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Title

Electron Localization and Structural Distortions in the Metal-Insulator Transition of Simple Oxides

AuthorsMassa, N. E.; Cruz, Fernando P. de la; Piamontese, Cinthia; Ramos, Aline; Tolentino, Helio C. N.; Salva, H.; Alonso, J. A. ; Martínez-Lope, M. J. ; Casais Álvarez, María Teresa
KeywordsPerovskite oxides
Infrared
EXAFS
Small polarons
Optical conductivity
Issue DateJul-2002
PublisherInternational Institute of Informatics and Systemics
Citation6th World Multiconference on Systemics, Cybernetics and Informatics and 8th International Conference on Information System Analysis and Synthesis (SCI/ISAS 2002) ; 001854
AbstractWe report on electron-phonon interactions as a main common property in simple oxides deduced from infrared measurements, and search, using X-ray absorption techniques, a local structure counterpart associated to it. We found that temperature dependent electron localization is determinant in explaining the conductivity in RNiO3 (R= rare earth) and in La(0.67)Ca(0.33)MnO3 and their metal-insulator phase transitions. This is also associated to a lower symmetry lattice distortion in the insulating phase. The mechanism established from comparison of the experimental conductivity obtained from reflectivity spectra with that from Reik’s theory [1] suggests small polaron hopping as the principle for electron displacement in an oxygen high polarizable lattice. We also comment our preliminary results on the temperature dependent consequence of Jahn- Teller and GdFeO3 lattice distortions in the insulator YVO3.
Description6 pages, 7 figures.-- Communication presented at the 6th World Multiconference on Systemics, Cybernetics and Informatics and 8th International Conference on Information System Analysis and Synthesis (SCI/ISAS 2002, Orlando, Florida, Jul 14-18, 2002).
URIhttp://hdl.handle.net/10261/8905
ISBN980-07-8150-1
Appears in Collections:(ICMM) Comunicaciones congresos
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