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We investigated optical absorption spectra near the fundamental absorption edge of b-FeSi2 singlecrystals by transmission measurements. The phonon structure corresponding to the emission andabsorption component was clearly observed in the low-temperature absorption spectra. Assumingexciton state in the indirect allowed transition, we determined a phonon energy of 0.031±0.004 eV.A value of 0.814 eV was obtained for the exciton transition energy at 4 K

Indirect optical absorption of single crystalline β-FeSi2