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@ARTICLE{Lewin:861801,
      author       = {Lewin, Martin and Baeumer, Christoph and Gunkel, Felix and
                      Schwedt, Alexander and Gaussmann, Fabian and Wueppen, Jochen
                      and Meuffels, Paul and Jungbluth, Bernd and Mayer, Joachim
                      and Dittmann, Regina and Waser, R. and Taubner, Thomas},
      title        = {{N}anospectroscopy of {I}nfrared {P}honon {R}esonance
                      {E}nables {L}ocal {Q}uantification of {E}lectronic
                      {P}roperties in {D}oped {S}r{T}i{O} 3 {C}eramics},
      journal      = {Advanced functional materials},
      volume       = {28},
      number       = {42},
      issn         = {1616-301X},
      address      = {Weinheim},
      publisher    = {Wiley-VCH},
      reportid     = {FZJ-2019-02229},
      pages        = {1802834 -},
      year         = {2018},
      abstract     = {Among the novel materials for electronic applications and
                      novel device concepts beyond classical Si‐based CMOS
                      technology, SrTiO3 represents a prototype role model for
                      functional oxide materials: It enables resistive switching,
                      but can also form a 2D electron gas at its interface and
                      thus enables tunable transistors. However, the interplay
                      between charge carriers and defects in SrTiO3 is still under
                      debate. Infrared spectroscopy offers the possibility to
                      characterize structural and electronic properties of SrTiO3
                      in operando, but is hampered by the diffraction‐limited
                      resolution. To overcome this limitation and obtain nanoscale
                      IR spectra of donor‐doped Sr1‐xLaxTiO3 ceramics,
                      scattering‐type scanning near‐field optical microscopy
                      is applied. By exploiting plasmon–phonon coupling, the
                      local electronic properties of doped SrTiO3 are quantified
                      from a detailed spectroscopic analysis in the spectral range
                      of the near‐field ‘phonon resonance’. Single
                      crystal‐like mobility, an increase in charge carrier
                      density N and an increase in ε∞ at grain boundaries
                      (µ≈ 5.7 cm2 V−1s−1, N = 7.1 × 1019 cm−3, and ε∞
                      = 7.7) and local defects (µ≈ 5.4 cm2 V−1s−1, N = 1.3
                      × 1020 cm−3, and ε∞ = 8.8) are found. In future,
                      subsurface quantification of defects and free charge
                      carriers at interfaces and filaments in SrTiO3 can be
                      envisioned.},
      cin          = {PGI-7 / JARA-FIT},
      ddc          = {530},
      cid          = {I:(DE-Juel1)PGI-7-20110106 / $I:(DE-82)080009_20140620$},
      pnm          = {521 - Controlling Electron Charge-Based Phenomena
                      (POF3-521)},
      pid          = {G:(DE-HGF)POF3-521},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000448257800003},
      doi          = {10.1002/adfm.201802834},
      url          = {https://juser.fz-juelich.de/record/861801},
}