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@ARTICLE{Park:173018,
      author       = {Park, D. and Herpers, Anja and Menke, Tobias and
                      Heidelmann, Markus and Houben, Lothar and Dittmann, Regina
                      and Mayer, Joachim},
      title        = {{S}tudies of {L}ocal {S}tructural {D}isortions in
                      {S}trained {U}ltrathin {B}a{T}i{O}3 {F}ilms sing {S}canning
                      {T}ransmission {E}lectron {M}icroscopy},
      journal      = {Microscopy and microanalysis},
      volume       = {20},
      issn         = {1431-9276},
      address      = {New York, NY},
      publisher    = {Cambridge University Press},
      reportid     = {FZJ-2014-06431},
      pages        = {740 -747},
      year         = {2014},
      abstract     = {Ultrathin ferroelectric heterostructures
                      (SrTiO3/BaTiO3/BaRuO3/SrRuO3) were studied by scanning
                      transmission electron microscopy (STEM) in terms of
                      structural distortions and atomic displacements. The
                      TiO2-termination at the top interface of the BaTiO3 layer
                      was changed into a BaO-termination by adding an additional
                      BaRuO3 layer. High-angle annular dark-field (HAADF) imaging
                      by aberration-corrected STEM revealed that an artificially
                      introduced BaO-termination can be achieved by this interface
                      engineering. By using fast sequential imaging and
                      frame-by-frame drift correction, the effect of the specimen
                      drift was significantly reduced and the signal-to-noise
                      ratio of the HAADF images was improved. Thus, a quantitative
                      analysis of the HAADF images was feasible, and an in-plane
                      and out-of-plane lattice spacing of the BaTiO3 layer of 3.90
                      and 4.22 Å were determined. A 25 pm shift of the Ti columns
                      from the center of the unit cell of BaTiO3 along the c-axis
                      was observed. By spatially resolved electron energy-loss
                      spectroscopy studies, a reduction of the crystal field
                      splitting (CFS, ΔL3=1.93 eV) and an asymmetric broadening
                      of the e g peak were observed in the BaTiO3 film. These
                      results verify the presence of a ferroelectric polarization
                      in the ultrathin BaTiO3 film.},
      cin          = {PGI-5},
      ddc          = {570},
      cid          = {I:(DE-Juel1)PGI-5-20110106},
      pnm          = {424 - Exploratory materials and phenomena (POF2-424)},
      pid          = {G:(DE-HGF)POF2-424},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000339158700014},
      doi          = {10.1017/S1431927614000518},
      url          = {https://juser.fz-juelich.de/record/173018},
}