<article 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" article-type="research-article" dtd-version="1.2" xml:lang="ru"><front><journal-meta><journal-id journal-id-type="publisher-id">Journal of Experimental and Theoretical Physics</journal-id><journal-title-group><journal-title>Journal of Experimental and Theoretical Physics</journal-title></journal-title-group><issn publication-format="print">0044-4510</issn><issn publication-format="electronic">3034-641X</issn><publisher><publisher-name>Russian Academy of Science</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.7868/S3034641X25110075</article-id><title-group><article-title>Влияние внешнего магнитного поля на динамические и статические свойства анизотропного негейзенберговского магнетика со спином  = 1</article-title><trans-title-group xml:lang="ru"><trans-title>Влияние внешнего магнитного поля на динамические и статические свойства анизотропного негейзенберговского магнетика со спином  = 1</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><contrib-id contrib-id-type="orcid"></contrib-id><name-alternatives><name xml:lang="en"><surname>Kosmacev</surname><given-names>O.A.</given-names></name><name xml:lang="ru"><surname>Космачев</surname><given-names>О.А. </given-names></name></name-alternatives><email>kosmacev_oa_noemail@ras.ru</email><xref ref-type="aff" rid="aff-1"></xref><xref ref-type="aff" rid="aff-2"></xref></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid"></contrib-id><name-alternatives><name xml:lang="en"><surname>Fadeeva</surname><given-names>E.O.</given-names></name><name xml:lang="ru"><surname>Фадеева</surname><given-names>Е.О. </given-names></name></name-alternatives><email>fadeeva_eo_noemail@ras.ru</email><xref ref-type="aff" rid="aff-3"></xref></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid"></contrib-id><name-alternatives><name xml:lang="en"><surname>Fridman</surname><given-names>U.A.</given-names></name><name xml:lang="ru"><surname>Фридман</surname><given-names>Ю.А. </given-names></name></name-alternatives><email>fridman_ua_noemail@ras.ru</email><xref ref-type="aff" rid="aff-5"></xref></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid"></contrib-id><name-alternatives><name xml:lang="en"><surname>Arygina</surname><given-names>E.A.</given-names></name><name xml:lang="ru"><surname>Ярыгина</surname><given-names>Е.А. </given-names></name></name-alternatives><email>arygina_ea_noemail@ras.ru</email><xref ref-type="aff" rid="aff-7"></xref></contrib></contrib-group><aff-alternatives id="aff-1"><aff><institution xml:lang="ru">Крымский Федеральный Университет им. В. И. Вернадского</institution><institution xml:lang="en">Крымский Федеральный Университет им. В. И. Вернадского</institution></aff></aff-alternatives><aff-alternatives id="aff-2"><aff><institution xml:lang="ru"></institution><institution xml:lang="en"></institution></aff></aff-alternatives><aff-alternatives id="aff-3"><aff><institution xml:lang="ru">Крымский Федеральный Университет им. В. И. Вернадского</institution><institution xml:lang="en">Крымский Федеральный Университет им. В. И. Вернадского</institution></aff></aff-alternatives><aff-alternatives id="aff-5"><aff><institution xml:lang="ru">Крымский Федеральный Университет им. В. И. Вернадского</institution><institution xml:lang="en">Крымский Федеральный Университет им. В. И. Вернадского</institution></aff></aff-alternatives><aff-alternatives id="aff-7"><aff><institution xml:lang="ru">Крымский Федеральный Университет им. В. И. Вернадского</institution><institution xml:lang="en">Крымский Федеральный Университет им. В. И. Вернадского</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2025-05-01" publication-format="electronic"><day>01</day><month>05</month><year>2025</year></pub-date><volume>168</volume><issue>5</issue><fpage>666</fpage><lpage>675</lpage><abstract xml:lang="en"><p>Изучено поведение негейзенберговского магнетика с одноионной анизотропией «легкая плоскость» во внешнем магнитном поле, перпендикулярном базисной плоскости. Установлено, что при наличии большого биквадратичного обменного взаимодействия конкуренция одноионной анизотропии и внешнего магнитного поля приводит к образованию «угловой слабо намагниченной» фазы с ненулевым средним магнитным моментом. Показано, что в зависимости от соотношения материальных параметров в системе кроме угловой слабо намагниченной фазы реализуются парамагнитная фаза (при больших значениях магнитного поля) и квадрупольная фаза (при больших значениях константы одноионной анизотропии). Анализ свободной энергии и спектров элементарных возбуждений позволяет построить фазовую диаграмму исследуемой системы и установить тип фазовых переходов.</p></abstract><trans-abstract xml:lang="ru"><p>Изучено поведение негейзенберговского магнетика с одноионной анизотропией «легкая плоскость» во внешнем магнитном поле, перпендикулярном базисной плоскости. Установлено, что при наличии большого биквадратичного обменного взаимодействия конкуренция одноионной анизотропии и внешнего магнитного поля приводит к образованию «угловой слабо намагниченной» фазы с ненулевым средним магнитным моментом. Показано, что в зависимости от соотношения материальных параметров в системе кроме угловой слабо намагниченной фазы реализуются парамагнитная фаза (при больших значениях магнитного поля) и квадрупольная фаза (при больших значениях константы одноионной анизотропии). Анализ свободной энергии и спектров элементарных возбуждений позволяет построить фазовую диаграмму исследуемой системы и установить тип фазовых переходов.</p></trans-abstract></article-meta></front><body></body><back><ref-list><ref id="B1"><label>B1</label><citation-alternatives><mixed-citation xml:lang="ru">А. Ф. Андреев, В. И. Марченко, УФН 130, 39 (1980).</mixed-citation><mixed-citation xml:lang="en"></mixed-citation></citation-alternatives></ref><ref id="B2"><label>B2</label><citation-alternatives><mixed-citation xml:lang="ru">А. Ф. Андреев, И. А. Грищук, ЖЭТФ 87, 467 (1984) [А. F. Andreev and I. A. Grischuk, Sov. Phys. JETP 60, 267 (1984)].</mixed-citation><mixed-citation xml:lang="en"></mixed-citation></citation-alternatives></ref><ref id="B3"><label>B3</label><citation-alternatives><mixed-citation xml:lang="ru">L. E. Svistov, T. Fujita, H. Yamaguchi, S. Kimura, K. Omura, A. Prokofiev, A. I. Smirnov, Z. Honda, and M. 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