Observation of Two Charged States of a Nickel-Oxygen Vacancy Pair in SrTiby Paramagnetic Resonance
- 10 October 1969
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 186 (2), 361-371
- https://doi.org/10.1103/physrev.186.361
Abstract
The paramagnetic resonance of two tetragonal nickel spectra in the cubic phase of SrTi has been investigated below the structural phase transition at 105°K. Both spectra show the same rotation angle measured from the tetragonal directions as the iron-oxygen vacancy complex. This angle is 0.90±0.05° at 77°K and 1.25±0.10° at 4.2°K. One of the axial nickel spectra is stable at room temperature and has been reported before by Rubins and Low with , (). It is now assigned to a substitutional low-spin ion situated next to an oxygen-vacancy with the unpaired spin in an -type, orbital directed towards the positively charged vacancy. The second spectrum is generated by light and is thermally unstable at room temperature with , (), and can be assigned to a low-spin ion next to an oxygen vacancy associated with two electrons, the unpaired spin being in an -type, 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.
Keywords
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