| Autor: |
K.N. Boldyrev, N.M. Abishev, I.E. Mumdzi, S.I. Nikitin, B.Z. Malkin, R.V. Yusupov, M.N. Popovа |
| Jazyk: |
angličtina |
| Rok vydání: |
2022 |
| Předmět: |
|
| Zdroj: |
Optical Materials: X, Vol 14, Iss , Pp 100155- (2022) |
| Druh dokumentu: |
article |
| ISSN: |
2590-1478 |
| DOI: |
10.1016/j.omx.2022.100155 |
| Popis: |
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. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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