Elimination of Large Scale Electron Phase Separation in Full Chemically Ordered Manganites

Chemical doping in strong correlated oxide system leads to novel properties such as superconductivity，multiferroics , colossal magnetoresistance. Theoretically, cation disorder, inevitably introduced by chemical doping, is believed to play an important role in some cases, such as the large length-scale electronic phase separation (EPS) in manganites. However, the real influence of the chemical doping induced disorder on physical properties of correlated oxides remains unclear experimentally. In this work, using layer-by-layer superlattice growth technique, we fabricate full chemically ordered manganites. The physical properties of the chemically ordered manganites are dramatically different from the their conventional, randomly doped counterpart. The electronic phase separation phenomena has also been observed to disappear in the ordered systems.