Abstract
Insulating and metallic stripes above and below the Curie temperature, T C, respectively, were observed by a high-resolution scanning tunneling microscopy (STM) and/or spectroscopy (STS) in A-site ordered and macroscopically strain free epitaxial La 0.75Ca 0.25MnO 3 film grown on MgO substrate. The “insulating” stripes were found to be incommensurable to the lattice and aligned along (1 1 0) direction. Metallic stripes were commensurable with periodicity 2 a p∼0.8 nm and aligned parallel to the crystallographic a/ b-axis. Formation of these stripes involves competing charge, orbital, and lattice orders and is an outcome of an overlapping of electron wave functions mediated by the local lattice-strain distribution, existed even in A-site ordered film due to the difference in cation radii of La and Ca.
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