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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ким, Пётр Дементьевич, Патрин, Геннадий Семёнович, Марущенко, Дмитрий Анатольевич, Руденко Т. В., Поляков, Виктор Васильевич, Ким Т. В.
Заглавие : Исследование процессов перемагничивания магнитомягких и магнитожестких слоев в спин-вентильных структурах
Место публикации : Журн. СФУ. Сер. "Математика и физика". - 2012. - Т. 5, № 2. - С. 196-204. - ISSN 1997-1397; J. Sib. Fed. Univ. Math. Phys. - ISSN 2313-6022 (электронное издание)
Аннотация: Магнитные спин-вентильные структуры представляют большой практический интерес в каче- стве датчиков слабых магнитных полей, а также в качестве переключаемых элементов магнит- ной логики. Несмотря на большое количество проведенных экспериментальных и теоретических работ по спин-вентильным структурам эффекты межслойного взаимодействия, происходящие в данных структурах, в настоящее время остаются полностью не выясненными.Magnetic spin-valve structures are of great practical interest as sensors of weak magnetic fields, as well as switching elements of the magnetic logic. Despite the large number of experimental and theoretical work on spin-valve structures, the effects of interlayer interactions occurring in these structures at present time is not fully clarified.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Карпов И. В., Ушаков А. В., Лепешев, Анатолий Александрович, Дёмин В. Г., Федоров Л. Ю., Гончарова Е. А., Зеер Г. М., Жарков, Сергей Михайлович, Абкарян А. К.
Заглавие : Исследование микроструктурных особенностей, фазового состава и магнитных свойств композитов на основе YBCO и добавок несверхпроводящего компонента СuО, полученного в плазме дугового разряда низкого давления
Место публикации : Материаловедение. - 2020. - № 6. - С. 27-32. - ISSN 1684-579X, DOI 10.31044/1684-579X-2020-0-6-27-32
Примечания : Библиогр.: 12
Аннотация: Разработан метод, позволяющий формировать на поверхности дисперсных частиц порошка ВТСП-керамики несверхпроводящего покрытия, состоящего из самоорганизующихся кристаллов CuO, размеры которых менее длины когерентности, т.е. в пределах нескольких десятков нанометров. Показано, что сочетание самоорганизующихся структур в виде «усов» и наночастиц, появляющихся в результате совместного спекания порошков YBa2Cu3O7-x и электродуговых нанопорошков CuO, приводит к существенному увеличению плотности тока и появлению пик-эффекта в области сильных магнитных полей. Очень высокая плотность тока возникает из сложного пиннинга вихрей, где дефекты в виде «усов» обеспечивают большую энергию пиннинга, а наночастицы подавляют крип потока. Регулирование морфологии подобных структур возможно простым изменением концентрации нанодисперсных добавок. Показано, что наиболее оптимальной является добавка CuO в количестве 20% (мас.).A method has been developed, that allows one to form a non-superconducting coating on the surface of dispersed particles of an HTSC ceramic powder consisting of self-organizing CuO crystals whose sizes are less than the coherence length, i.e. within a few tens of nanometers. It was found out that the combination of self-organizing structures in the form of «whiskers» and nanoparticles resulting from the joint sintering of YBa2Cu3O7-x powders and CuO nanocrystals led to a significant increase in current density and the appearance of a peak effect in the region of strong magnetic fields. A very high current density arises from complex pinning of vortices, where defects in the form of «whiskers» provide a large pinning energy, and nanoparticles suppress creep flux. Morphology of such structures can be regulated by a simple change in the concentration of nanodispersed additives. It was determined that the addition of CuO in an amount of 20 wt.% was the most optimal.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Altin E., Gokhfeld D. M., Demirel S., Oz E., Kurt F., Altin S., Yakinci M.E.
