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Title: Anomalously deep polarization in SrTiO3 (001) interfaced with an epitaxial ultrathin manganite film

Using atomically-resolved imaging and spectroscopy, we reveal a remarkably deep polarization in non-ferroelectric SrTiO3 near its interface with an ultrathin nonmetallic film of La2/3Sr1/3MnO3. Electron holography shows an electric field near the interface in SrTiO3, yielding a surprising spontaneous polarization density of ~ 21 μC/cm2. Combining the experimental results with first principles calculations, we propose that the observed deep polarization is induced by the electric field originating from oxygen vacancies that extend beyond a dozen unit-cells from the interface, thus providing important evidence of the role of defects in the emergent interface properties of transition metal oxides.
Authors:
 [1] ;  [2] ; ;  [3] ;  [3] ;  [2] ;  [2] ;  [2] ;  [2] ;  [3] ;  [3] ;  [2]
  1. Louisiana State Univ., Baton Rouge, LA (United States); Brookhaven National Lab. (BNL), Upton, NY (United States)
  2. Brookhaven National Lab. (BNL), Upton, NY (United States)
  3. Louisiana State Univ., Baton Rouge, LA (United States)
Publication Date:
OSTI Identifier:
1341639
Report Number(s):
BNL--113356-2016-JA
Journal ID: ISSN 2469-9950; R&D Project: MA015MACA; KC0201010
Grant/Contract Number:
SC00112704
Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 94; Journal Issue: 15; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Research Org:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY