) studied this question.
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