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Title: La-doped BaTiO{sub 3} heterostructures: Compensating the polarization discontinuity

We demonstrate a route to manipulate the polarization and internal electric field of a complex oxide heterostructure using a layering sequence based on the LaAlO{sub 3}-SrTiO{sub 3} interface. By combining sensitive atomic-level mapping of the structure using direct x-ray phase-retrieval methods with theoretical modeling of the electrostatic charge and polarization, we have devised a novel single-domain polar heterostructure. We find that ionic rearrangement results in strain and free energy minimization, and eliminates the polarization discontinuity leading to a two-fold increase of the spontaneous polarization towards the surface of an ultra-thin single-domain BaTiO{sub 3} film.
Authors:
;  [1] ;  [2] ; ;  [3]
  1. Applied Physics Program, University of Michigan, Ann Arbor, Michigan 48109 (United States)
  2. Racah Institute of Physics, Hebrew University, Jerusalem 91904 (Israel)
  3. Swiss Light Source, Paul Scherrer Institut, CH-5232 Villigen PSI (Switzerland)
Publication Date:
OSTI Identifier:
22269578
Resource Type:
Journal Article
Resource Relation:
Journal Name: APL Materials; Journal Volume: 1; Journal Issue: 6; Other Information: (c) 2013 Author(s); Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ALUMINATES; DOPED MATERIALS; ELECTRIC FIELDS; FILMS; FREE ENERGY; LANTHANUM COMPOUNDS; MINIMIZATION; OXIDES; POLARIZATION; STRONTIUM TITANATES; SURFACES; X RADIATION