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@PHDTHESIS{Zubkov:819717,
      author       = {Zubkov, Evgeny},
      title        = {{A}ufbau einer {V}ierspitzen-{R}astertunnelmikroskop/
                      {R}asterelektronikroskop-{K}ombination und
                      {L}eitfähigkeitsmessungen an {S}ilizid {N}anodrähten},
      volume       = {55},
      school       = {RWTH Aachen},
      type         = {Dr.},
      address      = {Jülich},
      publisher    = {Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag},
      reportid     = {FZJ-2016-05318},
      isbn         = {978-3-89336-848-8},
      series       = {Schriften des Forschungszentrum Jülich. Reihe
                      Schlüsseltechnologien/ Key Technologies},
      pages        = {150 S.},
      year         = {2013},
      note         = {RWTH Aachen, Diss., 2013},
      abstract     = {In this work the combination of a four-tip scanning
                      tunneling microscope with a scanning electron microscope is
                      presented. By means of this apparatus it is possible to
                      perform the conductivity measurements on the in-situ
                      prepared nanostructures in ultra-high vacuum. With the aid
                      of a scanning electron microscope (SEM), it becomes possible
                      to position the tunneling tips of the four-tip scanning
                      tunneling microscope (STM), so that an arrangement for a
                      four-point probe measurement on nanostructures can be
                      obtained. The STM head was built according to the novel
                      coaxial Beetle concept. This concept allows on the one hand,
                      a very compact arrangement of the components of the STM and
                      on the other hand, the new-built STM head has a good
                      mechanical stability, in order to achieve atomic resolution
                      with all four STM units. The atomic resolution of the STM
                      units was confirmed by scanning a Si(111)-7x7 surface. The
                      thermal drift during the STM operation, as well as the
                      resonant frequencies of the mechanical structure of the STM
                      head, were determined. The scanning electron microscope
                      allows the precise and safe navigation of the tunneling tips
                      on the sample surface. Multi tip spectroscopy with up to
                      four STM units can be performed synchronously. To
                      demonstrate the capabilities of the new-built apparatus the
                      conductivity measurements were carried out on metallic
                      yttrium silicide nanowires. The nanowires were prepared by
                      the in-situ deposition of yttrium on a heated Si(110) sample
                      surface. Current-voltage curves were recorded on the
                      nanowires and on the wetting layer in-between. The curves
                      indicate an existence of the Schottky barrier between the
                      yttrium silicide nanowires and the silicon bulk. By means of
                      the two-tip measurements with a gate, the insulating
                      property of the Schottky barrier has been confirmed. Using
                      this Schottky barrier, it is possible to limit the current
                      to the nanowire and to prevent it from flowing through the
                      silicon bulk. A four-tip resistance measurement with a gate
                      has provided the resistance of the nanowire. From the
                      dimensions of the nanowire the resistivity was calculated.
                      The obtained resistivity was found to be in agreement with
                      literature values. In addition, the contact resistances of
                      the tunneling tips on the silicide nanowires were
                      determined.},
      cin          = {PGI-3},
      cid          = {I:(DE-Juel1)PGI-3-20110106},
      pnm          = {141 - Controlling Electron Charge-Based Phenomena
                      (POF3-141)},
      pid          = {G:(DE-HGF)POF3-141},
      typ          = {PUB:(DE-HGF)11},
      url          = {https://juser.fz-juelich.de/record/819717},
}