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Selective laser spectroscopy of Mn.sup.4+./sup.-Mn.sup.4+./sup. pair centers in SrTiO.sub.3./sub. crystal
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SYSNO ASEP 0436810 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Selective laser spectroscopy of Mn4+-Mn4+ pair centers in SrTiO3 crystal Author(s) Gilyazov, L.R. (RU)
Eremin, M.V. (RU)
Nikitin, S.I. (RU)
Yusupov, R.V. (RU)
Dejneka, Alexandr (FZU-D) RID, ORCID
Trepakov, Vladimír (FZU-D) RIDSource Title Optics and Spectroscopy - ISSN 0030-400X
Roč. 116, č. 6 (2014), 811-817Number of pages 7 s. Language eng - English Country RU - Russian Federation Keywords Zero-phonon ; luminescence ; antiferromagnetic Subject RIV BH - Optics, Masers, Lasers R&D Projects TA01010517 GA TA ČR - Technology Agency of the Czech Republic (TA ČR) GAP108/12/1941 GA ČR - Czech Science Foundation (CSF) Institutional support FZU-D - RVO:68378271 UT WOS 000339948200001 EID SCOPUS 84903766861 DOI https://doi.org/10.1134/S0030400X14060071 Annotation 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. Workplace Institute of Physics Contact Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579 Year of Publishing 2015
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