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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.

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Low temperature luminescence spectra of stoichiometric Cr : LiNbO₃ and of congruent Cr,Mg : LiNbO₃ were studied. Cr³⁺ impurity ions occupy preferentially Li⁺ sites (Cr_Li) in the LiNbO₃ crystal lattice while Cr³⁺ substituting Nb⁵⁺ ions (Cr_Nb) occur in addition to Cr_Li 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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