Заглавие : Vortex pinning and magnetic peak effect in Eu(Eu,Ba)2.125Cu3Ox
Место публикации : J. Mater. Sci.-Mater. Electron.: Springer, 2014. - Vol. 25, Is. 3. - P.1466-1473. - ISSN 0957-4522, DOI 10.1007/s10854-014-1753-1. - ISSN 1573-482X
Примечания : Cited References: 30
Предметные рубрики: SUPERCONDUCTORS
FIELD
NANOCRYSTALLINE
TEMPERATURE
LOOP
Аннотация: Eu–Ba–Cu–O composition was synthesized by solid state reaction technique. To determine optimum growth temperature, heat treatment was examined on the material at 880–1,100 °C. Microstructural evolution, phase formation and elemental distribution depending on heat treatments were examined by using X-ray diffraction, scanning electron microscope, energy dispersive X-ray spectroscope analysis. Optimum fabrication conditions were determined as 1,020 °C for 24 h under oxygen atmosphere and detailed characterization of corresponding compound was performed. The magnetization hysteresis loops are expounded to be the product of superconducting Eu-123 grains and magnetic Eu2+ ions. The peak effect on the magnetization curves was described by the extended critical state model. Scaling of the pinning force was found such that the peak position is proportional to the irreversibility field H irr and the maximum pinning force is proportional to H irr 2 .
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gokhfeld D. M., Balaev D. A., Yakimov I. S., Petrov M. I., Semenov S. V.
Заглавие : Tuning the peak effect in the Y1−xNdxBa2Cu3O7−δ compound
Место публикации : Ceram. Int.: Elsevier, 2017. - Vol. 43, Is. 13. - P.9985-9991. - ISSN 02728842 (ISSN), DOI 10.1016/j.ceramint.2017.05.011
Примечания : Cited References: 37. - This work was supported by the Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Region Science and Technology Support Fund to the research project no. 16-48-243018 and the Russian Foundation for Basic Research, project no. 16-38-00400.
Ключевые слова (''Своб.индексиров.''): peak effect--bulk superconductors--critical current--pinning--characterization--ybco
Аннотация: Polycrystalline Y1−xNdxBa2Cu3O7−δ (x=0.02, 0.11, and 0.25) superconductors are synthesized. Nd atoms are uniformly distributed over grains. The magnetization loops of the samples have a pronounced second peak in a wide temperature range. The magnetization data are analyzed using the extended critical state model. It is found that the order-disorder transition of the vortex lattice is affected by doping with neodymium and temperature; the second-peak field and width decrease monotonically with increasing x value. The undoped polycrystalline YBa2Cu3O7−δ compound is assumed to exhibit the peak effect in higher magnetic fields.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Maksimova A. N., Kashurnikov V. A., Moroz A. N., Gokhfeld D. M.
Заглавие : Trapped field in superconductors with perforations
Коллективы : RFBRRussian Foundation for Basic Research (RFBR) [20-21-00085]; ROSATOM [20-21-00085]
Место публикации : J. Supercond. Nov. Magn. - 2022. - Vol. 35, Is. 1. - P.283-290. - ISSN 1557-1939, DOI 10.1007/s10948-021-06067-7. - ISSN 1557-1947(eISSN)
Примечания : Cited References: 35. - The reported study was funded by RFBR and ROSATOM according to the research project No 20-21-00085 (V.A. Kashurnikov, A.N. Moroz)
Предметные рубрики: MAGNETIZATION
BULK
Аннотация: The Monte Carlo method has been used to calculate the trapped magnetic field in superconducting plates with holes. The mechanism of flux pinning on the holes is implemented with special subprocesses added to the algorithm: vortex capture and emission, both occurring on the hole boundaries. Secondary peaks related to the holes emerge on the calculated profiles of the trapped magnetic field. It has been found that these peaks disappear in plates with sufficiently strong pinning or when the computational mesh is coarse (the case corresponding to a low resolution of probes in experiments). The dependence of the trapped field on the hole radius has been analyzed.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Orlov V. A., Ivanov A., Orlova I., Patrin G. S.
