Structural, chemical, and electronic state on La[subscript 0.7]Sr[subscript 0.3]MnO[subscript 3] dense thin-film surfaces at high temperature - Surface segregation
Author(s)Jalili, Helia; Chen, Yan; Yildez, Bilge
Structural, chemical, and electronic state on La0.7Sr 0.3MnO3 dense thin-film surfaces at high temperature - Surface segregation
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The evolution of the surface topographic and electronic structure and chemical state of the La0.7Sr0.3MnO3 (LSMO) thin films were probed using Scanning Tunneling microscopy and X-ray photoelectron spectroscopy to identify the structural nature of surface segregation of Sr on LSMO. The films had a layer-by-layer structure with a step height of 3.9 Å, close to the lattice parameter of LSMO. Up to 500oC in oxygen, the topography and the step heights remained the same, statistically within 2-4%, implying that no phase separation took place on the top layers. The low oxygen pressures, down to 10E-10 mbar at 500-580oC promoted segregation of Sr by 12-20% on the A-site. Our results suggests two possible structures for Sr segregation; the replacement of La by Sr on the AO-surface of the LSMO which retains a perovskite termination, or a separate AO-oxide phase nucleating on the defected lower layers.
DepartmentMassachusetts Institute of Technology. Department of Nuclear Science and Engineering
Jalili, Helia, Yan Chen, and Bilge Yildiz. “Structural, Chemical, and Electronic State on La0.7Sr0.3MnO3 Dense Thin-Film Surfaces at High Temperature: Surface Segregation.” ECS Transactions, 28 (11) 235-240 (2010) ©2010 ECS - The Electrochemical Society.
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