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Title: Lattice distortions and octahedral rotations in epitaxially strained LaNiO{sub 3}/LaAlO{sub 3} superlattices

Using a complementary combination of x-ray diffraction and atomically resolved imaging we investigated the lattice structure of epitaxial LaNiO{sub 3}/LaAlO{sub 3} superlattices grown on a compressive-strain inducing LaSrAlO{sub 4} (001) substrate. A refinement of the structure obtained from the x-ray data revealed the monoclinic I 2/c 1 1 space group. The (Ni/Al)O{sub 6} octahedral rotation angle perpendicular to the superlattice plane is enhanced, and the one parallel to the plane is reduced with respect to the corresponding bulk values. High-angle annular dark field imaging was used to determine the lattice parameters within the superlattice unit cell. High-resolution electron microscopy images of the oxygen atoms are consistent with the x-ray results.
Authors:
;  [1] ; ; ; ; ; ; ; ;  [2] ; ;  [3] ;  [2] ;  [4] ;  [5]
  1. University of Ulm, Central Facility of Electron Microscopy, Albert-Einstein Allee 11, D-89081, Ulm (Germany)
  2. Max Planck Institute for Solid State Research, Heisenbergstr. 1, D-70569 Stuttgart (Germany)
  3. Canadian Centre for Electron Microscopy, McMaster University, 1280 Main Street West, Hamilton, Ontario L8S 4M1 (Canada)
  4. (Germany)
  5. Helmholtz-Zentrum Berlin für Materialien und Energie, Lise-Meitner Campus, Hahn-Meitner-Platz 1, D-14109 Berlin (Germany)
Publication Date:
OSTI Identifier:
22300064
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 104; Journal Issue: 22; 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; ALUMINATES; ATOMS; ELECTRON MICROSCOPY; EPITAXY; LANTHANUM COMPOUNDS; LATTICE PARAMETERS; MONOCLINIC LATTICES; NICKEL COMPOUNDS; OXYGEN COMPOUNDS; RESOLUTION; ROTATION; SPACE GROUPS; STRAINS; SUBSTRATES; SUPERLATTICES; X RADIATION; X-RAY DIFFRACTION