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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-227</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>Nonuniform superconducting states and Umklapp processes in ferromagnet–superconductor nanostructures (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>Khusainov</surname><given-names>M. G.</given-names></name></name-alternatives><bio xml:lang="en"><p>Kazan; branch "Vostok", Chistopol'</p></bio><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff xml:lang="en" id="aff-1"><institution>Kazan state university; Kazan state technical university</institution><country>Russian Federation</country></aff><pub-date pub-type="collection"><year>2004</year></pub-date><pub-date pub-type="epub"><day>22</day><month>01</month><year>2024</year></pub-date><volume>6</volume><issue>1</issue><issue-title>Special Issue</issue-title><fpage>103</fpage><lpage>118</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Khusainov M.G., 2024</copyright-statement><copyright-year>2024</copyright-year><copyright-holder xml:lang="ru">Khusainov M.G.</copyright-holder><copyright-holder xml:lang="en">Khusainov M.G.</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/227">https://www.mrsej.ru/jour/article/view/227</self-uri><abstract><p>For the layered ferromagnetic metal/superconductor (FM/S) structures new boundary-value problem, which takes into account a competition between the one-dimensional (1D) and three-dimensional (3D) realizations of the Larkin-Ovchinnikov-Fulde-Ferrell states, is derived. Superconductivity in the FM/S structures proves to be a superposition of the BCS pairing with zero total momentum in the S layers and the FFLO paring with nonzero pair momentum k in the FM layers. It is shown that processes of transition and mutual transformation of the BCS and FFLO pairs at the FM/S boundary occur as the Umklapp processes during which the coherent pair momentum k is conserved with exactness up to the reciprocal LOFF lattice vector G . These Umklapp processes can occur both in normal (1D states) and in the tangent (3D states) directions with respect to the FM/S interface. It is found that nonmonotonic behavior of the critical temperature Tc in the FM/S billayers is caused by the oscillations of the Cooper pairs flux through the S/FM boundary due to 3D-1D-3D phase transition cascade and switching between normal and tangent Umklapp processes. For the FM/S superlattices the existence of new π-magnetic 0π and ππ LOFF states, which at certain conditions can have a much higher Tc than earlier known 0-magnetic 00 and π0 LOFF states, is discovered. The Tc nonmonotony in the FM/S superlattices may be due to the 3D(0π)-1D(ππ)-3D(ππ) phase transitions cascade at small S interlayer thickness or due to another chain of the 3D(00)-1D(π0)-3D(π0) transitions at larger S interlayer thickness.</p></abstract><funding-group><funding-statement xml:lang="en">Работа частично поддержана фондами РФФИ ( 04-0216761 ) и CRDF (REC-007).</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">P. Koorewaar, Y. Suzuki, R. Coehoorn, et al., Phys.Rev. B49,441 (1994).</mixed-citation><mixed-citation xml:lang="en">P. Koorewaar, Y. Suzuki, R. Coehoorn, et al., Phys.Rev. 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