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<article article-type="research-article" dtd-version="1.3" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xml:lang="en"><front><journal-meta><journal-id journal-id-type="publisher-id">mrisel</journal-id><journal-title-group><journal-title xml:lang="en">Magnetic Resonance in Solids</journal-title><trans-title-group xml:lang="ru"><trans-title>Magnetic Resonance in Solids</trans-title></trans-title-group></journal-title-group><issn pub-type="epub">2072-5981</issn><publisher><publisher-name>Kazan Federal University</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.26907/mrsej-24210</article-id><article-id custom-type="elpub" pub-id-type="custom">mrisel-263</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>Статьи</subject></subj-group></article-categories><title-group><article-title>Erbium luminescent probe in a GdFe3(BO3)4 single crystal: phase transitions and temperature measurements</article-title><trans-title-group xml:lang="ru"><trans-title></trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="western" xml:lang="en"><surname>Popova</surname><given-names>M. N.</given-names></name></name-alternatives><bio xml:lang="en"><p>Troitsk 108840</p></bio><email xlink:type="simple">popova@isan.troitsk.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="western" xml:lang="en"><surname>Diab</surname><given-names>M.</given-names></name></name-alternatives><bio xml:lang="en"><p>Troitsk 108840</p><p>Dolgoprudnyi 141700</p></bio><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="western" xml:lang="en"><surname>Boldyrev</surname><given-names>K. N.</given-names></name></name-alternatives><bio xml:lang="en"><p>Troitsk 108840</p></bio><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff xml:lang="en" id="aff-1"><institution>Institute of Spectroscopy, Russian Academy of Sciences</institution><country>Russian Federation</country></aff><aff xml:lang="en" id="aff-2"><institution>Institute of Spectroscopy, Russian Academy of Sciences; Moscow Institute of Physics and Technology (National Research University)</institution><country>Russian Federation</country></aff><pub-date pub-type="collection"><year>2024</year></pub-date><pub-date pub-type="epub"><day>29</day><month>08</month><year>2024</year></pub-date><volume>26</volume><issue>2</issue><issue-title>SPECIAL ISSUE dedicated to Boris Z. Malkin's 85th birthday</issue-title><elocation-id>24210 (7 pp.)</elocation-id><permissions><copyright-statement>Copyright &amp;#x00A9; Popova M.N., Diab M., Boldyrev K.N., 2024</copyright-statement><copyright-year>2024</copyright-year><copyright-holder xml:lang="ru">Popova M.N., Diab M., Boldyrev K.N.</copyright-holder><copyright-holder xml:lang="en">Popova M.N., Diab M., Boldyrev K.N.</copyright-holder><license xml:lang="ru" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>Данная работа распространяется под лицензией Creative Commons Attribution 4.0.</license-p></license><license xml:lang="en" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>This work is licensed under a Creative Commons Attribution 4.0 License.</license-p></license></permissions><self-uri xlink:href="https://www.mrsej.ru/jour/article/view/263">https://www.mrsej.ru/jour/article/view/263</self-uri><abstract><p>In this study, we demonstrate a detection of three phase transitions in a GdFe3 (BO3 )4 sin­gle crystal using the photoluminescence of Er3+ ions introduced in a small amount into the crystal. A first-order R32^P3121 structural phase transition is seen as a sharp spectral line shift at Ts = 127 K. Magnetic ordering of the iron subsystem at TN = 37 K causes a splitting of Er3+ Kramers doublets and is detected by a splitting of spectral lines. A first-order spin­reorientation phase transition at TR = 9 K manifests itself in a sharp change of the line splitting pattern. A comparison of the measured ratio of luminescence line intensities with the ratio of the Boltzmann populations of the involved levels is proposed to control the possible heating of the GdFe3(BO3)4:Er3+ sample by exciting radiation.</p></abstract><kwd-group xml:lang="en"><kwd>dielectric crystals</kwd><kwd>rare earth ions</kwd><kwd>phase transitions</kwd><kwd>photoluminescence</kwd><kwd>high-resolution Fourier spectroscopy</kwd><kwd>cryothermometry</kwd></kwd-group><funding-group><funding-statement xml:lang="en">The crystals used in this study was grown in the laboratory of L.N. Bezmaternykh of the L.V. Kirensky Institute of Physics, Siberian Branch of the Russian Academy of Sciences. Fi¬nancial support of the Russian Science Foundation under Grant #23-12-00047 is acknowl¬edged. The optical spectroscopy research was performed on the Unique Scientific Installa¬tion of the Institute of Spectroscopy “Multifunctional wide-range high-resolution spectroscopy” ( http://www.ckp-rf.ru/catalog/usu/508571 )</funding-statement></funding-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Bovero E., Luo Z., Huang Y., Benayas A., Jaque D., Appl. Phys. Lett. 87, 211108 (2005).</mixed-citation><mixed-citation xml:lang="en">Bovero E., Luo Z., Huang Y., Benayas A., Jaque D., Appl. Phys. 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