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    Dual band HTSC power limiter / A. O. Afonin, A. A. Alexandrovsky, I. V. Govorun [et al.] // J. Sib. Fed. Univ. Math. Phys. - 2024. - Vol. 17, Is. 2. - P. 162-168 ; Журн. СФУ. Матем. и физ. - Cited References: 10 . - ISSN 1997-1397
   Перевод заглавия: ВТСП ограничитель мощности с двумя рабочими полосами
Кл.слова (ненормированные):
power limiter -- microwave -- HTSC -- microstrip structure -- ограничитель мощности -- СВЧ -- ВТСП -- микрополосковая структура
Аннотация: A new construction of dual band HTSC power limiter is proposed. The device consists of two microstrip bandpass filters. Each filter consists of two quarter-wave resonators which couple through a composite half-wave resonator with HTSC-element. The prototype of the device in the open mode has operation passband of about 10% and 11% with central frequency being equal to 1.48 GHz and 2.03 GHz, the minimum loss in the passband is equal 1.9 dB and 1.7 dB for LF-channel and HF-channel correspondingly. The transfer characteristics of the device were investigated in the case of microwave power level up to 3.15 W.
Предложена новая конструкция ВТСП ограничителя мощности с двумя рабочими полосами. Ограничитель содержит два микрополосковых полосно-пропускающих фильтра. Каждый фильтр состоит из двух четвертьволновых резонаторов, которые связаны между собой через составной полуволновый резонатор, содержащий пленку из высокотемпературного сверхпроводника. Макет устройства в открытом режиме имеет ширины рабочих полос пропускания 10% и 11% с центральными частотами 1.48 ГГц и 2.03 ГГц. Минимальные вносимые потери составили 1.9 дБ и 1.7 дБ для НЧ- и ВЧ-каналов соответственно. Передаточные характеристики устройства были исследованы до уровня СВЧ-мощности 3.15 Вт.

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Держатели документа:
Kirensky Institute of Physics SB RAS, Krasnoyarsk, Russian Federation
Reshetnev Siberian State University of Science and Technology, Krasnoyarsk, Russian Federation
Siberian Federal University, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Afonin, A. O.; Афонин, Алексей Олегович; Alexandrovsky, A. S.; Александровский, Александр Сергеевич; Govorun, I. V.; Говорун, Илья Валерьевич; Leksikov, A. A.; Лексиков, Александр Александрович; Ugryumov, A. V.; Угрюмов, Андрей Витальевич; Ogorodnikov, D. K.

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Temperature and dimensional dependence of the irreversibility field of a layered high-temperature superconductor / A. A. Mikhailov, A. N. Maksimova, A. N. Moroz, D. M. Gokhfeld // Phys. At. Nucl. - 2022. - Vol. 85, Is. 10. - P. 1652-1657, DOI 10.1134/S1063778822100398. - Cited References: 23. - The work was supported by the “Prioritet-2030” program of National Research Nuclear University MEPhI . - ISSN 1063-7788. - ISSN 1562-692X
Кл.слова (ненормированные):
granulated HTSC -- Monte Carlo method -- irreversibility field -- relaxation of residual magnetization
Аннотация: The Monte Carlo method was used in a 2D model of the layered HTSC to calculate the magnetization curves of a granulated high-temperature superconductor for various sizes of granules. In this approach magnetization of granules alone is taken into account, while the contribution of the gaps between granules is small and neglected. The irreversibility field has been found to decrease with temperature at the fixed size of granules and increase as the granule size increases at fixed temperature. The time dependence of residual magnetization has been studied at various temperatures. The relaxation rate is shown not to depend on the granule size at low temperatures but to decrease with the increasing size (provided that the granule size is less than 3 μm) at a high temperature when the magnetic flux creep becomes of importance.

