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Komogortsev, S. V.
Scaling and the law of approach of the magnetization to saturation in nanostructured magnetic materials / S. V. Komogortsev, R. S. Iskhakov // Moscow Int. Symp. on Magnet. (MISM-2014) : 29 June - 3 July 2014 : вook of abstracts. - 2014. - Ст. 1PO-I1-20. - P. 455 . - ISBN 978-5-91978-025-0

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Доп.точки доступа:
Iskhakov, R. S.; Исхаков, Рауф Садыкович; Комогорцев, Сергей Викторович; Moscow International Symposium on Magnetism(6 ; 2014 ; June-July ; Moscow)
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Magnetoresistance anisotropy and scaling in textured high-temperature superconductor Bi1.8Pb0.3Sr1.9Ca2Cu3Ox / D. M. Gokhfel’d [et al.] // Phys. Solid State. - 2015. - Vol. 57, Is. 11. - P. 2145-2150, DOI 10.1134/S1063783415110128. - Cited References: 29 . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
ELECTRIC-POWER APPLICATIONS
   TRANSPORT CRITICAL-CURRENT
   T-C
   SINGLE-CRYSTALS
   TAPES
   DISSIPATION
   BOUNDARIES
   DENSITY
   FIELD
Аннотация: The magnetoresistance of the textured high-temperature superconductor (HTSC) Bi1.8Pb0.3Sr1.9Ca2Cu3Ox + Ag has been studied at different directions of the transport current I and external magnetic field H with respect to crystallographic directions of HTSC crystallites. When I and H are oriented along the ab planes of crystallites and φ is the angle between H and I, the anisotropic part of the magnetoresistance follows the functional dependence sin2φ, which is characteristic of vortex flows under Lorentz forces. The magnetoresistance R at H parallel to the c axis of crystallites (H || c) is higher than R at H || ab for both cases of I || c and I || ab. The anisotropy coefficient γ ≈ 2.3 has been estimated from the scaling of the dependences R(H) measured at H || c and H || ab. The inclusion of the magnetic field induced by the transport current allows scaling of the dependences R(H) at different values of I. A qualitative picture of the current flow along the c axis of crystallites in the textured HTSC has been proposed. © 2015, Pleiades Publishing, Ltd.

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Публикация на русском языке Анизотропия и скейлинг магнитосопротивления в текстурированном высокотемпературном сверхпроводнике Bi1.8Pb0.3Sr1.9Ca2Cu3Ox [Текст] / Д. М. Гохфельд [и др.] // Физ. тверд. тела : Физико-технический институт им. А. Ф. Иоффе РАН, 2015. - Т. 57 Вып. 11. - С. 2090-2094

Держатели документа:
Kirensky Institute of Physics, Siberian Branch of the Russian Academy of Sciences, Akademgorodok 50–38, Krasnoyarsk, Russian Federation
Siberian Federal University, pr. Svobodnyi 79, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Gokhfel'd, D. M.; Гохфельд, Денис Михайлович; Balaev, D. A.; Балаев, Дмитрий Александрович; Semenov, S. V.; Семёнов, Сергей Васильевич; Petrov, M. I.; Петров, Михаил Иванович
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Magnetoresistance hysteresis of bulk textured Bi1.8Pb0.3Sr1.9Ca2Cu3Ox + Ag ceramics and its anisotropy / D. A. Balaev [et al.] // Physica C. - 2010. - Vol. 470, Is. 1. - P. 61-67, DOI 10.1016/j.physc.2009.10.007. - Cited References: 24. - Authors thanks to I.L. Belozerova for help in preparation of textured ceramics. This work was supported by program N5 of RAS, project N7, and in part in frames of young scientist projects of Siberian Federal University, project N6. . - ISSN 0921-4534

