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A new concept for a current switch based on a high-temperature superconductor / S. G. Ovchinnikov [et al.] // Tech. Phys. - 2001. - Vol. 46, Is. 10. - P. 1299-1302, DOI 10.1134/1.1412067. - Cited References: 14 . - ISSN 1063-7842

РУБ Physics, Applied
Рубрики:
CURRENT LIMITER
Аннотация: A new concept for a device for protecting an alternating-current network is offered. It is based on a combination of a superconducting limiter of a short-circuit current and a circuit breaker. A high-temperature superconductor in the form of a pile of plane rings is used as the active element of the limiter. The test results of a model of such a limiter are obtained in the steady-state short-circuit regime. The characteristics of composite silverless materials used for design of the breaker are given. (C) 2001 MAIK "Nauka/Interperiodica".

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Держатели документа:
Russian Acad Sci, Siberian Div, LV Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
Krasnoyarsk State Univ, Res Physicotech Inst, Krasnoyarsk 660036, Russia
Natl Tech Univ Athens, GR-10682 Athens, Greece
ИФ СО РАН
L. V. Kirenskii Inst. of Phys., Siberian Division, Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation
Research Physicotechnical Institute, Krasnoyarsk State University, Krasnoyarsk, 660036, Russian Federation
Natl. Technical University of Athens, 10682 Athens, Greece

Доп.точки доступа:
Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Kirko, V. I.; Mamalis, A. G.; Petrov, M. I.; Петров, Михаил Иванович; Ivanov, V. V.; Balaev, D. A.; Балаев, Дмитрий Александрович; Gokhfel'd, D. M.; Гохфельд, Денис Михайлович; Kharlamova, S. A.; Militsyn, S. V.; Shaikhutdinov, K. A.; Шайхутдинов, Кирилл Александрович
}
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Gokhfeld, D. M.
An extended critical state model: Asymmetric magnetization loops and field dependence of the critical current of superconductors / D. M. Gokhfeld // Phys. Solid State. - 2014. - Vol. 56, Is. 12. - P. 2380-2386, DOI 10.1134/S1063783414120129. - Cited References: 37 . - ISSN 1063-7834. - ISSN 1090-6460

РУБ Physics, Condensed Matter
Рубрики:
CRITICAL-CURRENT DENSITY
   HIGH-TEMPERATURE SUPERCONDUCTORS
   II SUPERCONDUCTORS
   SURFACE-BARRIER
   MGB2
   TRANSPORT
   MOTION
   J(C)
   PEAK
Аннотация: An extended critical state model has been developed. The model has considered the equilibrium magnetization of a surface layer and the magnetization of the central region of a superconducting sample. The magnetic flux distributions in the sample have been calculated. An analytical dependence of the critical current density on the magnetic field with different behaviors in strong and weak fields has been proposed. A relation of the asymmetry of the magnetization loops and the critical current density to the sample size has been established. The model is applicable to the parameterization of magnetization loops of single-crystal and polycrystalline superconductors.

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Публикация на русском языке Гохфельд, Денис Михайлович. Расширенная модель критического состояния: асимметричные петли намагниченности и полевые зависимости критического тока сверхпроводников [Текст] / Д. М. Гохфельд // Физ. тверд. тела : Физико-технический институт им. А. Ф. Иоффе РАН, 2014. - Т. 56 Вып. 12. - С. 2298-2304

Доп.точки доступа:
Гохфельд, Денис Михайлович
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    Gokhfeld, D. M.
    Analog of the intertype superconductivity in nanostructured materials / D. M. Gokhfeld, S. I. Popkov, A. A. Bykov // Physica C. - 2019. - Vol. 566. - Ст. 1353526, DOI 10.1016/j.physc.2019.1353526. - Cited References: 21. - The authors are grateful to D.A. Balaev, N.E. Savitskaya, N.A. Grigorieva for fruitful discussions and to A.A. Mistonov for provided samples. The work is supported by the Russian Science Foundation (project no. 17-72-10067 ). . - ISSN 0921-4534
   Перевод заглавия: Аналог межтиповой сверхпроводимости в наноструктуированных материалах
Кл.слова (ненормированные):
Tin-based inverse opal -- Intertype superconductivity -- Nanostructures
Аннотация: Magnetization hysteresis loops of tin samples with an inverted opal structure are presented. The sample formed by tin particles with the size of 70 and 128 nm is found to be a type-I superconductor. The tin sample formed by 80 and 42 nm particles demonstrates an analog of intertype superconductivity: features of both type-I and II superconductors are observed on the magnetization isothermal curves. A behavior of the irreversible and reversible magnetizations supports coexistence of type-I and II superconducting nanoparticles in this sample.

