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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 custom-type="elpub" pub-id-type="custom">mrisel-217</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>Effect of diamagnetic dilution on spin dynamics in manganites (in Russian)</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>Atsarkin</surname><given-names>V. A.</given-names></name></name-alternatives><bio xml:lang="en"><p>125009 Moscow</p></bio><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="western" xml:lang="en"><surname>Demidov</surname><given-names>V. V.</given-names></name></name-alternatives><bio xml:lang="en"><p>125009 Moscow</p></bio><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="western" xml:lang="en"><surname>Gotovtsev</surname><given-names>G. D.</given-names></name></name-alternatives><bio xml:lang="en"><p>125009 Moscow</p></bio><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="western" xml:lang="en"><surname>Noginova</surname><given-names>N. E.</given-names></name></name-alternatives><bio xml:lang="en"><p>125009 Moscow; Norfolk, VA 23504, USA</p></bio><xref ref-type="aff" rid="aff-2"/></contrib></contrib-group><aff xml:lang="en" id="aff-1"><institution>Institute of Radio Engineering and Electronics RAS</institution><country>Russian Federation</country></aff><aff xml:lang="en" id="aff-2"><institution>Institute of Radio Engineering and Electronics RAS; Norfolk State University</institution><country>Russian Federation</country></aff><pub-date pub-type="collection"><year>2004</year></pub-date><pub-date pub-type="epub"><day>21</day><month>01</month><year>2024</year></pub-date><volume>6</volume><issue>1</issue><issue-title>Special Issue</issue-title><fpage>1</fpage><lpage>9</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Atsarkin V.A., Demidov V.V., Gotovtsev G.D., Noginova N.E., 2024</copyright-statement><copyright-year>2024</copyright-year><copyright-holder xml:lang="ru">Atsarkin V.A., Demidov V.V., Gotovtsev G.D., Noginova N.E.</copyright-holder><copyright-holder xml:lang="en">Atsarkin V.A., Demidov V.V., Gotovtsev G.D., Noginova N.E.</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/217">https://www.mrsej.ru/jour/article/view/217</self-uri><abstract><p>In the magnetically diluted LaMnxGa1-xO3 single crystals, the EPR spectra of the Mn ions (at 0.02 &lt;=  x &lt;= 1), as well as NMR and nuclear spin-lattice relaxation of 69Ga and 71Ga nuclei have been investigated. The analysis of the EPR spectra enabled one to follow the exchange narrowing effect to the point of appearance of a single Lorentzian line at x  &gt;=  0.2. The transition from the antiferromagnetic to ferromagnetic type of spin ordering is confirmed under condition of the diamagnetic dilution with Ga, starting from x  = 0.8. At x  = 0.1, unusual broadening and splitting of the EPR spectrum are found upon cooling; this can be assigned to the effect of thermally activated internal motion with characteristic energy Ea of about 50 meV. The study of nuclear spin-lattice relaxation was performed in the temperature range of 190-390 K. The obtained data support the existence of the internal motion with the same value of Ea . 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