РУБ Physics, Applied
Рубрики:
CRITICAL-CURRENT ANISOTROPY
   HIGH-TEMPERATURE SUPERCONDUCTOR
   CRITICAL-CURRENT DENSITY
   MAGNETIC HYSTERESIS
   TAPES
   FLUX
   YBA2CU3O7-DELTA
   FIELD
Кл.слова (ненормированные):
Magnetoresistance -- Anisotropy -- Scaling -- Magnetization -- Bi2223 -- BSCCO -- Anisotropy -- Bi2223 -- BSCCO -- Magnetization -- Magnetoresistance -- Scaling -- Bi-2223 -- BSCCO -- External fields -- Granular superconductors -- Magnetic induction -- Parameters characterizing -- Anisotropy -- Calcium -- Ceramic materials -- Crystallites -- Electric resistance -- Hysteresis -- Lead -- Magnetic moments -- Magnetoelectronics -- Magnetoresistance -- Nanocrystalline alloys -- Silver -- Superconducting materials -- Superconductivity -- Magnetic field effects
Аннотация: Magnetoresistance of bulk textured Bi1.8Pb0.3Sr1.9Ca2Cu3Ox + Ag ceramics has been studied in the magnetic fields applied parallel and perpendicular to a-b planes of Bi2223 crystallites. Besides well known anisotropy of magnetoresistance of textured superconductors (R-H parallel to c > RH parallel to a-b), anisotropic hysteresis of R(H) dependences was investigated. Parameters characterizing hysteretic R(H) curves differ for the cases H parallel to c and H parallel to a-b. This behavior is explained within the model of a granular superconductor where the total magnetic induction in the intercrystallite boundaries is superposition of the external field and the magnetic field induced by dipole magnetic moments of neighbor crystallites. (C) 2009 Elsevier B.V. All rights reserved.

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Держатели документа:
[Gokhfeld, D. M.] RAS, SD, LV Kirensky Phys Inst, High Magnet Fields Lab, Krasnoyarsk 660036, Russia
[Balaev, D. A.
Semenov, S. V.
Shaykhutdinov, K. A.] Siberian Fed Univ, Krasnoyarsk 660041, Russia
ИФ СО РАН
L.V. Kirensky Institute of Physics, Krasnoyarsk, 660036, Russian Federation
Siberian Federal University, Krasnoyarsk, 660041, Russian Federation

Доп.точки доступа:
Balaev, D. A.; Балаев, Дмитрий Александрович; Popkov, S. I.; Попков, Сергей Иванович; Semenov, S. V.; Семенов, Сергей Васильевич; Bykov, A. A.; Быков, Алексей Анатольевич; Shaykhutdinov, K. A.; Шайхутдинов, Кирилл Александрович; Gokhfeld, D. M.; Гохфельд, Денис Михайлович; Petrov, M. I.; Петров, Михаил Иванович
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Specific heat of YFe3(BO3)(4), Y0.5Gd0.5Fe3(BO3)(4), and GdFe3(BO3)(4) / A. N. Vasiliev [et al.] // J. Exp. Theor. Phys. - 2006. - Vol. 102, Is. 2. - P. 262-265, DOI 10.1134/S1063776106020075. - Cited References: 10 . - ISSN 1063-7761

РУБ Physics, Multidisciplinary
Рубрики:
TRIGONAL GDFE3(BO3)(4)
Кл.слова (ненормированные):
Antiferromagnetism -- Gadolinium compounds -- Heat transfer -- Ions -- Magnetic fields -- Single crystals -- Temperature measurement -- Yttrium compounds -- Magnetic entropy -- Magnetic system -- Reorientational transitions -- Scaling procedure -- Specific heat of solids
Аннотация: The specific heat was measured in the range 0.4-300 K in YFe3(BO3)(4), Y0.5Gd0.5Fe3(BO3)(4), and GdFe3(BO3)(4) single crystals. Sharp anomalies were found at temperatures of first-order structural, second-order antiferromagnetic, and first-order spin-reorientational transitions. A Neel temperature of about 37 K was found to be virtually independent of presence of rare-earth ions, indicating rather weak coupling of Gd and Fe subsystems. The contribution of the magnetic system to specific heat was separated through the scaling procedure allowing determination of the magnetic entropy of Fe and Gd subsystems. At the lowest temperatures, the specific heat in GdFe3(BO3)(4) exhibits a Schottky-type anomaly, which is due to Gd3+ eightfold degenerate ground-level splitting by the internal magnetic field of the Fe subsystem of about 7 T.

