Selective laser spectroscopy of Mn.sup.4+./sup.-Mn.sup.4+./sup. pair centers in SrTiO.sub.3./sub. crystal

0436810 - FZÚ 2015 RIV RU eng J - Journal Article
Gilyazov, L.R. - Eremin, M.V. - Nikitin, S.I. - Yusupov, R.V. - Dejneka, Alexandr - Trepakov, Vladimír
Selective laser spectroscopy of Mn⁴⁺-Mn⁴⁺ pair centers in SrTiO₃ crystal.
Optics and Spectroscopy. Roč. 116, č. 6 (2014), 811-817. ISSN 0030-400X. E-ISSN 1562-6911
R&D Projects: GA TA ČR TA01010517; GA ČR GAP108/12/1941
Institutional support: RVO:68378271
Keywords : Zero-phonon * luminescence * antiferromagnetic
Subject RIV: BH - Optics, Masers, Lasers
Impact factor: 0.723, year: 2014

Zero-phonon lines of a pair center of Mn4+ ions are observed in the luminescence and luminescence-excitation spectra of SrTiO3:Mn crystal. Based on the experimental data, the energy-level structure of the ground state |4 A 2g ,4 A 2g > and excited state |4 A 2g ,2 E g > of the Mn4+-Mn4+ pair center is constructed. It is shown that the exchange interaction in the ground state of the Mn4+-Mn4+ pair is antiferromagnetic. Energies of the levels are calculated assuming that the pair is formed by Mn4+ ions occupying neighboring octahedral positions of Ti4+ ions along the [110] axis. Experimental values of the exchange integral in the ground state |4 A 2g ,4 A 2g > and energies of spin multiplets in the excited state |4 A 2g ,2 E g > agree well with calculation of the exchange interaction carried out within the framework of the channel model with the parameters J ξη = 32 cm4-1 and J ζζ = −45.5 cm4-1.
Permanent Link: http://hdl.handle.net/11104/0240466