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Публикация на русском языке Температурная и размерная зависимость поля необратимости слоистого высокотемпературного сверхпроводника [Текст] / А. А. Михайлов, А. Н. Максимова, А. Н. Мороз, Д. М. Гохфельд. - 6 с. // Яд. физ. и инжиниринг. - 2024. - Т. 14 № 4. - С. 339-344

Держатели документа:
National Research Nuclear University MEPhI (Moscow Engineering Physics Institute), 115409, Moscow, Russia
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, 660036, Krasnoyarsk, Russia

Доп.точки доступа:
Mikhailov, A. A.; Maksimova, A. N.; Moroz, A. N.; Gokhfeld, D. M.; Гохфельд, Денис Михайлович
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Balaev, D. A.
Influence of intragranular Meissner currents and magnetic flux trapped in granules on the effective field in the intergranular medium and the magnetoresistance hysteresis of a granular HTSC / D. A. Balaev, S. V. Semenov, D. M. Gokhfeld // Phys. Solid State. - 2022. - Vol. 64, Is. 12. - P. 1846-1854, DOI 10.21883/PSS.2022.12.54376.442. - Cited References: 61. - The study was carried out with the financial support of the Russian Foundation for Basic Research, the Government of the Krasnoyarsk Territory, the Krasnoyarsk areal Science Foundation within the framework of the scientific project No. 20-42-240008 ”The effect of the introduction of paramagnetic ions of rare earth elements on the superconducting properties of materials based on YBCO“. The study of the microstructure and magnetic measurements were carried out using the equipment of the Center for Collective Use of the FITC KNC SB RAS . - ISSN 1063-7834. - ISSN 1090-6460
Кл.слова (ненормированные):
granular HTSC -- magnetoresistance hysteresis -- magnetization hysteresis -- trapped flux -- screening currents
Аннотация: The concept of an effective field in an intergranular medium is used to describe the hysteresis magnetoresistance of granular HTSCs. This effective field is a superposition of the external magnetic field and the field induced by the magnetic moments of the superconducting granules. The magnetic moment of the granules is contributed by the shielding currents and the trapped magnetic flux. We studied and analyzed the effect of the trapped flux on the magnetoresistance. It has been experimentally shown that the dependence of the residual resistance RRem (after applying of the external field) on the trapped flux clearly correlates with the behavior of the remanent magnetization. In addition, special attention was paid to a detailed comparison of the magnetoresistance of the granular YBa2Cu3O7-δ for two cases: (a) the magnetization of HTSC-granules is caused only by the trapped magnetic flux (in a zero external field) and (b) HTSC-granules are in the Meissner state (the external field is smaller than the first critical field of the granules). It has been found that Abrikosov vortices and intragranular Meissner currents differently affect the effective field in the intergranular medium (for the same values (of magnetization for cases (a) and (b) ). A possible reason for this difference is discussed.

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Публикация на русском языке Балаев, Дмитрий Александрович. Влияние внутригранульных мейсснеровских токов и захваченного в гранулах потока на эффективное поле в межгранульной среде и гистерезис магнитосопротивления гранулярного ВТСП [Текст] / Д. А. Балаев, С. В. Семенов, Д. М. Гохфельд // Физ. тверд. тела. - 2022. - Т. 64 Вып. 12. - С. 1882-1890

Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB, Russian Academy of Sciences, Krasnoyarsk, Russia