Заглавие : The drift of magnetic vortices in a random field of anchoring centers
Место публикации : IEEE Trans. Magn. - 2022. - Vol. 58, Is. 5. - Ст.2301110. - ISSN 00189464 (ISSN), DOI 10.1109/TMAG.2022.3160008
Примечания : Cited References: 65. - This work was supported by the framework of the State Task of the Ministry of Science and Higher Education of the Russian Federation under Grant FSRZ-2020-0011
Аннотация: This article theoretically solves the problem of the thermally activated motion of gas of non-interacting magnetic vortices/skyrmions in the field of defects located randomly, i.e., anchoring centers. The properties of the anchoring centers can also fluctuate. The factor that drives the gas of quasiparticles can be of any physical nature (fields, currents, gradients of the magnetic characteristics of the magnet, and so on). The process of vortices motion is described as a sequence of thermally activated separation of vortices from the attracting centers. The cases of some model distribution functions of the energy barriers are considered: 1) the barriers are of the same height; 2) the heights of the barriers are distributed evenly; and 3) the heights are distributed according to the normal law. Within these models, analytical expressions for the drift velocity and the diffusion gas coefficient of quasiparticles are obtained.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ushakov A. V., Karpov I. V., Lepeshev A. A., Petrov M. I., Fedorov L. Y.
Заглавие : Study of magnetic flux pinning in granular YBa2Cu3O7-y / nanoZrO2 composites
Коллективы : Ministry of Education and Sciences of the Russian Federation [7.4484.2011]
Место публикации : JETP Letters. - 2014. - Vol. 99, Is. 2. - P.99-103. - ISSN 0021-3640, DOI 10.1134/S002136401402009X. - ISSN 1090-6487
Примечания : Cited References: 15. - This work was supported in part by the Ministry of Education and Sciences of the Russian Federation (project no. 7.4484.2011).
Предметные рубрики: TEMPERATURE SUPERCONDUCTING WIRE
CRITICAL-CURRENT-DENSITY
FILMS
Аннотация: IIn this work, the effect of ZrO2 nanoparticles prepared in a low-pressure arc discharge plasma on magnetic flux pinning of granular YBa2Cu3O7-y /nanoZrO2 composites has been studied. It has been shown that the ZrO2 nanoparticles do not change the superconducting transition and the microstructure of superconductors. At a temperature of 5 K, the addition of 0.5 and 1 wt % of ZrO2 nanoparticles may lead to the additional effect of magnetic flux pinning and the increase in the critical current density J c. The J c value for composites with 1 wt % is two times larger than that for the reference sample. The fishtail effect is observed for YBa2Cu3O7-y /nanoZrO2 composites at the temperatures of 20 and 50 K. The problems associated with the additional effect of magnetic flux pinning of granular YBa2Cu3O7-y /nanoZrO2 composites and the appearance of the fishtail effect have been discussed.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Shaykhutdinov K. A., Balaev D. A., Gokhfeld D. M., Kuzmin Y. I., Popkov S. I., Petrov M. I.
Заглавие : Study of current-voltage characteristics of Bi-based high-temperature superconductors with fractal cluster structure
Коллективы : International Workshop on Weak Superconductivity
Место публикации : Physica C. - 2006. - Vol. 435, Is. 1-2. - P.19-22. - ISSN 0921-4534, DOI 10.1016/j.physc.2006.01.010
Примечания : Cited References: 18
Предметные рубрики: NORMAL-PHASE
VORTEX MOTION
TRANSPORT
Ключевые слова (''Своб.индексиров.''): superconducting foam--pinning--critical current density--fractal--percolation--cluster--cluster--critical current density--fractal--percolation--pinning--superconducting foam--bismuth--critical current density (superconductivity)--electric currents--electric potential--foams--percolation (solid state)--polycrystalline materials--cluster--fractal--pinning--superconducting foam--superconducting materials
Аннотация: We study the effect of the structure on critical currents and current-voltage characteristics (CVC's) of foamed bismuth-based polycrystalline high-temperature superconductors (HTSC). The fractal cluster structure of superconducting foams has been observed and the fractal dimension of boundaries between superconducting and normal clusters has been determined. Based on the magnetic and transport properties of the foamed polycrystalline superconductors, we have shown that the initial parts of CVC's of the superconducting foams are described well by the model that accounts the magnetic flux trapping in fractal clusters of a normal phase. (c) 2006 Elsevier B.V. All rights reserved.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Maksimova A.N., Gokhfeld D. M., Moroz A.N., Kashurnikov V.A.
