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Title: Crystal Symmetry Engineering in Epitaxial Perovskite Superlattices

Journal Article · · Advanced Functional Materials
 [1];  [2];  [3];  [4];  [3];  [3];  [5];  [3];  [6];  [7];  [8];  [9];  [10]; ORCiD logo [4];  [3];  [7];  [2]; ORCiD logo [4];  [1]
  1. Univ. of Electronic Science and Technology of China, Huzhou (China); Univ. of Electronic Science and Technology of China, Chengdu (China)
  2. Beijing Computational Science Research Center (China)
  3. Univ. of Electronic Science and Technology of China, Chengdu (China)
  4. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  5. University of Electronic Science and Technology of China (UESTC)
  6. Shanghai Univ. (China)
  7. Univ. of New South Wales, Sydney (Australia)
  8. Washington Univ., St. Louis, MO (United States)
  9. Univ. of Newcastle, Callaghan (Australia)
  10. Queensland Univ. of Technology, Brisbane (Australia)

Interface plays a critical role in determining the physical properties and device performance of heterostructures. Traditionally, lattice mismatch, resulting from the different lattice constants of the heterostructure, can induce epitaxial strain. Over past decades, strain engineering has been demonstrated as a useful strategy to manipulate the functionalities of the interface. However, mismatch of crystal symmetry at the interface is relatively less studied due to the difficulty of atomically structural characterization, particularly for the epitaxy of low symmetry correlated materials on the high symmetry substrates. Overlooking those phenomena restrict the understanding of the intrinsic properties of the as- determined heterostructure, resulting in some long-standing debates including the origin of magnetic and ferroelectric dead layers. Here, perovskite LaCoO3-SrTiO3 superlattice (SL) is used as a model system to show that the crystal symmetry effect can be isolated by the existing interface strain. Combining the state-of-art diffraction and electron microscopy, it is found that the symmetry mismatch of LaCoO3-SrTiO3 SL can be tuned by manipulating the SrTiO3 layer thickness to artificially control the magnetic properties. Furthermore, the work suggests that crystal symmetry mismatch can also be designed and engineered to act as an effective strategy to generate functional properties of perovskite oxides.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1817380
Journal Information:
Advanced Functional Materials, Journal Name: Advanced Functional Materials Journal Issue: 47 Vol. 31; ISSN 1616-301X
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English

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