Доп.точки доступа:
Semenov, S. V.; Семёнов, Сергей Васильевич; Gokhfeld, D. M.; Гохфельд, Денис Михайлович; Балаев, Дмитрий Александрович
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    Makarov, I. A.
    Enhanced s*-wave component of the superconducting gap in overdoped HTSC cuprates with orthorhombic distortion / I. A. Makarov, S. G. Ovchinnikov // Phys. Lett. A. - 2022. - Vol. 444. - Ст. 128226, DOI 10.1016/j.physleta.2022.128226. - Cited References: 67. - We would like to especially thank A. Bianconi for new ideas, useful discussions, and suggestions. The reported study was funded by Russian Foundation for Basic Research, Government of Krasnoyarsk Territory and Krasnoyarsk Regional Fund of Science according to the research project “Studies of superexchange and electron-phonon interactions in correlated systems as a basis for searching for promising functional materials” No. 20-42-240016 . - ISSN 0375-9601
   Перевод заглавия: Увеличенная s*-волновая компонента сверхпроводящей щели в передопированных ВТСП купратах с орторомбическим искажением
Кл.слова (ненормированные):
High-Tc superconductors -- Orthorhombic cuprates -- Hubbard model -- Superconductivity theory -- Fermi contour -- Superconducting gap symmetry
Аннотация: In this work, the concentration and temperature dependence of the superconducting gap of the HTSC cuprate in the orthorhombic phase are obtained within the framework of the Hubbard model taking into account the exchange mechanism of pairing. To elucidate the reasons for the unexpectedly large s*-wave component of the superconducting gap in the overdoped regime, the electronic structure of low-energy excitations and the k-dependent contributions of pair states to the gap components were investigated. It is shown that the s*-wave component growth results from the shallowing of the electron pocket in the region of the s*-wave component maximum.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Akademgorodok 50, bld. 38, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Макаров, Илья Анатольевич
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Gavrichkov, V. A.
Superexchange in 2D perovskite HTSC with stripe nanostructure / V. A. Gavrichkov // International conference "Functional materials" : book of abstracts / ed. V. N. Berzhansky ; org. com. S. G. Ovchinnikov [et al.]. - Simferopol, 2021. - P. 223-2224. - Библиогр.: 3 назв. - The reported study was supported by the grant RFFI 19-02-00034 and the Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, and Krasnoyarsk Regional Fund of Science according to the research project ”Studies of superexchange and electron-phonon interactions in correlated systems as a basis for searching for promising functional materials No. 20-42-240016.

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Доп.точки доступа:
Berzhansky, V. N. \ed.\; Бержанский, Владимир Наумович; Ovchinnikov, S. G. \org. com.\; Овчинников, Сергей Геннадьевич; Гавричков, Владимир Александрович; "Functional materials", International conference(2021 ; Oct. 4-8 ; Alushta, Russia); Крымский федеральный университет имени В.И. Вернадского
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Kuz'min, V. I.
Effect of short-range correlations on spectral properties of doped Mott insulators / V. Kuz’min, S. Nikolaev, S. Ovchinnikov // J. Supercond. Novel Magn. - 2019. - Vol. 32, Is. 7. - P. 1909-1919, DOI 10.1007/s10948-018-4927-x. - Cited References: 81. - The reported study was funded by RFBR according to the research project no. 18-32-00256 (all the results except correlation functions calculated using 4 × 4 clusters). The study also was funded by the Presidium RAS program no. 12 “Fundamental problems of high temperature superconductivity” (research project 0356-2018-0063); “BASIS” Foundation for Development of Theoretical Physics and Mathematics; RFBR according to the research project no. 16-02-00098; RFBR and Government of Krasnoyarsk Territory, Krasnoyarsk Regional Fund of Science, the research project: “18-42-240017 Features of electron-phonon coupling in high-temperature superconductors with strong electron correlations” and the research project 18-42-243004. . - ISSN 1557-1939
Кл.слова (ненормированные):
The Hubbard model -- The Hubbard-Holstein model -- HTSC -- Cluster perturbation theories -- Fermi surface -- Spectral properties
Аннотация: In the framework of the cluster perturbation theory for the 2D Hubbard and Hubbard-Holstein models at low hole doping, we have studied the effect of local and short-range correlations in strongly correlated systems on the anomalous features in the electronic spectrum by investigating the fine structure of quasiparticle bands. Different anomalous features of spectrum are obtained as the result of intrinsic properties of strongly correlated electron and polaron bands in the presence of short-range correlations. Particularly, features similar to the electron-like Fermi-pockets of cuprates at hole doping p ∼ 0.1 are obtained without ad hoc introducing a charge density wave order parameter within the Hubbard model in a unified manner with other known peculiarities of the pseudogap phase like Fermi-arcs, pockets, waterfalls, and kink-like features. The Fermi surface is mainly formed by dispersive quasiparticle bands with large spectral weight, formed by coherent low-energy exications. Within the Hubbard-Holstein model at moderate phonon frequencies, we show that modest values of local electron-phonon interaction are capable of introducing low-energy kink-like features and affecting the Fermi surface by hybridization of the fermionic quasiparticle bands with the Franck-Condon resonances.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation
Siberian Federal University, Krasnoyarsk, 660041, Russian Federation

