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The interplay of phonon and magnetic mechanism of pairing in strongly correlated electron system of high-Tc cuprates / S. G. Ovchinnikov, E. I. Shneyder // Seventh International Conference on New Theoreties, Discoveries & Applications of Superconductors and Related Materials and Zhongguancun International Consortium of R&D of Superconductivity Technology Inaugurating Meeting : May 13-16, 2009, Beijing, China. - Ст. S1E0900

Доп.точки доступа:
Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Shneyder, E. I.; Шнейдер, Елена Игоревна; International Conference on New Theoreties, Discoveries & Applications of Superconductors and Related Materials(17 ; 2009 ; MAY ; Beijing, China); Zhongguancun International Consortium of R&D of Superconductivity Technology Inaugurating Meeting(2009 ; MAY ; Beijing, China)
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    Самопроизвольное вращение магнитов, левитирующих над высокотемпературным сверхпроводником / Д. М. Гохфельд, С. Ю. Шаломов, Д. Б. Сультимов, М. И. Петров // Сверхпроводимость: фунд. и приклад. исслед. - 2024. - № 1. - С. 34-40 ; Supercond. Fund. Appl. Res., DOI 10.62539/2949-5644-2024-0-1-34-40. - Библиогр.: 11. - Авторы выражают благодарность А.Л. Фрейдману за создание сверхпроводящей платформы, С.В. Семенову за помощь с температурными измерениями, а также С.В. Комогорцеву за полезные обсуждения . - ISSN 2949-5644. - ISSN 2949-5660
   Перевод заглавия: Spontaneous rotation of magnets levitating above high-Tc superconductor
Кл.слова (ненормированные):
тепловая машина -- левитация -- REBCO -- композитная сверхпроводящая лента -- NdFeB -- heat machine -- levitation -- REBCO -- composite superconducting tape -- NdFeB
Аннотация: Левитация постоянного магнита цилиндрической формы над высокотемпературным сверхпроводником, охлаждаемым жидким азотом, сопровождается спонтанными колебаниями, переходящими во вращение. Причиной вращения является неоднородность намагниченности магнита, вызванная градиентом температур вдоль вертикальной оси. Проведен эксперимент по левитации магнитов Nd–Fe–B над композитным высокотемпературным сверхпроводником. Результаты эксперимента подтверждают, что частота вращения зависит от намагниченности верхней и нижней половин магнита. Предложены способы контроля частоты вращения левитирующего магнита.
Levitation of a cylindrical permanent magnet over a high-temperature superconductor cooled by liquid nitrogen can be accompanied by spontaneous oscillations and rotation. The reason for spontaneous rotation of the magnet is magnetization inhomogeneity induced by the temperature gradient. An experiment was carried out on the levitation of Nd–Fe–B magnets over a composite high-temperature superconductor. The experimental results confirm that the rotation frequency depends on the difference in the magnetization values in its upper and lower halves of the magnet. Methods for controlling the rotation frequency of a levitating magnet are proposed.

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Держатели документа:
Институт физики им. Л.В. Киренского ФИЦ КНЦ СО РАН, ул. Академгородок 50/38, 660036, Красноярск, Россия
Красноярский Государственный Педагогический Университет им. В.П. Астафьева, ул. А. Лебедевой 89, 660049, Красноярск, Россия
Физико-математическая школа Сибирского Федерального Университета, пр. Свободный 79, 660041, Красноярск, Россия

Доп.точки доступа:
Гохфельд, Денис Михайлович; Gokhfeld, D. M.; Шаломов, С. Ю.; Сультимов, Д. Б.; Петров, Михаил Иванович; Petrov, M. I.