Заглавие : Relaxation of the trapped magnetic flux in a mesoscopic HTS with artificial pinning in the form of submicron holes
Колич.характеристики :10 с
Место публикации : Chin. J. Phys. - 2024. - Vol. 88. - P.493-502. - ISSN 05779073 (ISSN), DOI 10.1016/j.cjph.2023.11.030. - ISSN 23099097 (eISSN)
Примечания : Cited References: 31. - V.A. Kashurnikov and A.N. Maksimova were supported by the Ministry of Science and Higher Education of the Russian Federation (state task project No. FSWU-2023-0031), A.N. Moroz was supported by MEPhI Program Priority 2030
Аннотация: Vortex relaxation has been studied in a microsized HTS with various distributions of artificial pinning in the form of submicro-holes. It has been shown that, in some cases, for a superconductor with dimensions up to several micrometers, the time dependences of the trapped magnetic field do not correspond with the collective creep model. The dependences of the trapped-field relaxation rate and vortex activation energy on the magnetizing field (up to 0.5 T) and temperature (up to 50 K) have been obtained. It has been shown that the presence of submicro-holes slightly increases the relaxation rate, mainly due to the decrease in the number of random nanosized pinning centers.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Terent'ev K. Yu., Gokhfel'd D. M., Popkov S. I., Shaikhutdinov K. A., Petrov M. I.
Заглавие : Pinning in a porous high-temperature superconductor Bi2223
Место публикации : Phys. Solid State: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2011. - Vol. 53, Is. 12. - P2409-2414. - ISSN 1063-7834, DOI 10.1134/S1063783411120250
Примечания : Cited References: 25. - This study was supported by the Ministry of Education and Science of the Russian Federation within the Russian Federal Targeted Program "Scientific and Scientific-Pedagogical Human Resources for the Innovative Russia in 2009-2013" (state contract no. NIR NK-209P) and the Krasnoyarsk Regional Foundation for Support of Research and Scientific-Technical Activities.
Предметные рубрики: II SUPERCONDUCTORS
MAGNETIC-FIELD
TRANSPORT
PHASE
TAPES
Аннотация: The current-voltage characteristics of a porous superconductor Bi(2)Sr(2)Ca(2)Cu(3)O (x) (Bi2223) have been measured at temperatures in the range from 10 to 90 K in magnetic fields of 0-80 kOe. The experimental dependences have been analyzed within the model allowing for pinning by clusters of a normal phase with fractal boundaries, as well as the model taking into account phase transformations of vortex matter. It has been found that the electrical resistance of the superconductor material significantly increases at temperatures of 60-70 K over the entire range of magnetic fields under consideration without changing in the sign of the curvature of the dependence R(I). It has been assumed that this behavior is associated with the specific feature of the pinning in a highly porous high-temperature superconductor, which lies in the fractality of the distribution of pinning centers in a wide range of self-similarity scales. The studied material at the aforementioned temperatures is characterized by the melting of the vortex structure.
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11.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Koblischka M. R., Gokhfeld D. M., Chang C., Hauet T., Hartmann U.
Заглавие : Pinning force scaling of electrospun Bi-2212 nanowire networks
Место публикации : Solid State Commun.: Elsevier, 2017. - Vol. 264. - P.16-18. - ISSN 00381098 (ISSN), DOI 10.1016/j.ssc.2017.07.002
Примечания : Cited References: 24. - This work is supported by the DFG project Ko2323/8, which is gratefully acknowledged
Ключевые слова (''Своб.индексиров.''): 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 T 35 K, where a strong superconducting signal prevails. The scaling analysis of the pinning forces was applied to interprete the data obtained. Both pure and Li-doped Bi2212 nanowire networks exhibit a peak position of h0∼ 0.11, which is smaller than the expected value of h0
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12.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Petrov M.I., Gokhfeld Yu.S., Balaev D.A., Popkov S.I., Dubrovskiy A.A., Gokhfeld D.M., Shaykhutdinov K.A.
