Structure/microstructure versus properties in strongly correlated electronic oxides: “Quenched disorder” and non-CMR oxides

Questions about the structure/microstructure versus properties relationships in strongly correlated electronic oxides will be illustrated by two examples. First the Mn/Ni ordering in the La2NiMnO6 compounds prepared in the form of thin films and secondly the La/Ba ordering on bulk 112-type cobalt oxides LaBaCo2O6 will be discussed in relation with their magnetic and electric properties. Using transmission electron microscopy as a main tool, several questions are addressed regarding the need but also the difficulty to establish the structure, microstructure and nanostructure at all relevant temperature as a prerequisite for further analysis of the physical properties in these compounds.