Electron paramagnetic resonance studies of manganese centers in SrTiO3: Non-Kramers Mn3+ ions and spin-spin coupled Mn4+ dimers
Abstract
An X- and Q-band electron paramagnetic resonance (EPR) study is reported on SrTiO3 single crystals doped with 0.5 at. % MnO. The EPR spectra originating from the S = 2 ground state of the Mn3+ ions are shown to belong to three distinct types of Jahn-Teller centers. The ordering of the oxygen vacancies due to the reduction treatment of the samples and the consequent formation of an oxygen vacancy associated with the Mn3+ centers is explained in terms of the localized charge compensation. The EPR spectra of the SrTiO3:Mn crystals show the presence of next-nearest-neighbor exchange coupled Mn4+ pairs in the <110> directions.
- Publication:
-
Journal of Applied Physics
- Pub Date:
- May 2012
- DOI:
- 10.1063/1.4723653
- arXiv:
- arXiv:1112.1560
- Bibcode:
- 2012JAP...111j4119A
- Keywords:
-
- charge compensation;
- ground states;
- Jahn-Teller effect;
- manganese compounds;
- paramagnetic resonance;
- strontium compounds;
- vacancies (crystal);
- 76.30.Lh;
- 61.72.jd;
- 71.70.Ej;
- Other ions and impurities;
- Vacancies;
- Spin-orbit coupling Zeeman and Stark splitting Jahn-Teller effect;
- Condensed Matter - Materials Science;
- Condensed Matter - Other Condensed Matter
- E-Print:
- 17 pages, 8 figures