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Anti-Site Defects and Trigonal Center of Holmium in Y3Al5O12:Ho3+ Crystal According to the Results of Wideband EPR Spectroscopy

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Abstract

EPR spectra of Ho3+ impurity ions were recorded in single crystals of yttrium aluminum garnet (Y3Al5O12, YAG) in the frequency range of 114–410 GHz, at a temperature of 4.2 K. Besides the centers due to unusual substitutions by Y3+ for Al3+ ions (anti-site defects), a trigonal center was found, which indicates the replacement of Al3+ ions by Ho3+ ions in octahedral positions with local symmetry C3i. The magnitude of g-factor, the hyperfine structure constant and the energy interval between the main and the first excited sublevel of the main 5I8 muliplet were determined. A comparative analysis of the formation of satellite centers for crystals grown under different conditions is made.

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ACKNOWLEDGMENTS

The authors are grateful to V.A. Shustov for the orientation of the crystal on an X-ray diffractometer and A.M. Shegeda for providing sample N1.

Funding

The study was supported by the Russian Foundation for Basic Research, grant no. 25-52-05002 Arm_a and the Science Committee of RA, in the frames of project no. 1-6/23-I/IPR. The work at KPhTI FRC KazSC RAS was carried out within the framework of the Government assignment.

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Authors and Affiliations

  1. Ioffe Institute, St. Petersburg, Russia

    G. R. Asatryan

  2. Zavoisky Physical-Technical Institute, FRC Kazan Scientific Center, Russian Academy of Sciences, 420029, Kazan, Russia

    G. S. Shakurov & N. M. Lyadov

  3. Institute for Physical Research, National Academy of Sciences of Armenia, 0204, Ashtarak-2, Armenia

    K. L. Hovhannesyan & A. G. Petrosyan

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  1. G. R. Asatryan
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  2. G. S. Shakurov
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  3. N. M. Lyadov
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  4. K. L. Hovhannesyan
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  5. A. G. Petrosyan
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Correspondence to A. G. Petrosyan.

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Asatryan, G.R., Shakurov, G.S., Lyadov, N.M. et al. Anti-Site Defects and Trigonal Center of Holmium in Y3Al5O12:Ho3+ Crystal According to the Results of Wideband EPR Spectroscopy. Opt. Mem. Neural Networks 32 (Suppl 3), S356–S361 (2023). https://doi.org/10.3103/S1060992X23070044

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  • DOI: https://doi.org/10.3103/S1060992X23070044

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