skip to main content

SciTech ConnectSciTech Connect

Title: Symmetry and lattice mismatch induced strain accommodation near and away from correlated perovskite interfaces

Distinct MnO{sub 6} octahedral distortions near and away from the La{sub 0.67}Sr{sub 0.33}MnO{sub 3}/SrTiO{sub 3}(001) (LSMO/STO) interface are quantified using synchrotron x-ray diffraction and dynamical x-ray diffraction simulations. Three structural regions of stress accommodation throughout the film thickness were resolved: near the LSMO/STO interface, intermediate region farther from the interface, and the main layer away from the interface. The results show that within the first two unit cells stress is accommodated by the suppression of octahedral rotations in the film, leading to the expansion of the c-axis lattice parameter. Farther from the interface film structure acquires octahedral tilts similar to thicker perovskite films under tensile stress, leading to a reduced c-axis parameter. We demonstrate that these regions are related to two different strain coupling mechanisms: symmetry mismatch at the interface and lattice mismatch in the rest of the film. The findings suggest new routes for strain engineering in correlated perovskite heterostructures.
Authors:
 [1] ;  [2] ;  [3] ; ; ; ; ;  [2]
  1. Geballe Laboratory for Advanced Materials, Stanford University, Stanford, California 94305 (United States)
  2. MESA+ Institute for Nanotechnology, University of Twente, 7500 AE Enschede (Netherlands)
  3. (Germany)
Publication Date:
OSTI Identifier:
22350790
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 105; Journal Issue: 13; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; COUPLING; CRYSTAL DEFECTS; EXPANSION; FILMS; INTERFACES; LANTHANUM COMPOUNDS; LATTICE PARAMETERS; LAYERS; MANGANATES; MANGANESE OXIDES; PEROVSKITE; SIMULATION; STRAINS; STRESSES; STRONTIUM COMPOUNDS; STRONTIUM TITANATES; SYMMETRY; SYNCHROTRON RADIATION; THICKNESS; X-RAY DIFFRACTION