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We studied the optical absorption, polarized reflectance (PR) and photoluminescence (PL) of β-FeSi 2 single crystals grown from solution. In low-absorption measurements, we found a phonon emission and absorption structure, which suggests an indirect transition. The exciton energy gap of 0.814 eV was determined from the absorption spectrum at 3.5 K. We also found a direct transition with the...
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