Доп.точки доступа:
Nikolaev, S. V.; Николаев, Сергей Викторович; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Кузьмин, Валерий Ипполитович
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Semenov, S. V.
Magnetoresistance Hysteresis Evolution in the Granular Y–Ba–Cu–O High-Temperature Superconductor in a Wide Temperature Range / S. V. Semenov, D. A. Balaev // J. Supercond. Novel Magn. - 2019. - Vol. 32, Is. 8. - P. 2409–2419, DOI 10.1007/s10948-019-5043-2. - Cited References: 55. - The work was supported by the Russian Science Foundation (Grant No. 17-72-10050). . - ISSN 1557-1939
Кл.слова (ненормированные):
Granular HTSC -- YBCO -- Magnetoresistance hysteresis -- Effective field -- Intergrain medium -- Magnetic flux compression
Аннотация: The temperature evolution of the magnetoresistance hysteresis in the granular YBa2Cu3O7-δ high-temperature (TC ≈ 92 K) superconductor has been investigated. The measurements have been performed in the high-temperature region (78–90 K) and at the liquid helium temperature (4.2 K). The results obtained have been analyzed using the developed model of the behavior of transport properties of a granular high-temperature superconductor in an external magnetic field. Within the discussed model, the dissipation of the grain boundary subsystem is determined by the intergrain spacing-averaged effective field Beff, which is a superposition of external field H and the field induced by the magnetic moments of superconducting grains. Such a consideration yields the expression Beff(H) = H − 4πM(H) α for the effective field in the intergrain medium, where M(H) is the experimental hysteretic dependence of magnetization and α is the parameter of magnetic flux crowding in the intergrain medium. Here, the magnetoresistance is assumed to be proportional to the absolute value of the effective field: R(H) ~ |Beff(H)|. Analysis of the experimental R(H) and M(H) dependences obtained under the same conditions for the investigated high-temperature superconductor sample showed that in the high-temperature region this parameter is α ≈ 25. At the low temperature (4.2 K), we may state that the degree of flux crowding increases and the estimated α value is ~ 50. The estimates made are indicative of the strong effect of flux compression in the intergrain medium on the magnetotransport properties of the investigated granular high-temperature superconductor system. Possible reasons for a discrepancy between the developed model concepts and experimentally observed low-temperature R(H) hysteresis are analyzed.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Balaev, D. A.; Балаев, Дмитрий Александрович; Семёнов, Сергей Васильевич
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    Govorun, I. V.
    Compact microwave power limiter with htsc element / I. V. Govorun, A. A. Leksikov, A. M. Serzhantov // J. Sib. Fed. Univ. Math. Phys. - 2018. - Vol. 11, Is. 1. - P. 35-39 ; Журн. СФУ. Сер. "Математика и физика", DOI 10.17516/1997-1397-2018-11-1-35-39. - Cited References: 9. - The work was supported by the Ministry of Education and Science of the Russian Federation, grant СП-3036.2016.3. of the President of the Russian Federation for State Support of Young Russian Scientists. . - ISSN 1997-1397
   Перевод заглавия: Компактный ограничитель СВЧ-мощности с ВТСП-элементом
Кл.слова (ненормированные):
Power limiter -- Microwave -- Damping pole -- Microstripe structure -- HTSC -- ограничитель мощности -- СВЧ -- полюс затухания -- микрополосковая структура -- ВТСП
Аннотация: A design of microwave power limiter having a structure of three-pole microstrip filter is developed. In the device outer resonators are coupled through an inner resonator containing high-temperature super- conducting film. Prototype of the device with central frequency 7.9 GHz and relative bandwidth 9% has insertion loss 1.5 dB in the open state and suppress a signal not less 30 dB in the limitation state.
Была разработана конструкция ограничителя СВЧ-мощности, имеющая структуру трехзвенного микрополоскового фильтра. В устройстве внешние резонаторы связаны посредством внутреннего, содержащего ВТСП-пленку. Макет устройства с центральной частотой 7.9 ГГц и относительной полосой пропускания 9% имеет потери 1.5 дБ в открытом состоянии и не менее 30 дБ ослабления в режиме ограничения.

