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@ARTICLE{DeSouza:155485,
      author       = {De Souza, R. A. and Gunkel, F. and Hoffmann-Eifert, S. and
                      Dittmann, R.},
      title        = {{F}inite-size versus interface-proximity effects in
                      thin-film epitaxial ${S}r{T}i{O}_3$},
      journal      = {Physical review / B},
      volume       = {89},
      number       = {24},
      issn         = {1098-0121},
      address      = {College Park, Md.},
      publisher    = {APS},
      reportid     = {FZJ-2014-04651},
      pages        = {241401},
      year         = {2014},
      abstract     = {The equilibrium electrical conductivity of epitaxial SrTiO3
                      (STO) thin films was investigated as a function of
                      temperature, 950≤ T/K ≤1100, and oxygen partial
                      pressure, 10−23≤ pO2/bar ≤1. Compared with
                      single-crystal STO, nanoscale thin-film STO exhibited with
                      decreasing film thickness an increasingly enhanced
                      electronic conductivity under highly reducing conditions,
                      with a corresponding decrease in the activation enthalpy of
                      conduction. This implies substantial modification of STO's
                      point-defect thermodynamics for nanoscale film thicknesses.
                      We argue, however, against such a finite-size effect and for
                      an interface-proximity effect. Indeed, assuming trapping of
                      oxygen vacancies at the STO surface and concomitant
                      depletion of oxygen vacancies—and accumulation of
                      electrons—in an equilibrium surface space-charge layer, we
                      are able to predict quantitatively the conductivity as a
                      function of temperature, oxygen partial pressure, and film
                      thickness. Particularly complex behavior is predicted for
                      ultrathin films that are consumed entirely by space charge.},
      cin          = {PGI-7},
      ddc          = {530},
      cid          = {I:(DE-Juel1)PGI-7-20110106},
      pnm          = {424 - Exploratory materials and phenomena (POF2-424)},
      pid          = {G:(DE-HGF)POF2-424},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000336917700001},
      doi          = {10.1103/PhysRevB.89.241401},
      url          = {https://juser.fz-juelich.de/record/155485},
}