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Title: Single-crystal high entropy perovskite oxide epitaxial films

Examples of single-crystal epitaxial thin films of a high entropy perovskite oxide are synthesized. Pulsed laser deposition is used to grow the configurationally disordered $$AB{\mathrm{O}}_{3}$$ perovskite $$\mathrm{Ba}(\mathrm{Z}{\mathrm{r}}_{0.2}\mathrm{S}{\mathrm{n}}_{0.2}\mathrm{T}{\mathrm{i}}_{0.2}\mathrm{H}{\mathrm{f}}_{0.2}\mathrm{N}{\mathrm{b}}_{0.2}){\mathrm{O}}_{3}$$ epitaxially on $$\mathrm{SrTi}{\mathrm{O}}_{3}$$ and MgO substrates. X-ray diffraction and scanning transmission electron microscopy demonstrate that the films are single phase with excellent crystallinity and atomically abrupt interfaces to the underlying substrates. Atomically resolved electron-energy-loss spectroscopy mapping shows a uniform and random distribution of all $B$-site cations. The ability to stabilize perovskites with this level of configurational disorder offers new possibilities for designing materials from a much broader combinatorial cation pallet while providing a fresh avenue for fundamental studies in strongly correlated quantum materials where local disorder can play a critical role in determining macroscopic properties.
Authors:
 [1] ;  [2] ;  [1] ;  [3] ;  [1] ;  [4] ;  [1] ;  [5] ;  [1] ;  [1] ;  [1] ;  [2] ;  [1]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science and Technology Division
  2. Univ. of Tennessee, Knoxville, TN (United States). Dept. of Material Science and Engineering
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Environmental and Transportation Science Division
  4. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science and Technology Division; Martin Luther Univ. of Halle-Wittenberg, Halle (Germany). Inst. for Physics
  5. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science and Technology Division; Univ. of Tennessee, Knoxville, TN (United States). Dept. of Material Science and Engineering
Publication Date:
Grant/Contract Number:
AC05-00OR22725; GBMF4416
Type:
Published Article
Journal Name:
Physical Review Materials
Additional Journal Information:
Journal Volume: 2; Journal Issue: 6; Journal ID: ISSN 2475-9953
Publisher:
American Physical Society (APS)
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); ORNL Laboratory Directed Research and Development (LDRD) Program; Gordon and Betty Moore Foundation (United States)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; synthesis; thermal conductivity; perovskite; thin films; thermoreflectance; laser ablation
OSTI Identifier:
1457481
Alternate Identifier(s):
OSTI ID: 1460198