Lattice distortions and octahedral rotations in epitaxially strained LaNiO3/LaAlO3 superlattices Journal Articles uri icon

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abstract

  • Using a complementary combination of x-ray diffraction and atomically resolved imaging we investigated the lattice structure of epitaxial LaNiO3/LaAlO3 superlattices grown on a compressive-strain inducing LaSrAlO4 (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)O6 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

  • Kinyanjui, MK
  • Lu, Y
  • Gauquelin, N
  • Wu, M
  • Frano, A
  • Wochner, P
  • Reehuis, M
  • Christiani, G
  • Logvenov, G
  • Habermeier, H-U
  • Botton, Gianluigi
  • Kaiser, U
  • Keimer, B
  • Benckiser, E

publication date

  • June 2, 2014