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Metal-insulator phase transitions of SmNiO3 and PrNiO3: Electrons in a polaronic medium
Citation key Mroginski1999a
Author Mroginski, M. A. and Massa, N. E. and Salva, H. and Alonso, J. A. and Martinez-Lope, M. J.
Pages 5304–5311
Year 1999
Journal Physical Review B
Volume 60
Number 8
Abstract 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].
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