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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
NRC «Kurchatov Institute» - PNPI, Gatchina, 188300, Russian Federation

Доп.точки доступа:
Popkov, S. I.; Попков, Сергей Иванович; Bykov, A. A.; Гохфельд, Денис Михайлович
}
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    Analysis of magnetization loops of electrospun nonwoven superconducting fabrics / X. L. Zeng [et al.] // Phys. Rev. Materials. - 2017. - Vol. 1, No. 4. - Ст. 044802, DOI 10.1103/PhysRevMaterials.1.044802. - Cited References: 55. - We thank Prof. V. Presser (INM Saarbrücken and Saarland University) for the opportunity to use the electrospinning apparatus, and J. Schmauch (Saarland University, Prof. Birringer’s group) for technical assistance. The collaboration UdS-Nancy was supported by the EU-INTERREG IVa, project “Greater Region Magnetism Network (GRMN)”. This work was supported by the Volkswagen Foundation. . - ISSN 2475-9953
   Перевод заглавия: Анализ петель намагниченности сверхпроводящих полотен, полученных электроспиннингом
Аннотация: Networks of superconducting Bi2Sr2CaCu2O8 (Bi-2212) nanowires were fabricated by the electrospinning technique. The nanowires have a diameter of the order of 150–200 nm and lengths up to the micrometer range and form a nonwoven, fabric-like network with numerous interconnections enabling a current flow between the nanowires. The porosity of this nanowire network is 0.9928. Therefore, this material represents a novel class of ultraporous high-temperature superconductors. The magnetizations of the nanowire networks [M(T) and M(H)] were recorded by SQUID magnetometry. The magnetic properties were analyzed using the extended critical state model (ECSM). It is supposed that the averaged diameter of the nanowires rules the magnetic field dependence of the critical current density of the nanowire network. Single nanowires have remarkably high values of the critical current density of 1.04×107A/cm2 at 5 K. The macroscopic critical current density less than ∼0.05A/cm2 at 5 K is fine for this lightweight material. Using ECSM, several important magnetic parameters could be determined including the penetration field Hp, the irreversibility fields Hirr, the upper critical field Hc2, and the flux pinning forces. Applications for this material class may be found in the direction of sensors, thin shielding layers, or nanoporous bulks.

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Держатели документа:
Institute of Experimental Physics, Saarland University, Campus C 6 3, 66123 Saarbrücken, Germany
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Akademgorodok 50/38, Krasnoyarsk 660036, Russia
Institut Jean Lamour, UMR CNRS-Université de Lorraine, 54506 Vandœvre-lès-Nancy, France

Доп.точки доступа:
Zeng, Xian Lin; Karwoth, Thomas; Koblischka,, Michael R.; Hartmann, Uwe; Gokhfeld, D. M.; Гохфельд, Денис Михайлович; Chang, Crosby; Hauet, Thomas
}
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    Gokhfeld, D. M.
    Analysis of superconductor magnetization hysteresis / D. M. Gokhfeld // J. Sib. Fed. Univ. Math. Phys. - 2018. - Vol. 11, Is. 2. - P. 219-221 ; Журн. СФУ. Сер. "Математика и физика", DOI 10.17516/1997-1397-2018-11-2-219-221. - Cited References: 9 . - ISSN 1997-1397
   Перевод заглавия: Анализ петель намагниченности сверхпроводников
Кл.слова (ненормированные):
Pinning -- Abrikosov vortices -- Critical state -- Critical current density -- Trapped flux -- пиннинг -- вихри Абрикосова -- критическое состояние -- плотность критического тока -- захваченное поле
Аннотация: The critical state model and the extended critical state model are described to analyse a magnetization hysteresis and to find superconductor parameters. We discuss how geometric sizes and form influence on magnetization hysteresis, critical current and trapped flux.
Описано использование модели критического состояния и расширенной модели критического состояния для определения параметров сверхпроводников из измеренных петель намагниченности. Обсуждается влияние геометрических размеров и формы образцов на вид петель намагниченности, критический ток и замороженное магнитное поле.

