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@ARTICLE{Rodenbcher:818145,
      author       = {Rodenbücher, C. and Luysberg, M. and Schwedt, A. and
                      Havel, V. and Gunkel, F. and Mayer, J. and Waser, R.},
      title        = {{H}omogeneity and variation of donor doping in
                      {V}erneuil-grown {S}r{T}i{O}$_{3}$:{N}b single crystals},
      journal      = {Scientific reports},
      volume       = {6},
      issn         = {2045-2322},
      address      = {London},
      publisher    = {Nature Publishing Group},
      reportid     = {FZJ-2016-04661},
      pages        = {32250},
      year         = {2016},
      abstract     = {The homogeneity of Verneuil-grown SrTiO3:Nb crystals was
                      investigated. Due to the fast crystal growth process,
                      inhomogeneities in the donor dopant distribution and
                      variation in the dislocation density are expected to occur.
                      In fact, for some crystals optical studies show variations
                      in the density of Ti3+ states on the microscale and a
                      cluster-like surface conductivity was reported in
                      tip-induced resistive switching studies. However, our
                      investigations by TEM, EDX mapping, and 3D atom probe reveal
                      that the Nb donors are distributed in a statistically random
                      manner, indicating that there is clearly no inhomogeneity on
                      the macro-, micro-, and nanoscale in high quality
                      Verneuil-grown crystals. In consequence, the electronic
                      transport in the bulk of donor-doped crystals is homogeneous
                      and it is not significantly channelled by extended defects
                      such as dislocations which justifies using this material,
                      for example, as electronically conducting substrate for
                      epitaxial oxide film growth.},
      cin          = {PGI-7 / PGI-5},
      ddc          = {000},
      cid          = {I:(DE-Juel1)PGI-7-20110106 / I:(DE-Juel1)PGI-5-20110106},
      pnm          = {521 - Controlling Electron Charge-Based Phenomena
                      (POF3-521)},
      pid          = {G:(DE-HGF)POF3-521},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000382237700002},
      doi          = {10.1038/srep32250},
      url          = {https://juser.fz-juelich.de/record/818145},
}