Electron paramagnetic resonance studies of manganese centers in SrTiO.sub.3./sub.: Non-Kramers Mn.sup.3+./sup. ions and spin-spin coupled Mn.sup.4+./sup. dimers

0378681 - FZÚ 2013 RIV US eng J - Článek v odborném periodiku
Azamat, Dmitry - Dejneka, Alexandr - Lančok, Ján - Trepakov, Vladimír - Jastrabík, Lubomír - Badalyan, A. G.
Electron paramagnetic resonance studies of manganese centers in SrTiO₃: Non-Kramers Mn³⁺ ions and spin-spin coupled Mn⁴⁺ dimers.
Journal of Applied Physics. Roč. 111, č. 10 (2012), "104119-1"-"104119-6". ISSN 0021-8979. E-ISSN 1089-7550.
[International Symposium on Integrated Functionalities (ISIF) /22./. San Juan, Puerto Rico, 13.06.2010-16.06.2010]
Grant CEP: GA TA ČR TA01010517; GA MŠMT(CZ) LM2011029; GA ČR GAP108/12/1941
Grant ostatní: SAFMAT(CZ) CZ.2.16/3.1.00/22132
Výzkumný záměr: CEZ:AV0Z10100522
Klíčová slova: electron paramagnetic resonance * X- and Q-band * SrTiO₃ doped with Mn
Kód oboru RIV: BM - Fyzika pevných látek a magnetismus
Impakt faktor: 2.210, rok: 2012

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.
Trvalý link: http://hdl.handle.net/11104/0210094