Abstract
Temperature dependence of reflectivity and transmission infrared spectra and photoinduced activity of $R{\mathrm{NiO}}_{3}$ $(R=\mathrm{Sm},$ Pr) were studied in order to elucidate the mechanism responsible for the metal-insulator transition at ${T}_{\mathrm{MI}}\ensuremath{\approx}135\mathrm{K}$ and \ensuremath{\approx}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 $R{\mathrm{NiO}}_{3}$ $(R=\mathrm{Pr},$ Sm). According to this, the metal-insulator transition at ${T}_{\mathrm{MI}}$ is directly related to self-trapped electrons in a polaronic medium.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
