Elastically driven anisotropic percolation in electronic phase-separated manganites

摘要: Complex oxide films are highly anisotropic in the way they conduct electricity, which is due to phase separation. However, origin of this metal–insulator coexistence has been unclear. Transport measurements now show that strain, rather than chemical inhomogeneity, mainly responsible. The presence electronic separation complex materials linked many types exotic behaviour, such as colossal magnetoresistance, transition and high-temperature superconductivity1,2,3,4; however, mechanisms drive formation coexisting phases still debated5,6,7,8. Here we report transport a preferential orientation domains driven by long-range elastic coupling between film substrate. We induce electronic-domain along one axis pseudocubic perovskite single-crystal thin-film manganite epitaxially locking it an orthorhombic Simultaneous temperature-dependent resistivity two perpendicular in-plane axes substantial differences temperature extraordinarily high resistivities, indicate percolative conduction channels open more readily axis. These findings suggest much strongly influenced strain local inhomogeneity.