% IMPORTANT: The following is UTF-8 encoded.  This means that in the presence
% of non-ASCII characters, it will not work with BibTeX 0.99 or older.
% Instead, you should use an up-to-date BibTeX implementation like “bibtex8” or
% “biber”.

@MASTERSTHESIS{Schffmann:830337,
      author       = {Schöffmann, Patrick},
      title        = {{P}reparation and {C}haracterisationof {T}hin
                      {S}r{C}o{O}$_x$ {F}ilms},
      school       = {Technische Universität München},
      type         = {MS},
      reportid     = {FZJ-2017-03901},
      pages        = {89},
      year         = {2017},
      note         = {Technische Universität München, Masterarbeit, 2017},
      abstract     = {Transition metal oxides are an extremely interesting class
                      of materials, exhibiting a wide range of properties, from
                      ferromagnetism to antiferromagnetism, frominsulating to
                      conducting, superconductivity, multiferroicity, and many
                      more. One special system is strontium cobaltite
                      (SrCoO$_{x}$). In its fully oxidized state SrCoO$_3$ it is a
                      ferromagnetic, conducting perovskite. If, however, the
                      oxygen content is changed slightly to SrCoO$_{2.5}$, the
                      oxygen vacancies form channels, changing the crystalline
                      structure to a brownmillerite, and the magnetic and
                      conductive properties reverse to an antiferromagnetic
                      insulator. These two crystal structures can be
                      topotactically transformed into one another without
                      destroying the crystallinity. This property makes SrCoO$_x$
                      suitable for a large variety of applications, e.g. as a
                      cathode material and catalyst for redox reactions in fuel
                      cells or magnetic switches via epitaxial strain. To take
                      advantage of the unique possibilities of SrCoO$_x$ ,
                      particularly in the field of thin film devices, it is
                      imperative to be able to grow Sr$_1$Co$_1$O$_x$ in the
                      correct stoichiometry. The aim of this thesis is to find the
                      correct deposition conditions for the growth of
                      stoichiometric SrCoO$_x$ thin film samples via molecular
                      beam epitaxy (MBE), like substrate temperature, cooling
                      speed, pressure, oxygen power, and especially the Sr and Co
                      deposition rates. Because the samples are prepared via MBE,
                      which does not use a target with an already defined
                      stoichiometry like sputter deposition or pulsed laser
                      deposition, but rather the evaporation of elemental
                      material, the stoichiometry of the samples depends on
                      several factors. The individual growth rates for Sr and Co
                      do not only depend on the amount of evaporated material, but
                      also on the sticking coeficient of the material on the
                      substrate. As the sticking coeficient is also temperature
                      dependent, there is a large parameter space that needs to be
                      investigated. Therefore, samples with varying Co/Sr
                      deposition rate ratios at different deposition temperatures
                      were produced. The stoichiometry was analysed by Rutherford
                      backscattering spectroscopy (RBS). The crystallinity of the
                      samples was studied by low energy electron diffraction
                      (LEED), reflection high energy electron diffraction (RHEED)
                      and X-ray diffraction (XRD). To investigate the surface
                      topography, atomic force microscopy (AFM) was performed.
                      X-ray reflectometry (XRR) was used to determine the global
                      surface roughness and film thickness.},
      cin          = {JCNS (München) ; Jülich Centre for Neutron Science JCNS
                      (München) ; JCNS-FRM-II / JCNS-2},
      cid          = {I:(DE-Juel1)JCNS-FRM-II-20110218 /
                      I:(DE-Juel1)JCNS-2-20110106},
      pnm          = {6212 - Quantum Condensed Matter: Magnetism,
                      Superconductivity (POF3-621) / 6G15 - FRM II / MLZ
                      (POF3-6G15) / 6G4 - Jülich Centre for Neutron Research
                      (JCNS) (POF3-623) / 524 - Controlling Collective States
                      (POF3-524)},
      pid          = {G:(DE-HGF)POF3-6212 / G:(DE-HGF)POF3-6G15 /
                      G:(DE-HGF)POF3-6G4 / G:(DE-HGF)POF3-524},
      experiment   = {EXP:(DE-MLZ)MBE-MLZ-20151210},
      typ          = {PUB:(DE-HGF)19},
      url          = {https://juser.fz-juelich.de/record/830337},
}