| Zusammenfassung |
Temperature dependence of reflectivity and transmission infrared spectra and photoinduced activity of RNiO3 (R = Sm, Pr) were studied in order to elucidate the mechanism responsible for the metal-insulator transition at T-MI approximate to 135 K and approximate to 403 K, respectively. The reflectivity analysis and the agreement found between the small polaron theory and experimental conductivity allowed us to point out the electron-phonon interaction strength and therefore confirm the determinant participation of phonons in the transport properties of RNiO3 (R = Pr, Sm). According to this, the metal-insulator transition at T-MI is directly related to self-trapped electrons in a polaronic medium. [S0163-1829 (99)02628-4]. |
