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@ARTICLE{Kubacki:201895,
      author       = {Kubacki, Jerzy and Molak, Andrzej and Rogala, Maciej and
                      Rodenbücher, Christian and Szot, Krzysztof},
      title        = {{M}etal–insulator transition induced by non-stoichiometry
                      of surface layer and molecular reactions on single crystal
                      {KT}a{O}$_{3}$},
      journal      = {Surface science},
      volume       = {606},
      number       = {15-16},
      issn         = {0039-6028},
      address      = {Amsterdam},
      publisher    = {Elsevier},
      reportid     = {FZJ-2015-04185},
      pages        = {1252 - 1262},
      year         = {2012},
      abstract     = {In the study we present results on topography, morphology,
                      chemical composition, electronic structure and electrical
                      properties of the (100) surface layer of KTaO3 single
                      crystal caused by sputtering with Ar+ ion beam with energy
                      of 1 keV. Several surface sensitive techniques, i.e. X-ray
                      photoelectron spectroscopy (XPS), local conductivity of
                      atomic force microscopy (LC-AFM), and Kelvin Probe Force
                      Microscopy (KPFM) were used. The observed changes in the
                      electronic structure were explained as a result of the
                      chemical decomposition of the surface layer. A correlation
                      between the electronic states which appeared in the energy
                      gap and the changes in charge state of Ta ions was found.
                      The activation energy related to averaged local conductivity
                      temperature dependence was estimated from Arrhenius plot. It
                      was also found, that variations in the local contact
                      potential difference (LCPD) indicated changes in the
                      chemical composition in nano-scale. The chemical
                      reconstruction of the KTaO3 surface modified by Ar+ ion beam
                      was deduced. This non-homogeneity corresponded to 2-D
                      non-homogeneity of the local electric conduction (LC-AFM),
                      which occurred within nano-areas after sputtering. Chemical
                      reactivity of the modified surface with CO2 and O2 was
                      observed. The reversibility of the Ar+ induced loss of
                      oxygen non-stoichiometry was observed after the sample was
                      exposed to various doses of O2. The successful reversibility
                      occurred after oxidation process at high temperature, i.e.
                      300 °C.},
      cin          = {PGI-7 / JARA-FIT},
      ddc          = {540},
      cid          = {I:(DE-Juel1)PGI-7-20110106 / $I:(DE-82)080009_20140620$},
      pnm          = {421 - Frontiers of charge based Electronics (POF2-421)},
      pid          = {G:(DE-HGF)POF2-421},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000305845600023},
      doi          = {10.1016/j.susc.2012.04.005},
      url          = {https://juser.fz-juelich.de/record/201895},
}