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Influence of the DyxCo1-x–Bi interface on the magnetic properties of DyxCo1-x/Bi/Py three-layer structures / N. N. Kosyrev, G. S. Patrin, Ya. G. Shiyan [et al.] // J. Supercond. Nov. Magn. - 2024. - Vol. 37, Is. 2. - P. 419-424, DOI 10.1007/s10948-024-06690-0. - Cited References: 15. - The authors are grateful to R.Yu. Rudenko for carrying out measurements using an atomic force microscope. - The research was conducted according to the state assignment of the Ministry of Science and Higher Education of the Russian Federation and the Federal State Autonomous Educational Institution of Higher Education Siberian Federal University (No. FSRZ-2023–0008) . - ISSN 1557-1939. - ISSN 1557-1947
Кл.слова (ненормированные):
Multilayer magnetic films -- Exchange interaction -- Exchange bias -- Ellipsometry -- SQUID magnetometry
Аннотация: The interlayer interactions in multilayer systems with a non-magnetic semimetallic interlayer are great of interest. The magnetic and structural properties of the DyxCo1-x/Bi/Py systems (17 ˂ x ˂ 26 at.%) have been studied. The temperature dependences of magnetization in the range 4.2–300 K were measured for the first time. The influence of the bismuth interlayer thickness on the exchange interaction between the DyCo and Py layers was found as well as the critical value of its thickness. The obtained atypical value of the period of exchange bias oscillations was explained by the formation of bismuth compounds with dysprosium–pnictogenides at bismuth thicknesses below the critical value. The interface was investigated by spectral ellipsometry in the range 2–5 eV. The information on the structure of the surface obtained by atomic force microscopy was used to create a multilayer model for fitting experimental ellipsometric data. Analysis of the optical properties showed that pnictogenide Dy3Bi2 is formed at the interface, which affects the general magnetic state of the samples studied.

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Держатели документа:
Institute of Engineering Physics and Radio Electronics, Siberian Federal University, 79 Svobodny Pr., 660041, Krasnoyarsk, Russia
Kirensky Institute of Physics, Federal Research Center KSC Siberian Branch Russian Academy of Sciences, Akademgorodok 50, Building 38, 660036, Krasnoyarsk, Russia
Achinsk Branch of Krasnoyarsk State Agrarian University, Achinsk, Russia

Доп.точки доступа:
Kosyrev, N. N.; Косырев, Николай Николаевич; Patrin, G. S.; Патрин, Геннадий Семёнович; Shiyan, Ya. G.; Шиян, Ярослав Германович; Volchenko, E. N.; Волченко Е. Н.; Yakovchuk, V. Yu.; Яковчук, Виктор Юрьевич; Komarov, V. A.; Комаров, Василий Андреевич; Semenov, S. V.; Семёнов, Сергей Васильевич
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Gokhfeld, D. M.
Magnetic flux trapping in porous high-Tc superconductors / D. Gokhfeld // Phys. C: Supercond. Appl. - 2024. - Vol. 619. - Ст. 1354486, DOI 10.1016/j.physc.2024.1354486. - Cited References: 39 . - ISSN 0921-4534. - ISSN 1873-2143
Кл.слова (ненормированные):
Trapped magnetic field -- Pinning -- Critical current -- Magnetization -- YBCO -- REBCO -- Porosity -- Surface barrier
Аннотация: Porosity affects the properties of high-Tc superconductors and can improve their performance by enhancing oxygenation, cryocooling, etc. Among other factors, the presence of pores plays a significant role in the process of magnetic flux trapping. Relationships with the porosity manifest in the irreversibility field, the full penetration field, and the remnant magnetization of the samples. To account for the effect of porosity on the trapped magnetic flux into type-II superconductors, a simple toy model is suggested. Generally, as the porosity increases, the trapped flux and related parameters tend to diminish. However, in the case of microscopic samples, porosity can enhance magnetic flux trapping.

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Держатели документа:
Kirensky Institute of Physics, Krasnoyarsk Scientific Center, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, Russia

Доп.точки доступа:
Гохфельд, Денис Михайлович
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Phases, microstructure and magnetic properties in a severely deformed Cr-Ni–Al alloy / L. I. Kveglis, D. E. Yerbolatuly, F. M. Noskov [et al.] // J. Supercond. Nov. Magn. - 2023. - Vol. 36, Is. 4. - P. 1249-1255, DOI 10.1007/s10948-023-06567-8. - Cited References: 22. - The authors express their gratitude to Nurgamit Kantay (East-Kazakhstan University named after S. Amanzholov) for his help in conducting the experiment . - ISSN 1557-1939. - ISSN 1557-1947
Кл.слова (ненормированные):
Nickel–chromium alloy -- Coercive force -- Magnetic anisotropy -- Super-plasticity -- Intermetallic phases
Аннотация: The phases, microstructure, and magnetic properties in a severely deformed Cr-Ni–Al alloy have been studied. The eutectic microstructure observed in localized regions of the alloy can be interpreted as a result from the super-Arrhenius relaxation of the alloy. According to X-ray diffraction and magnetometry, the nanosized nickel inclusions in the matrix of the chromium-nickel γ-solid solution are formed. It is shown that, after severe (superplastic) deformation, a unidirectional magnetic anisotropy is induced, which may be associated with the antiferromagnetic coupling between the CrNi2 matrix and the nickel inclusions.

