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Dominant Cr3+ Centers in LiNbO3 Under Hydrostatic Pressure
Basun S.A.1, Kaplyanskii A.A.1, Kutsenko A.B.1,2, Dierolf V.2, Troster T.2, Kapphan S.E.3, Polgar K.4
1A.F. Ioffe Physical-Technical Institute, St.-Petersburg, Russia
2Fachbereich Physik, Universitat-GH Paderborn,, Germany
3Fachbereich Physik, Universitat Osnabruck,, Germany
4Research Institute for Solid State Physics and Optics, Budapest, Hungary
Email: A.Kutsenko@pop.ioffe.rssi.ru
Поступила в редакцию: 31 октября 2000 г.
Выставление онлайн: 20 мая 2001 г.

Low temperature luminescence spectra of stoichiometric Cr : LiNbO3 and of congruent Cr,Mg : LiNbO3 were studied. Cr3+ impurity ions occupy preferentially Li+ sites (CrLi) in the LiNbO3 crystal lattice while Cr3+ substituting Nb5+ ions (CrNb) occur in addition to CrLi centers in co-doped Cr,Mg : LiNbO3 crystals. Application of high hydrostatic pressure leads to a transformation of dominant in concentration Cr3+ centers from low to high crystal field centers. Due to strong pressure induced blue shift of 4T2 state resulting in the crossing with 2E state, the replacement of broad band 4T2->4A2 emission by narrow R-lines emission 2E->4A2 occurs in luminescence spectra of the samples. This effect of level crossing was observed for the dominant Cr3+Li and Cr3+Nb centers at pressures well correlated with estimations based on 4T2-2E energy gap (230 and 1160 cm-1) and on the rate of their pressure induced change (14.35 and 11.4 cm-1/kbar respectively).
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