| Autor: |
Yu, Wenlei, Han, Meijie, Jiang, Kai, Duan, Zhihua, Li, Yawei, Hu, Zhigao, Chu, Junhao |
| Zdroj: |
Journal of Raman Spectroscopy; Jan2013, Vol. 44 Issue 1, p142-146, 5p |
| Abstrakt: |
Anomalous low temperature behaviors in cuprous oxide (Cu2O) film grown on quartz substrate have been investigated by temperature-dependent Raman and transmittance spectra. The longitudinal optical components of two Γ15- phonon modes become sharper and more intense at a low temperature. It can be found that the highest-order electronic transition located at 6.4 eV exhibits a minimum transmittance near 200 K. Correspondingly, the variations from phonon intensity ratios reveal obvious anomalies with the decreasing temperature, indicating the existence of strong electron-phonon coupling mediated by Fröhlich interaction in the Cu2O films below the temperature of 200 K. Copyright © 2012 John Wiley & Sons, Ltd. [ABSTRACT FROM AUTHOR] |
| Databáze: |
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