High-pressure and magneto-optical studies of Cr-related defects in the 
lithium-rich LiNbO3:Cr,Mg crystal

Kamińska, A.; Suchocki, A.; Kobyakov, S.; Arizmendi, L.; Potemski, M.; Teran, F. J.

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High-pressure and magneto-optical studies of Cr-related defects in the lithium-rich LiNbO₃:Cr,Mg crystal

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Potemski, M.
High Magnetic Field Laboratory, Former Departments, Max Planck Institute for Solid State Research, Max Planck Society;

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Teran, F. J.
High Magnetic Field Laboratory, Former Departments, Max Planck Institute for Solid State Research, Max Planck Society;

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Citation

Kamińska, A., Suchocki, A., Kobyakov, S., Arizmendi, L., Potemski, M., & Teran, F. J. (2007). High-pressure and magneto-optical studies of Cr-related defects in the lithium-rich LiNbO₃:Cr,Mg crystal. Physical Review B, 76(14): 144117.

Cite as: https://hdl.handle.net/21.11116/0000-000E-B45D-F

Abstract

In this paper we present spectroscopic data clarifying the nature of the Cr3+ centers and Cr3+-related defect in the LiNbO3:Cr,Mg crystal containing an excess of Li+ ions. Apart from quite well known lines associated with the T-4(2)->(4)A(2) and E-2 ->(4)A(2) transitions of the Cr3+ ions, the luminescence spectrum of this crystal reveals some additional relatively narrow lines in the range of 750-860 nm. We carried out high-pressure and magneto-optical measurements of the crystallographically oriented samples of this crystal at temperature of 10 K. The measured spectra, decay times, pressure coefficients, and the dependence of the luminescence on high magnetic field show that the luminescence lines observed in lithium-rich LiNbO3:Cr,Mg originate from both Cr3+ ions and strongly antiferromagnetically coupled Cr3+-Cr3+ first nearest-neighbor pairs. The ground-state levels of the pairs can be described by the isotropic exchange interaction H=JS(1)center dot S-2+j(S-1 center dot S-2)(2), where S-1 and S-2 are the total spins of each of the two chromium ions. The obtained results enabled us to determine the ground-state spin-spin exchange constants J and j as well as the excited-state zero field splitting constant D.