High-resolution spectroscopic studies of random strains in ferroelastic domains in a LaAlO3:Tm3+ single crystal
Comprehensive spectroscopic, magnetization, and theoretical studies of a LaAlO3:Tm3+ single crystal in the ferroelastic R3‾c phase are reported. The Tm3+ ions substitute for the La3+ ions at sites with the D3 symmetry. High-resolution absorption, photoluminescence, and site-selective emission and ex...
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| Format: | Article |
| Language: | English |
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Elsevier
2022-05-01
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| Series: | Optical Materials: X |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2590147822000201 |
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| author | K.N. Boldyrev N.M. Abishev I.E. Mumdzi S.I. Nikitin B.Z. Malkin R.V. Yusupov M.N. Popovа |
| author_facet | K.N. Boldyrev N.M. Abishev I.E. Mumdzi S.I. Nikitin B.Z. Malkin R.V. Yusupov M.N. Popovа |
| author_sort | K.N. Boldyrev |
| collection | DOAJ |
| description | Comprehensive spectroscopic, magnetization, and theoretical studies of a LaAlO3:Tm3+ single crystal in the ferroelastic R3‾c phase are reported. The Tm3+ ions substitute for the La3+ ions at sites with the D3 symmetry. High-resolution absorption, photoluminescence, and site-selective emission and excitation spectra were measured in the broad spectral range from 4000 to 28000 cm−1 at temperatures 4.2–5 K. The two-fold degeneracy of the ground state of Tm3+ was uncovered by magnetization measurements. Energies and symmetry properties of wave functions of crystal-field levels of the Tm3+ ions were determined and successfully reproduced by crystal-field calculations. Specific profiles with a dip at the center of spectral lines corresponding to transitions involving non-Kramers doublets give evidence for random strains in the studied multidomain sample. The value of 0.1–0.8 cm−1 of deformational splitting of non-Kramers doublets exceeds hyperfine splittings by more than an order of magnitude. The observed line shapes were successfully modeled assuming the interaction of Tm3+ ions with random deformations described by the generalized two-dimensional Lorentzian distribution with the width of (7 ± 0.5)⋅ 10−4. The simulation was performed using the electron-deformation coupling constants calculated in the framework of the exchange-charge model. |
| first_indexed | 2024-12-11T18:27:23Z |
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| id | doaj.art-fd63b0b421d74dabbc1e0325877a1c7d |
| institution | Directory Open Access Journal |
| issn | 2590-1478 |
| language | English |
| last_indexed | 2024-12-11T18:27:23Z |
| publishDate | 2022-05-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Optical Materials: X |
| spelling | doaj.art-fd63b0b421d74dabbc1e0325877a1c7d2022-12-22T00:55:02ZengElsevierOptical Materials: X2590-14782022-05-0114100155High-resolution spectroscopic studies of random strains in ferroelastic domains in a LaAlO3:Tm3+ single crystalK.N. Boldyrev0N.M. Abishev1I.E. Mumdzi2S.I. Nikitin3B.Z. Malkin4R.V. Yusupov5M.N. Popovа6Institute of Spectroscopy RAS, Troitsk, Moscow, 108840, Russia; Corresponding author.Kazan Federal University, Institute of Physics, Kazan, 420008, RussiaKazan Federal University, Institute of Physics, Kazan, 420008, RussiaKazan Federal University, Institute of Physics, Kazan, 420008, RussiaKazan Federal University, Institute of Physics, Kazan, 420008, RussiaKazan Federal University, Institute of Physics, Kazan, 420008, RussiaInstitute of Spectroscopy RAS, Troitsk, Moscow, 108840, RussiaComprehensive spectroscopic, magnetization, and theoretical studies of a LaAlO3:Tm3+ single crystal in the ferroelastic R3‾c phase are reported. The Tm3+ ions substitute for the La3+ ions at sites with the D3 symmetry. High-resolution absorption, photoluminescence, and site-selective emission and excitation spectra were measured in the broad spectral range from 4000 to 28000 cm−1 at temperatures 4.2–5 K. The two-fold degeneracy of the ground state of Tm3+ was uncovered by magnetization measurements. Energies and symmetry properties of wave functions of crystal-field levels of the Tm3+ ions were determined and successfully reproduced by crystal-field calculations. Specific profiles with a dip at the center of spectral lines corresponding to transitions involving non-Kramers doublets give evidence for random strains in the studied multidomain sample. The value of 0.1–0.8 cm−1 of deformational splitting of non-Kramers doublets exceeds hyperfine splittings by more than an order of magnitude. The observed line shapes were successfully modeled assuming the interaction of Tm3+ ions with random deformations described by the generalized two-dimensional Lorentzian distribution with the width of (7 ± 0.5)⋅ 10−4. The simulation was performed using the electron-deformation coupling constants calculated in the framework of the exchange-charge model.http://www.sciencedirect.com/science/article/pii/S2590147822000201Optical spectraCrystal-field levelsFerroelastic domainsDeformational fine structureRandom strainsDistribution function |
| spellingShingle | K.N. Boldyrev N.M. Abishev I.E. Mumdzi S.I. Nikitin B.Z. Malkin R.V. Yusupov M.N. Popovа High-resolution spectroscopic studies of random strains in ferroelastic domains in a LaAlO3:Tm3+ single crystal Optical Materials: X Optical spectra Crystal-field levels Ferroelastic domains Deformational fine structure Random strains Distribution function |
| title | High-resolution spectroscopic studies of random strains in ferroelastic domains in a LaAlO3:Tm3+ single crystal |
| title_full | High-resolution spectroscopic studies of random strains in ferroelastic domains in a LaAlO3:Tm3+ single crystal |
| title_fullStr | High-resolution spectroscopic studies of random strains in ferroelastic domains in a LaAlO3:Tm3+ single crystal |
| title_full_unstemmed | High-resolution spectroscopic studies of random strains in ferroelastic domains in a LaAlO3:Tm3+ single crystal |
| title_short | High-resolution spectroscopic studies of random strains in ferroelastic domains in a LaAlO3:Tm3+ single crystal |
| title_sort | high resolution spectroscopic studies of random strains in ferroelastic domains in a laalo3 tm3 single crystal |
| topic | Optical spectra Crystal-field levels Ferroelastic domains Deformational fine structure Random strains Distribution function |
| url | http://www.sciencedirect.com/science/article/pii/S2590147822000201 |
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