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Держатели документа:
Siberian Federal University, Krasnoyarsk, Russia
East Kazakhstan University named after S. Amanzholov, Ust-Kamenogorsk, Kazakhstan
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, Russia

Доп.точки доступа:
Kveglis, Ludmila I.; Yerbolatuly, Dosym E.; Noskov, Fedor M.; Komogortsev, S. V.; Комогорцев, Сергей Викторович; Volochaev, M. N.; Волочаев, Михаил Николаевич
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Short note on the observation of ambient condition room temperature superconductivity in nitrogen-doped lutetium hydride / V. P. S. Awana, I. Felner, S. Ovchinnikov, J. W. A. Robinson // J. Supercond. Nov. Magn. - 2023. - Vol. 36, Is. 4. - P. 1085-1086, DOI 10.1007/s10948-023-06563-y. - Cited References: 21 . - ISSN 1557-1939. - ISSN 1557-1947

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Держатели документа:
CSIR-NPL, New Delhi, 110012, India
The Hebrew University, 91904, Jerusalem, Israel
Kirensky Institute of Physics, Krasnoyarsk, 660036, Russia
University of Cambridge, 27 Charles Babbage Road, Cambridge, UK

Доп.точки доступа:
Awana, V. P. S.; Felner, Israel; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Robinson, Jason W. A.
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Anisotropy and crystallite misalignment in textured superconductors / D. M. Gokhfeld, S. V. Semenov, M. I. Petrov [et al.] // J. Supercond. Nov. Magn. - 2023. - Vol. 36, Is. 1. - P. 59-65, DOI 10.1007/s10948-022-06454-8. - Cited References: 21. - This work was supported by the Russian Foundation for Basic Research and the Government of the Krasnoyarsk Territory, Krasnoyarsk Territorial Foundation for Support of Scientific and R&D Activities, project “Superconducting properties of YBCO incorporated by paramagnetic rare-earth elements” No. 20–42–240008 . - ISSN 1557-1939. - ISSN 1557-1947
Кл.слова (ненормированные):
Critical current -- Anizotropy -- BSCCO -- Texture -- Distribution function -- Magnetization -- Hysteresis loop
Аннотация: A misalignment of anisotropic crystallites causes small values of anisotropy and decreases the critical current density of textured polycrystalline superconductors. To relate the crystallite misalignment and out-plane anisotropy, the magnetic properties of the textured Bi2223 polycrystalline superconductor were investigated. A distribution of orientation angles of crystallites was determined using different data: scanning electron microscopy images and hysteresis magnetization loops when an external magnetic field was applied at different angles with respect to the texturing plane of the sample. It was demonstrated that the standard deviation of the distribution and the magnetic disorder angle of crystallites in textured samples can be determined from the magnetization data in perpendicular directions. These data may be either the irreversible magnetization measured for two different orientations of the sample or the simultaneously measured magnetization projections parallel and perpendicular to the magnetic field.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russia
Siberian Federal University, Krasnoyarsk, 660041, Russia
Federal Research Center “Krasnoyarsk Science Center of the Siberian Branch of the Russian Academy of Sciences”, Krasnoyarsk, 660036, Russia

Доп.точки доступа:
Gokhfeld, D. M.; Гохфельд, Денис Михайлович; Semenov, S. V.; Семенов, Сергей Васильевич; Petrov, M. I.; Петров, Михаил Иванович; Nemtsev, I. V.; Немцев, Иван Васильевич; Balaev, D. A.; Балаев, Дмитрий Александрович
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Awana, V. P. S.
New challenges for the Journal of Superconductivity and Novel Magnetism / V. P. S. Awana, I. Felner, S. Ovchinnikov // J. Supercond. Nov. Magn. - 2023. - Vol. 36. - P. 1, DOI 10.1007/s10948-022-06483-3 . - ISSN 1557-1939. - ISSN 1557-1947