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

Доп.точки доступа:
Гохфельд, Денис Михайлович

}
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Petrov, M. I.
Andreev reflection and experimental temperature dependences of the critical current in heterogeneous high-temperature superconductors (polycrystals and related composites) / M. I. Petrov, D. A. Balaev, D. M. Gokhfeld // Phys. Solid State. - 2007. - Vol. 49, Is. 4. - P. 619-626, DOI 10.1134/S106378340704004X. - Cited References: 41 . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
CURRENT-VOLTAGE CHARACTERISTICS
   NORMAL-METAL
   WEAK LINKS
   JOSEPHSON-JUNCTIONS
   MODEL
   SCATTERING
   TRANSPORT
   DISSIPATION
   HYSTERESIS
Аннотация: The temperature dependences of the critical current of Y3/4Lu1/4Ba2Cu3O7 polycrystalline high-temperature superconductors subjected to annealing for different times and those of Y3/4Lu1/4Ba2Cu3O7 + BaPbO3 composites were measured. The results obtained were analyzed in terms of the Gunsenheimer-Schussler-Kummler theory considering the Andreev reflection of carriers in a "superconductor-normal metal-superconductor" (S-N-S) junction. Good agreement between the experimental and theoretical temperature dependences of the critical current over a wide temperature range for polycrystals with both natural and artificially created boundaries (composites) made it possible to estimate the effective length of grain boundaries in the high-temperature superconductors. It was revealed that the critical current density measured at 4.2 K is an exponential function of the length of grain boundaries in samples of both types.

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Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Div, Krasnoyarsk 660036, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Division, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Balaev, D. A.; Балаев, Дмитрий Александрович; Gokhfeld, D. M.; Гохфельд, Денис Михайлович; Петров, Михаил Иванович
}
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Andreev reflection in natural grain boundaries of polycrystalline high-T-c superconductor La1.85Sr0.15CuO4 / M. I. Petrov [et al.] // Phys. Solid State. - 2003. - Vol. 45, Is. 7. - P. 1219-1222, DOI 10.1134/1.1594233. - Cited References: 30 . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
CURRENT-VOLTAGE CHARACTERISTICS
   WEAK LINKS
   CHARGE-TRANSPORT
   JUNCTIONS
   CONDUCTIVITY
   HYSTERESIS
   COMPOSITES
   SCATTERING
Аннотация: The temperature evolution of the current-voltage characteristic (CVC) of a "break junction" with metal-type conductivity on the polycrystalline La1.85Sr0.15CuO4 high-temperature superconductor is investigated. The CVC exhibits gap peculiarities and hysteresis, which is observed in the region of negative differential resistance. The experimental results are described well in terms of the Kummel-Gunsenheimer-Nicolsky theory for an S-N-S junction (S is a superconductor, N is a normal metal) this theory takes into account multiple Andreev reflection of quasiparticles. It is shown that the shape of the CVC and the existence and the shape of hysteresis are determined by the ratio of "long" and "short" grain boundaries in the polycrystal under investigation. (C) 2003 MAIK "Nauka / Interperiodica".

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Держатели документа:
Russian Acad Sci, Siberian Div, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
Reshetnev Siberian State Aerosp Univ, Krasnoyarsk 660014, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Division, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk 660036, Russian Federation
Reshetnev Siberian Stt. Aerosp. U., Krasnoyarsk 660014, Russian Federation

Доп.точки доступа:
Petrov, M. I.; Петров, Михаил Иванович; Balaev, D. A.; Балаев, Дмитрий Александрович; Gokhfel'd, D. M.; Гохфельд, Денис Михайлович; Shaikhutdinov, K. A.; Шайхутдинов, Кирилл Александрович
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Andreev reflections and experimental current-voltage characteristics of break junctions of polycrystalline HTSC / M. I. Petrov [et al.] // Physica C. - 2004. - Vol. 408: 7th International Conference on Materials and Mechanisms of Superconductive and High Temperature Superconductors (MAY 25-30, 2003, Rio de Janeiro, BRAZIL). - P. 620-622, DOI 10.1016/j.physc.2004.03.085. - Cited References: 3 . - ISSN 0921-4534

РУБ Physics, Applied

Кл.слова (ненормированные):
Andreev reflections -- break junction -- current-voltage characteristics -- Andreev reflections -- Break junction -- Current-voltage characteristics -- Andreev reflections -- Break junctions -- Elastic scattering -- Lattice defects -- Negative differential resistance -- Electric fields -- Heuristic methods -- Hysteresis -- Microcracks -- Polycrystalline materials -- Probability density function -- Quasicrystals -- Superconducting materials -- Yttrium barium copper oxides -- Current voltage characteristics
Аннотация: The temperature evolution of current-voltage characteristics (CVCs) of break junctions made from polycrystalline Y0.75Lu0.25Ba2Cu3O7 and La1.85Sr0.15CuO4 is investigated. The experimental CVCs have hysteretic features that reflect a part of a curve with negative differential resistance. The temperature evolution of the CVCs is discussed within the framework of the Kummel-Gunsenheimer-Nicolsky theory for superconductor/normal-metal/superconductor junctions considering multiple Andreev reflections. It is shown that the shape of the CVCs of break junctions is determined by the ratio of the number of "short" and "long" intergrain normal regions in the polycrystalline HTSC under investigation. (C) 2004 Elsevier B.V. All rights reserved.

