Structural and physical properties of ReN i03 (Re=Sm, N d) nanostructured films prepared by Pulsed Laser Deposition

dc.contributor.advisorMaaza, M .
dc.contributor.authorDiop, Ngom, Balla
dc.date.accessioned2021-04-22T11:29:21Z
dc.date.accessioned2024-05-14T13:26:40Z
dc.date.available2021-04-22T11:29:21Z
dc.date.available2024-05-14T13:26:40Z
dc.date.issued2010
dc.descriptionPhilosophiae Doctor - PhDen_US
dc.description.abstractVery few systems allow the study of the relationship between structural changes and physical properties in such a clear way as rare earth nickelate ReNi03 perovskites (Re (rare earth) = Pr, Nd, Sm and Gd). Synthesized for the first time by Demazeau et al [1] in 1971 and completely forgotten for almost twenty years, these compounds have regained interest since the discovery of high-temperature superconductivity and giant magnetoresistive effects in other perovskite-related systems. Due to its Metal-Insulator Transition (MIT) and thermochromic properties, the rare earth nickelate perovskite ReNi03 has received a great deal of attention for the past ten years in their thin films form [12]. Such unusual electronic and optical features are all the more interesting since the metal-insulator transition temperature (TMn) can be tuned by changing the Re cation: LaNi03 is metallic. No minimum of the metallic conductivity of Sm0 . ssNd 0.45Ni03, as observed by Gire et al [12] (entropic effect), was reported by Ambrosini and Hamet [11]. It has been suggested by Obradors et al. [13] that changing the rare earth cation in the ReNi03 system, acts as internal chemical pressure (increasing internal pressure by substituting the rare earth cation with another one of larger ionic radius) which can lead, as for the isostatic pressure experiment, to a tunability of the metal-insulator transition temperature [14, 15]. Obradors et al [13] reported on a decrease of T MIT upon increasing isostatic pressure but with remaining metallic properties of PrNi03 and NdNi03 (same magnitude and thermal dependence of the electrical resistivity)en_US
dc.identifier.urihttps://hdl.handle.net/10566/15016
dc.language.isoenen_US
dc.publisherUniversity of the Western Capeen_US
dc.rights.holderUniversity of the Western Capeen_US
dc.subjectMetal-Insulator Transition (MIT)en_US
dc.subjectPerovskitesen_US
dc.subjectThermochromicen_US
dc.subjectUltra-fasten_US
dc.subjectNickelateen_US
dc.subjectIsostaticen_US
dc.subjectPlumeen_US
dc.subjectTechniquesen_US
dc.titleStructural and physical properties of ReN i03 (Re=Sm, N d) nanostructured films prepared by Pulsed Laser Depositionen_US

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