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@ARTICLE{Ziebinska:2738,
      author       = {Ziebinska, A. and Rytz, D. and Szot, K.},
      title        = {{B}irefringence above ${T}_c$ in single crystals of barium
                      titanate},
      journal      = {Journal of physics / Condensed matter},
      volume       = {20},
      issn         = {0953-8984},
      address      = {Bristol},
      publisher    = {IOP Publ.},
      reportid     = {PreJuSER-2738},
      pages        = {142202},
      year         = {2008},
      note         = {Record converted from VDB: 12.11.2012},
      abstract     = {The temperature dependence of the birefringence above T-c
                      in high quality BaTiO3 single crystals has been measured
                      with very high accuracy. On the basis of literature data,
                      the behaviour of the anomalous birefringence can be
                      explained by the existence of polar clusters
                      (microregions/nanoregions) connected with correlated jumps
                      between the off-centre positions of Ti ions inside the
                      oxygen octahedra. The underlying origin of the polar
                      clusters is an intrinsic effect connected with the
                      interdependence of the structural and polar soft modes
                      (Bussmann-Holder et al 2007 Phys. Rev. Lett. 99 167603).
                      These clusters locally break the intrinsic cubic symmetry
                      and the phase above T-c becomes birefringent. A
                      birefringence Delta n of the order of 10(-5) has been found
                      up to about 30 degrees above T-c. In this temperature range
                      T-c < T < T-c + 30 K, the function Delta n(T) exhibits a
                      thermal hysteresis: the values of Delta n were higher on
                      heating than on cooling. A characteristic feature is the
                      existence of a local Delta n(T) maximum at a temperature
                      close to T-c on the high temperature side that appears due
                      to a specific cluster-cluster interaction. Since the values
                      of Delta n(T) runs were not dependent on the crystal
                      thickness, one can conclude that in this limited temperature
                      range above T-c the birefringence is an inherent feature of
                      the crystal.},
      keywords     = {J (WoSType)},
      cin          = {IFF-6 / JARA-FIT},
      ddc          = {530},
      cid          = {I:(DE-Juel1)VDB786 / $I:(DE-82)080009_20140620$},
      pnm          = {Grundlagen für zukünftige Informationstechnologien},
      pid          = {G:(DE-Juel1)FUEK412},
      shelfmark    = {Physics, Condensed Matter},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000254175100002},
      doi          = {10.1088/0953-8984/20/14/142202},
      url          = {https://juser.fz-juelich.de/record/2738},
}