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@INPROCEEDINGS{Wrdenweber:203506,
      author       = {Wördenweber, Roger and Schwarzkopf, J and cai, biya and
                      Dai, Yang and Braun, D and Schubert, Jürgen and Hollmann,
                      Eugen},
      title        = {{T}ailoring the {P}roperties of {F}erroelectric {F}ilms via
                      {C}ompressive and {T}ensile {S}train},
      reportid     = {FZJ-2015-05427},
      year         = {2015},
      abstract     = {The impact of anisotropic biaxial strain on the
                      ferroelectric properties of thin oxide films (20-100nm) are
                      examined using the example of epitaxial NaNbO3 and SrTiO3
                      films that are grown on single-crystalline oxide substrates
                      with different lattice mismatch, leading to compressive and
                      tensile in-plane strain, respectively. Generally, tensile
                      in-plane strain leads to an increase of the ferroelectric
                      in-plane transition temperature whereas compressive strain
                      tends to decrease the transition temperature. Shifts of the
                      transition temperature by several 100K can easily be
                      obtained via this method leading to room-temperature
                      permittivity of several 1000. Our investigations have shown
                      that the phase transition itself and the ferroelectric
                      states of the anisotropically strained films turn out to be
                      highly complex. First, the transition temperature depends on
                      the direction of the applied electric field which
                      contradicts the concept of an uniform phase transition for a
                      given system. Second, all systems, that we examined, showed
                      relaxor properties which are usually expected for systems
                      consisting of a mixture of phases. Third, most ferroelectric
                      properties strongly depend on the applied electric field.
                      This can partially be explained by Rayleigh law, however
                      especially for the tensile strained SrTiO3 terms of higher
                      order in the field dependence of the permittivity indicate
                      the strong impact of pinning of domain walls and polar
                      regions (e.g. polar nano regions). Finally at elevated
                      temperature an anisotropic conductivity is observed. The
                      latter might attributed to domain wall conductance. The
                      different observations are discussed in terms of existing
                      models, potential application of the different properties
                      will be sketched.},
      month         = {Oct},
      date          = {2015-10-07},
      organization  = {Workshop on Oxide Electronics 22,
                       Paris (France), 7 Oct 2015 - 9 Oct
                       2015},
      subtyp        = {After Call},
      cin          = {PGI-8 / JARA-FIT / PGI-9},
      cid          = {I:(DE-Juel1)PGI-8-20110106 / $I:(DE-82)080009_20140620$ /
                      I:(DE-Juel1)PGI-9-20110106},
      pnm          = {523 - Controlling Configuration-Based Phenomena (POF3-523)},
      pid          = {G:(DE-HGF)POF3-523},
      typ          = {PUB:(DE-HGF)6},
      url          = {https://juser.fz-juelich.de/record/203506},
}