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Держатели документа:
Moscow MV Lomonosov State Univ, Low Temp Phys Dept, Moscow 119992, Russia
Russian Acad Sci, Siberian Div, Kirensky Inst Phys, Krasnoyarsk 660036, Russia
Univ Tokyo, Inst Solid State Phys, Kashiwa, Chiba 2778581, Japan
ИФ СО РАН
Low-Temperature Physics Department, Moscow State University, Moscow, 119992, Russian Federation
Kirensky Institute of Physics, Siberian Division, Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation
Institute for Solid-State Physics, University of Tokyo, Kashiwa, Chiba, 277-8581, Japan

Доп.точки доступа:
Vasiliev, A. N.; Popova, E. A.; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич; Temerov, V. L.; Темеров, Владислав Леонидович; Hiroi, Z.
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    Pinning force scaling of electrospun Bi-2212 nanowire networks / M. R. Koblischka [et al.] // Solid State Commun. - 2017. - Vol. 264. - P. 16-18, DOI 10.1016/j.ssc.2017.07.002. - Cited References: 24. - This work is supported by the DFG project Ko2323/8, which is gratefully acknowledged . - ISSN 0038-1098
   Перевод заглавия: Скейлинг силы пиннинга сетей нанопроволок Bi-2212, полученных электропрядением
Кл.слова (ненормированные):
Electrospinning -- Bi-2212 superconductors -- Flux pinning -- Pinning force scaling
Аннотация: Flux pinning forces were determined on different network samples of superconducting Bi2Sr2CaCu2O8 (Bi-2212) nanowires prepared by the electrospinning technique. We employed magnetization data determined by SQUID magnetometry in a wide temperature range 10 K
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Держатели документа:
Institute of Experimental Physics, Saarland University, Campus C 6 3, Saarbrucken, Germany
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Akademgorodok 50/38, Krasnoyarsk, Russian Federation
Institut Jean Lamour, UMR CNRS-Universite de Lorraine, Vand?vre-les-Nancy, France

Доп.точки доступа:
Koblischka, M. R.; Gokhfeld, D. M.; Гохфельд, Денис Михайлович; Chang, C.; Hauet, T.; Hartmann, U.
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Gokhfeld, D. M.
Magnetization of polycrystalline high-Tc superconductors / D. Gokhfeld // High-temperature superconductors: occurrence, synthesis and applications. - New York : Nova Science Publishers, 2018. - P. 181-194. - Cited References: 29 . - ISBN 9781536133424. - ISBN 9781536133417
Кл.слова (ненормированные):
Critical current -- Magnetization -- Pinning force -- Scaling -- Surface
Аннотация: Magnetization loops of polycrystalline high-Tc superconductors always are semireversible; they have some asymmetry relative to field axis. These magnetization loops are described successfully by the extended critical state model, which accounts the equilibrium magnetization of the grain surface. The model is applied to determine the intragranular critical current density, the depth of the equilibrium surface region and the grain size from magnetic measurements. The dependence of the critical current density on the magnetic field, the pinning force scaling, the full penetration field and the irreversibility field are discussed.
Асимметричные петли намагниченности высокотемпературных сверхпроводников успешно описываются расширенной моделью критического состояния. Внутригранульная плотность критического тока, глубина приповерхностного слоя с равновесной намагниченностью и размер гранул могут быть получены из магнитных измерений.

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

Доп.точки доступа:
Гохфельд, Денис Михайлович
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