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Держатели документа:
National Physical Laboratory, New Delhi, India
The Hebrew University, Jerusalem, Israel
Kirensky Institute of Physics, Krasnoyarsk, Russia

Доп.точки доступа:
Felner, I.; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич
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Awana, V. P. S..
Tributes to the memory of professor Vladimir Z. Kresin / V. P. S. Awana, I. Felner, S. Ovchinnikov // J. Supercond. Nov. Magn. - 2023. - Vol. 36, Is. 6. - P. 1485-1488, DOI 10.1007/s10948-023-06600-w . - ISSN 1557-1939. - ISSN 1557-1947

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Держатели документа:
National Physical Laboratory, New Delhi, India
The Hebrew University, Jerusalem, Israel
Kirensky Institute of Physics, Krasnoyarsk, Russia

Доп.точки доступа:
Felner, Israel; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич
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10.

Balaev, D. A.
Developing a concept of an effective field in the intergrain medium of a granular superconductor: Effect of the intragrain Meissner currents and Abrikosov vortices trapped in grains on the magnetotransport properties of a Y-Ba-Cu-O granular HTS / D. A. Balaev, S. V. Semenov, D. M. Gokhfeld // J. Supercond. Nov. Magn. - 2023. - Vol. 36, Is. 7-9. - P. 1631-1648, DOI 10.1007/s10948-023-06608-2. - Cited References: 58. - The authors are grateful to M.I. Petrov, A.D. Balaev, and V.M. Sosnin for fruitful discussions and A.V. Shabanov and I.V. Nemtsev for scanning electron microscopy investigations. The scanning electron microscopy investigations and a part of magnetic measurements (performed on a LakeShore VSM 8604 facility) were carried out at the Krasnoyarsk Regional Center for Collective Use, Krasnoyarsk Scientific Center, Siberian Branch of the Russian Academy of Sciences. The study is performed within the state assignment of Kirensky Institute of Physics . - ISSN 1557-1939. - ISSN 1557-1947
Кл.слова (ненормированные):
Granular HTS -- Effective field in the intergrain medium -- Magnetoresistance hysteresis -- Magnetization hysteresis -- Trapped flux -- Meissner current -- Abrikosov vortex
Аннотация: Granular high-temperature superconductors (HTSs) are characterized by the hysteretic field dependences of magnetoresistance R(H) and critical current IC(H). These hysteretic effects are described within the concept of an effective field in the intergrain medium. The effective field is a superposition of external magnetic field H and the field induced by the magnetic moments of superconducting grains into intergrain spacings (grain boundaries). The magnetization of superconducting grains is determined by two contributions: Meissner (shielding) currents (MC) and trapped magnetic fluxes (Abrikosov vortices (AV)). To develop the concept of an effective field in the intergrain medium, the magnetotransport properties (R and IC) have been compared for two cases: (AV) the magnetization of superconducting grains is only determined by the trapped magnetic flux (zero external field) and (MC) HTS grains are in the Meissner state (the external field is weaker than the first critical field of grains). In a set of experiments, the main features of the hysteretic R(H) and M(H) dependences have been illustrated and the external conditions for implementing the AV and MC states have been established. It has been found that the effects of the Abrikosov vortices and intragrain Meissner currents on an effective field in the intergrain medium at the same magnetization values are noticeably different. This is a nontrivial fact that requires a thorough study of the impact of the anisotropy of the superconducting properties of grains on the configuration of the Meissner currents in them, as well as on the orientation of vortices both inside grains and near their surface. We suggest the explanation of observed stronger effect of the Meissner currents on the intergrain medium as compared with the effect of the Abrikosov vortices.

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Держатели документа:
Kirensky Institute of Physics, Krasnoyarsk Scientific Center, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, 660036, Russia

Доп.точки доступа:
Semenov, S. V.; Семёнов, Сергей Васильевич; Gokhfeld, D. M.; Гохфельд, Денис Михайлович; Балаев, Дмитрий Александрович
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