Experimental identification of the optical phonon of CoSi2 in the infrared
A weak but clear optical structure was detected at 329 cm −1 by both reflectance and transmittance measurements in the far infrared on a 430 Å film of CoSi 2 grown on Si(100). This is the first observation of the IR vibrational mode of the cubic structure of CoSi 2 and the result is in very good agr...
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Veröffentlicht in: | Applied surface science 1995-10, Vol.91 (1-4), p.30-33 |
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Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | A weak but clear optical structure was detected at 329 cm −1 by both reflectance and transmittance measurements in the far infrared on a 430 Å film of CoSi 2 grown on Si(100). This is the first observation of the IR vibrational mode of the cubic structure of CoSi 2 and the result is in very good agreement with theoretical calculations. In order to characterize the sample, the reflectance was extended up to 5.2 × 10 4 cm −1 and the refractive index was also directly obtained in a more limited spectral range by spectroscopic ellipsometry. The IR structure was then quantitatively analyzed by means of a fit procedure, obtaining the values of ω 0 = 327 cm −1 for the phonon energy, of γ = 10.5 cm −1 for the damping parameter and of 0.006 electronic charges for the screened effective ionic charge. |
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ISSN: | 0169-4332 1873-5584 1873-5584 |
DOI: | 10.1016/0169-4332(95)00090-9 |