CENTRO DE QUIMICA INORGANICA "DR. PEDRO J. AYMONINO"
Unidad Ejecutora - UE
congresos y reuniones científicas
The Role of Inhomogeneities in the Electron Dynamics of Transition Metal Oxides (as deduced by Infrared Spectroscopy)
NESTOR E. MASSA
Conditions Extrêmes et Matériaux Haute Température et Irradiation CNRS-CEMHTI , Orléans, Francia
Conferencia; seminario; 2009
Conditions Extrêmes et Matériaux Haute Température et Irradiation CNRS-CEMHTI
One of the current issues at the basis of the understanding of novel materials is the degree of the role played by spatial inhomogeneities in their intrinsic properties. Transition metal oxides from manganites to high Tc superconductors present a plethora of properties that might relate to the presence several competing states due to subtle phase separations. Here we will use our results from infrared spectra of plain glass networks, made of different metal fractions of transition metal nanograins embedded in SiO2, to generalize the understanding of conducting oxide properties by showing that features as vibrational modes carrier screened, hopping electrons, strong electronphonon interactions, localization, or more complex results as giant magnetoresistance and extraordinary Hall effect, may be enhanced by inhomogeneity fingerprints.