Optical properties of (formula presented) under pressure

K. Takarabe, R. Teranishi, J. Oinuma, Y. Mori, T. Suemasu, S. Chichibu, F. Hasegawa

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We have investigated the high-pressure optical absorption of Iron disilicide, (formula presented) thin films(90 nm in thickness) prepared from Si/Fe multilayers on Si (001) with template and (formula presented) capping. It is found that the experimental absorption coefficient in the range of photon energy of about 0.3 eV beyond the band gap is a few orders of magnitude larger than the first-principles calculated absorption coefficient. A possible explanation for this large absorption coefficient is the saddle-point exciton effect by the calculated band structure. No critical points with negative hydrostatic pressure coefficients such as those of Si and GaAs are observed in (formula presented) near the band gap. The pressure coefficient for the direct band gap of (formula presented) is determined to be 15.9 meV/GPa. This small coefficient is due to the negative deformation potential of the valence-band maximum, and the large bulk modulus of (formula presented).

Original languageEnglish
Pages (from-to)1-5
Number of pages5
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number16
Publication statusPublished - 2002


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