{"title":"Anti-Site Defects and Trigonal Center of Holmium in Y3Al5O12:Ho3+ Crystal According to the Results of Wideband EPR Spectroscopy","authors":"","doi":"10.3103/s1060992x23070044","DOIUrl":null,"url":null,"abstract":"<span> <h3>Abstract</h3> <p>EPR spectra of Ho<sup>3+</sup> impurity ions were recorded in single crystals of yttrium aluminum garnet (Y<sub>3</sub>Al<sub>5</sub>O<sub>12</sub>, YAG) in the frequency range of 114–410 GHz, at a temperature of 4.2 K. Besides the centers due to unusual substitutions by Y<sup>3+</sup> for Al<sup>3+</sup> ions (anti-site defects), a trigonal center was found, which indicates the replacement of Al<sup>3+</sup> ions by Ho<sup>3+</sup> ions in octahedral positions with local symmetry C<sub>3i</sub>. The magnitude of g-factor, the hyperfine structure constant and the energy interval between the main and the first excited sublevel of the main <sup>5</sup>I<sub>8</sub> muliplet were determined. A comparative analysis of the formation of satellite centers for crystals grown under different conditions is made.</p> </span>","PeriodicalId":721,"journal":{"name":"Optical Memory and Neural Networks","volume":"48 1","pages":""},"PeriodicalIF":1.0000,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Optical Memory and Neural Networks","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.3103/s1060992x23070044","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"OPTICS","Score":null,"Total":0}
引用次数: 0
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.
期刊介绍：
The journal covers a wide range of issues in information optics such as optical memory, mechanisms for optical data recording and processing, photosensitive materials, optical, optoelectronic and holographic nanostructures, and many other related topics. Papers on memory systems using holographic and biological structures and concepts of brain operation are also included. The journal pays particular attention to research in the field of neural net systems that may lead to a new generation of computional technologies by endowing them with intelligence.
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