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Держатели документа:
Kirensky Institute of Physics SB RAS, Akademgorodok, 50, Krasnoyarsk, Russian Federation
Institute of Engineering Physics and Radio Electronics, Siberian Federal University, Svobodny, 79, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Leksikov, A. A.; Лексиков, Александр Александрович; Serzhantov, A. M.; Сержантов, Алексей Михайлович; Говорун, Илья Валерьевич

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Reflective power limiter for X-band with HTSC switching element / B. A. Belyaev [et al.] // IEEE Trans. Appl. Supercond. - 2016. - Vol. 26, Is. 6. - Ст. 1500506, DOI 10.1109/TASC.2016.2530700. - Cited References:23 . - ISSN 1051-8223. - ISSN 1558-2515

РУБ Engineering, Electrical & Electronic + Physics, Applied
Рубрики:
Superconducting transmission-line
Кл.слова (ненормированные):
Microstrip structure -- microwave (MW) -- power limiter (PL) -- transmission -- zero
Аннотация: This paper presents a new type of power limiter (PL), using superconducting-to-normal state phase transition in high-temperature superconductor. The presented device differs from the existing ones mainly in the reflective principle of its operation. In fact, the PL is a three-resonator microstrip filter, whose resonators are configured and arranged in such a manner that coupling coefficient between the outer resonators is equal to zero and the inner one has a gap in the middle section shunted by a high-temperature superconducting (HTS) film element. In small-signal mode, the HTS element is in low-loss state, and the device is essentially a three-pole filter with low transmission loss. When the level of the signal exceeds the threshold, the HTS element transits to the high-loss state, and the Q-factor of the inner resonator falls, breaking the coupling in the structure. This leads to the corresponding increase in the PL's transmission loss due to reflection. The higher the level of incoming power, the more the Q-factor falls. The PL operating frequency is 8 GHz with 8.5% fractional bandwidth. It remains operable up to 40 W of input power, providing 38-dB limitation.

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Держатели документа:
Russian Acad Sci, Kirensky Inst Phys, Siberian Branch, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Krasnoyarsk 660074, Russia.

Доп.точки доступа:
Belyaev, B. A.; Беляев, Борис Афанасьевич; Govorun, I. V.; Говорун, Илья Валерьевич; Leksikov, Al. A.; Лексиков, Александр Александрович; Serzhantov, A. M.; Сержантов, Алексей Михайлович; Leksikov, An. A.; Лексиков, Андрей Александрович
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10.

Kozlov, P. A.
Transition Between Large and Small Polaron States in the Electronic Structure of HTSC Cuprates / P. A. Kozlov, I. A. Makarov, S. G. Ovchinnikov // VI Euro-Asian Symposium "Trends in MAGnetism" (EASTMAG-2016) : abstracts / ed.: O. A. Maksimova, R. D. Ivantsov. - Krasnoyarsk : KIP RAS SB, 2016. - Ст. P2.11. - P. 153. - References: 3 . - ISBN 978-5-904603-06-9
Кл.слова (ненормированные):
cuprates -- strong electron correlations -- electron-phonon interaction -- polaron -- Franck-Condon

Доп.точки доступа:
Makarov, I. A.; Макаров, Илья Анатольевич; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Козлов, Пётр Александрович; Euro-Asian Symposium "Trends in MAGnetism"(6 ; 2016 ; Aug. ; 15-19 ; Krasnoyarsk); "Trends in MAGnetism", Euro-Asian Symposium(6 ; 2016 ; Aug. ; 15-19 ; Krasnoyarsk); Институт физики им. Л.В. Киренского Сибирского отделения РАН

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