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@INPROCEEDINGS{Wrdenweber:173312,
      author       = {Wördenweber, Roger and Schwarzkopf, J. and cai, biya and
                      Dai, Yang and Braun, D. and Schubert, Jürgen and Hollmann,
                      Eugen},
      title        = {{I}mpact of {C}ompressional and {T}ensile
                      {B}iaxially-{A}nisotropic {S}train on the {F}erroelectric
                      {P}roperties of {E}pitaxial {N}a{N}b{O}3 and {S}r{T}i{O}3
                      {F}ilms},
      reportid     = {FZJ-2014-06723},
      year         = {2014},
      abstract     = {Impact of Compressional and Tensile Biaxially-Anisotropic
                      Strain on the Ferroelectric Properties of Epitaxial NaNbO3
                      and SrTiO3 Films R. Wördenweber1, J. Schwarzkopf2, Biya
                      Cai1, Yang Dai1, D. Braun2, J. Schubert1, E. Hollmann11Peter
                      Grünberg Institute (PGI) and JARA-Fundamentals of Future
                      Information Technology, Forschungszentrum Jülich, D-52425
                      Jülich, Germany2Leibniz-Institute for Crystal Growth,
                      Max-Born-Str. 2, D-12489 Berlin, GermanyThe impact of
                      anisotropic biaxial strain on the ferroelectric properties
                      of thin oxide films (20-100nm) are examined for the example
                      of epitaxial NaNbO3 and SrTiO3 films that are grown on
                      different single-crystalline oxide substrates with varying
                      lattice mismatch. Generally, tensile in-plane strain leads
                      to an increase of the ferroelectric in-plane transition
                      temperature whereas compressive strain tents to decrease the
                      transition temperature. Shifts of the transition temperature
                      by several 100K can easily be obtained via this method. 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 a 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, ferro- to antiferroelectric transitions are observed.
                      These transitions seem to be connected to the presence of
                      polar nanoregions. Finally, all systems show a distinct
                      frequency dependence of the complex permittivity at low
                      frequencies (typically <1kHz) and intermediate temperatures
                      around room temperature. Again this behavior seems to be
                      connected to the presence of polar nanoregions and points to
                      an additional Maxwell-Wagner like mechanism that seems to be
                      present in the temperature regime where the polar
                      nanoregions are present and mobile.},
      month         = {May},
      date          = {2014-05-12},
      organization  = {23rd IEEE International Symposium on
                       Applications of Ferroelectrics (ISAF)
                       International Workshop on Acoustic
                       Transduction Materials and Devices
                       (IWATMD) Piezoresponse Force Microscopy
                       Workshop (PFM), State College (USA), 12
                       May 2014 - 16 May 2014},
      subtyp        = {After Call},
      cin          = {PGI-8 / ICS-8 / PGI-9 / JARA-FIT},
      cid          = {I:(DE-Juel1)PGI-8-20110106 / I:(DE-Juel1)ICS-8-20110106 /
                      I:(DE-Juel1)PGI-9-20110106 / $I:(DE-82)080009_20140620$},
      pnm          = {423 - Sensorics and bioinspired systems (POF2-423) / 453 -
                      Physics of the Cell (POF2-453) / 421 - Frontiers of charge
                      based Electronics (POF2-421)},
      pid          = {G:(DE-HGF)POF2-423 / G:(DE-HGF)POF2-453 /
                      G:(DE-HGF)POF2-421},
      typ          = {PUB:(DE-HGF)6},
      url          = {https://juser.fz-juelich.de/record/173312},
}