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Держатели документа:
LV Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
Reshetnev Siberian State Aerosp Univ, Krasnoyarsk 660014, Russia
Univ Wurzburg, Inst Theoret Phys & Astrophys, D-97074 Wurzburg, Germany
ИФ СО РАН
Kirensky Intitute of Physics, Akademgorodok, 660036 Krasnoyarsk, Russian Federation
Reshetnev Siberian Stt. Aerosp. U., 660014 Krasnoyarsk, Russian Federation
Inst. fur Theor. Phys./Astrophys., Universitat Wurzburg, D-97074 Wurzburg, Germany

Доп.точки доступа:
Petrov, M. I.; Петров, Михаил Иванович; Gokhfeld, D. M.; Гохфельд, Денис Михайлович; Balaev, D. A.; Балаев, Дмитрий Александрович; Shaihutdinov, K. A.; Kummel, R.
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Anisotropic magnetization of an NbN film / D. M. Gokhfeld, N. E. Savitskaya, S. I. Popkov [et al.] // J. Exp. Theor. Phys. - 2022. - Vol. 134, Is. 6. - P. 707-712, DOI 10.1134/S1063776122060097. - Cited References: 31. - We are grateful to I.V. Nemtsev for measurements on the scanning electron microscope, S.A. Skorobogatov for his help in magnetic measurements (scanning electron microscopy and magnetic measurements have been performed at the Krasnoyarsk Regional Collective Usage Center of the Federal Research Center “Krasnoyarsk Scientific Center, Siberian Branch, Russian Academy of Sciences”) . - ISSN 1063-7761
Кл.слова (ненормированные):
Critical currents -- Magnetization -- Niobium compounds -- Nitrogen compounds -- Reactive sputtering -- Scanning electron microscopy -- Superfluid helium -- Anisotropic magnetization -- Columnar structures -- Field orientation -- Film magnetization -- Film surfaces -- Liquid helium temperature -- Magnetization loops -- Niobium nitride films -- Quartz substrate -- Structural and magnetic properties -- Current density
Аннотация: The structural and magnetic properties of a niobium nitride (NbN) film prepared by reactive sputtering onto a quartz substrate are investigated. It is shown using scanning electron microscopy that the film has a columnar structure with a diameter of crystallite columns of about 50 nm. The film magnetization loops are measured for the field orientation parallel and perpendicular to its surface. Based on the experimental data, the critical current densities of the film are estimated in both cases. For the field parallel to the film surface, the estimate is 6.5 × 104 A/cm2 at the liquid helium temperature. For the field perpendicular to the surface, the critical current density is close to the depairing current density (107 A/cm2). Analysis of the results based on different models of magnetic vortex pinning in superconductors shows that in the former case, pinning occurs at the boundaries of columns in the bulk of the sample, while in the latter case, it is determined by the influence of the surface barrier.

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Публикация на русском языке Анизотропная намагниченность пленки NbN [Текст] / Д. М. Гохфельд, Н. Е. Савицкая, С. И. Попков [и др.] // Журн. эксперим. и теор. физ. - 2022. - Т. 161 Вып. 6. - С. 833-839

Держатели документа:
Kirensky Institute of Physics, Krasnoyarsk Scientific Center, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation
Siberian Federal University, Krasnoyarsk, 660041, Russian Federation
Konstantinov Petersburg Nuclear Physics Institute, Nation Research Center “Kurchatov Institute”, Leningrad oblast, Gatchina, 188300, Russian Federation
Krasnoyarsk Electric Railway-Carriage Repair Works, Krasnoyarsk, 660021, Russian Federation
Mordovia State University, Saransk, 430000, Russian Federation

Доп.точки доступа:
Gokhfeld, D. M.; Гохфельд, Денис Михайлович; Savitskaya, N. E.; Popkov, S. I.; Kuzmichev, N. D.; Vasyutin, M. A.; Balaev, D. A.; Балаев, Дмитрий Александрович
}
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10.

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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