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Pr partial electron donation and Co spin state changes at the metal-insulator transition in (Pr1-yYy)1-xCaxCoO3 as seen by x-ray absorption and emission

AutorHerrero Martín, Javier ; García Muñoz, Josep Lluís ; Frontera Beccaria, Carlos; Barón-González, A. J.; Padilla-Pantoja, J.; Valencia, Sergio; Subías, G.; Blasco, Javier
Fecha de publicación2012
CitaciónICM 2012
ResumenThe electronic and magnetic properties of cobalt-based perovskites are largely determined by the electronic filling of the Co 3d valence band. The characteristic spin state degree of freedom in many cobaltites is correlated to the electron mobility and thus it can play an important role in metal-insulator transitions (MIT). MIT are found in a wide range of compositions of the (Pr1-yYy)1-xCaxCoO3 series, coupled to magnetic and structural changes. At low temperatures, x-ray diffraction confirms a crystal cell volume contraction occurs due to the appearance of a certain quantity of Pr4+ ions. The electrons lost by Pr ions move to Co sites. The expected increase of the average Co-O distance is not observed, may be due to a compensation effect by a likely Co ions spin state change. We present here a comprehensive study of these compounds by means of x-ray absorption and emission spectroscopies, which leads us to confirm these hypothesis also quantifying the intersite charge donation across the MIT. The observed photoinduced phase transition in Pr0.5Ca0.5CoO3 under illumination by laser radiation, where metallic domains can be stimulated, could thus be related to induced spin state changes.
DescripciónResumen del trabajo presentado a la 19th International Conference on Magnetism celebrada en Korea del 8 al 13 de julio de 2012.-- et al.
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