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• W1995230223 endingPage "371" @default.
• W1995230223 startingPage "361" @default.
• W1995230223 abstract "The paramagnetic resonance of two tetragonal nickel spectra in the cubic phase of SrTi${mathrm{O}}_{3}$ has been investigated below the structural phase transition at 105ifmmode^circelsetextdegreefi{}K. Both spectra show the same rotation angle measured from the tetragonal directions as the iron-oxygen vacancy complex. This angle is 0.90ifmmodepmelsetextpmfi{}0.05ifmmode^circelsetextdegreefi{} at 77ifmmode^circelsetextdegreefi{}K and 1.25ifmmodepmelsetextpmfi{}0.10ifmmode^circelsetextdegreefi{} at 4.2ifmmode^circelsetextdegreefi{}K. One of the axial nickel spectra is stable at room temperature and has been reported before by Rubins and Low with ${g}_{mathrm{II}}=2.029ifmmodepmelsetextpmfi{}0.01$, ${g}_{ensuremath{perp}}=2.352ifmmodepmelsetextpmfi{}0.001$ (${g}_{mathrm{II}}<{g}_{ensuremath{perp}}$). It is now assigned to a substitutional low-spin ${mathrm{Ni}}^{3+}$ ion situated next to an oxygen-vacancy with the unpaired spin in an $e$-type, $3{z}^{2}ensuremath{-}{r}^{2}$ orbital directed towards the positively charged vacancy. The second spectrum is generated by light and is thermally unstable at room temperature with ${g}_{mathrm{II}}=2.375ifmmodepmelsetextpmfi{}0.001$, ${g}_{ensuremath{perp}}=2.084ifmmodepmelsetextpmfi{}0.001$ (${g}_{mathrm{II}}>{g}_{ensuremath{perp}}$), and can be assigned to a low-spin ${mathrm{Ni}}^{3+}$ ion next to an oxygen vacancy associated with two electrons, the unpaired spin being in an $e$-type, ${x}^{2}ensuremath{-}{y}^{2}$ orbital directed away from the near neutral vacancy. Observed titanium superhyperfine structure supports these assignments. The importance of this first microscopic evidence of two differently charged states of an oxygen-vacancy defect complex in high-dielectric-constant oxide materials is emphasized. The difficulty of observing by EPR pairs when the defects are singly charged is discussed." @default.
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• W1995230223 date "1969-10-10" @default.
• W1995230223 modified "2023-10-14" @default.
• W1995230223 title "Observation of Two Charged States of a Nickel-Oxygen Vacancy Pair in SrTi<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>O</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>by Paramagnetic Resonance" @default.
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• W1995230223 doi "https://doi.org/10.1103/physrev.186.361" @default.
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