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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="ru"><front><journal-meta><journal-id journal-id-type="publisher-id">mateltech</journal-id><journal-title-group><journal-title xml:lang="ru">Известия высших учебных заведений. Материалы электронной техники</journal-title><trans-title-group xml:lang="en"><trans-title>Izvestiya Vysshikh Uchebnykh Zavedenii. Materialy Elektronnoi Tekhniki = Materials of Electronics Engineering</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">1609-3577</issn><issn pub-type="epub">2413-6387</issn><publisher><publisher-name>MISIS</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.17073/1609-3577-2020-1-71-77</article-id><article-id custom-type="elpub" pub-id-type="custom">mateltech-369</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>Физические свойства и методы исследования</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>PHYSICAL CHARACTERISTICS AND THEIR STUDY</subject></subj-group></article-categories><title-group><article-title>Электропроводность монокристаллов YBa2Cu3O7-δ в условиях анионного упорядочения в слоях Cu(1)O1-δ</article-title><trans-title-group xml:lang="en"><trans-title>Electrical conductivity of YBa2Cu3O7-δ single crystals  under conditions of anionic ordering in Cu(1)O1-δ layers</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-7679-4968</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Каланда</surname><given-names>Н. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Kalanda</surname><given-names>N. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Отдел криогенных исследований</p><p>ведущий научный сотрудник</p><p>Каланда Николай Александрович</p></bio><bio xml:lang="en"><p>Nikolay A. Kalanda: Cand. Sci. (Phys.-Math.), Leading Researcher</p></bio><email xlink:type="simple">kalanda@physics.by</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Научно-практический центр Национальной академии наук Беларуси по материаловедению НАН Беларуси</institution><country>Беларусь</country></aff><aff xml:lang="en"><institution>Scientific-Practical Materials Research Centre of the NAS of Belarus, &#13;
19 P. Brovka Str., Minsk 220072</institution><country>Belarus</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2020</year></pub-date><pub-date pub-type="epub"><day>30</day><month>04</month><year>2020</year></pub-date><volume>23</volume><issue>1</issue><fpage>71</fpage><lpage>77</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Каланда Н.А., 2020</copyright-statement><copyright-year>2020</copyright-year><copyright-holder xml:lang="ru">Каланда Н.А.</copyright-holder><copyright-holder xml:lang="en">Kalanda N.A.</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://met.misis.ru/jour/article/view/369">https://met.misis.ru/jour/article/view/369</self-uri><abstract><p>Изучено влияние термоциклирующих отжигов на степень кислородного упорядочения (параметр порядка) в монокристаллах YBa2Cu3O7-δ. Установлено, что увеличение значений критической температуры начала перехода в сверхпроводящее состояние при этапных отжигах согласуется с уменьшениями параметра σс/σаb, что указывает на перераспределение электронной плотности между структурно–неоднородными плоскостями Cu2O2 и Cu1O1–δ за счет формирования длинноцепочечного упорядочения кислорода в линейных группах O4-Cu1-O4 вдоль кристаллоструктурной оси (b) элементарной ячейки, и устранению кислородных дефектов в квадратных сетках плоскостей Cu(2)O2. Доказано, что существует критическая величина анизотропии электропроводности σс/σаb, ниже которой ее поведение не коррелирует с изменением Тс. В этом случае увеличение Тс и орторомбического искажения кристаллической структуры при изотермических отжигах является результатом усиления «межслойного» взаимодействия между плоскостями Cu(2)О2 и Cu(1)О1-δ. В результате увеличивается вклад в электронную плотность состояния на уровне Ферми цепочечных слоев Cu(1)О1-δ, которые могут быть сверхпроводящими за счет туннелирования куперовских пар из плоскостей Cu2О2, формируя в них наведенную сверхпроводимость.</p></abstract><trans-abstract xml:lang="en"><p>The influence of thermocycling annealing processes on the oxygen ordering degree (order parameter) in theYBa2Cu3O7-δ single crystals have been studied. It was determined that an increase in the critical temperature of the onset of the transition to the superconducting state during step annealing procedures is consistent with decrease of the σс/σаb parameter. This fact indicates the redistribution of the electronic density between the Cu(2)O2 and Cu(1)O1-d structurally-inhomogeneous planes, due to the formation of the oxygen long-range ordering in the O(4)—Cu(1)—O(4) linear groups along the (b) crystal structure axis of the unit cell, and removal of the oxygen defects in the square nets of the Cu(2)O2 planes. The existence of a critical value of the conductivity anisotropy σс/σаb, below which its behavior does not correlate with the change of Тс, has been proved. In this case, the increase of Тс and the orthorhombic distortion of the crystal structure at the isothermal annealing processes occur due to the amplification of the «interlayer» interaction between the Cu(2)О2 and Cu(1)О1-δ planes. As a result, the contribution of the Cu(1)О1-δ chain layers in the electronstate density on the Fermi level increases. These layers could be the superconducting ones by means of the Cooper pairs tunneling from the Cu(2)О2 planes, forming the induced superconductivity there.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>высокотемпературная сверхпроводимость</kwd><kwd>монокристаллы YBa2Cu3O7-d</kwd><kwd>кислородная нестехиометрия</kwd><kwd>электропроводность</kwd><kwd>параметр порядка</kwd></kwd-group><kwd-group xml:lang="en"><kwd>high-temperature superconductivity</kwd><kwd>YBa2Cu3O7-δ single crystals</kwd><kwd>oxygen non-stoichiometry</kwd><kwd>electrical conductivity</kwd><kwd>order parameter</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Программа ЕС "Горизонт-2020"(проект H2020-MSCA-RISE-2017-778308 – SPINMULTIFILM); задание 1.02 ГПНИ Республики Беларусь «Физическое материаловедение, новые материалы и технологии», подпрограмма «Материаловедение и технологии материалов»</funding-statement><funding-statement xml:lang="en">This work was carried out in frames of the European Union project H2020-MSCA-RISE-2017-778308 — SPINMULTIFILM and the Task  No. 1.02 of the State program of scientific research of the Republic of Belarus “Physical materials science, new materials and technologies” subprogram “Materials science and materials technologies”.</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">Высокотемпературная сверхпроводимость: фундаментальные и прикладные исследования: сборник научных статей // Под ред. 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