Заглавие : Pinning enhancement by heterovalent substitution in Y1−xRExBa2Cu3O7−δ
Место публикации : Supercond. Sci. Technol. - 2008. - Vol. 21. - С. 085015
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13.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Petrov M.I., Gokhfeld Yu.S., Balaev D.A., Popkov S.I., Dubrovskiy A.A., Gokhfeld D.M., Shaykhutdinov K.A.
Заглавие : Pinning enhancement by heterovalent substitution in Y1−xRExBa2Cu3O7−δ
Место публикации : arXiv: Cornell University, 2008. - Ст.0803.0795
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14.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Petrov M. I., Gokhfeld Yu. S., Balaev D. A., Popkov S. I., Dubrovskiy A. A., Gokhfeld D. M., Shaykhutdinov K. A.
Заглавие : Pinning enhancement by heterovalent substitution in Y1−xRExBa2Cu3O7−δ
Место публикации : 25th International Conference on Low Temperature Physics (LT25). – Amsterdam, Netherlands. - August 6-13. – 2008. – PB-Tu130, p.304
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15.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Balaev D. A., Dubrovskiy A. A., Shaykhutdinov K. A., Popkov S. I., Petrov M. I.
Заглавие : Peculiarities of the time evolution of magnetoresistance of granular HTSC in a constant applied magnetic field
Коллективы :
Место публикации : Solid State Commun. - 2008. - Vol. 147, Is. 7-8. - P.284-287. - ISSN 0038-1098, DOI 10.1016/j.ssc.2008.05.044
Примечания : Cited References: 17. - This work was Supported by program "Quantum macrophysics" No. 3.4 of RAS and integration project No. 3.4 of SB RAS and in part by KSF, grant 18G011. D.A.B. and A.A.D. acknowledge the Russian Science Support Foundation.
Предметные рубрики: CRITICAL-STATE
SUPERCONDUCTORS
COMPOSITES
HYSTERESIS
RESISTANCE
Ключевые слова (''Своб.индексиров.''): superconductors--flux pinning and creep--tunneling--superconductors--flux pinning and creep--tunneling--agricultural products--carbon fiber reinforced plastics--copper oxides--electric conductivity--electric resistance--evolutionary algorithms--ferromagnetism--galvanomagnetic effects--grain (agricultural product)--health--hysteresis--magnetic devices--magnetic field effects--magnetic field measurement--magnetic fields--magnetic materials--magnetoelectronics--magnetoresistance--semiconductor metal boundaries--superconducting magnets--superconductivity--yttrium barium copper oxides--p ,p ,t measurements--applied (co)--applied magnetic fields--constant magnetic field (cmf)--elsevier (co)--evolution (co)--external fields--field induced--flux creep--hysteretic behavior--josephson couplings--low magnetic fields--magnetic (ce)--poly crystalline--superconducting grains--time evolutions--time relaxation--magnetism
Аннотация: The time evolution of the magnetoresistance of bulk YBCO + CuO composites at T = 4.2 K in constant applied magnetic fields was studied to clarify the mechanism of hysteretic behavior of magnetoresistance R(H) of granular HTSC. The composites represent "model" granular HTSC with weakened Josephson coupling between superconducting (YBCO) crystallites. It was found for the first time that on the ascending branch of R(H) dependence, the resistance at H = const decreased with time while on the descending branch, the resistance increased with time in ail applied constant magnetic field. In the range of low magnetic fields (below the minimum point of the descending branch of the R(H) dependence), the resistance at H const decreased again. Similar measurements performed oil pure polycrystalline YBCO at T = 77.4 K have shown that the behavior of evolution of resistance with time is similar to that observed for the composite. This proves the peculiarity of time evolution of maignetoresistance to be a common feature of granular HTSCs. The behavior revealed is well described by the model Of granular HTSC, where the intergrain media is in an effective magnetic field which is the superposition of the external field and the field induced by superconducting grains. The time evolution of resistance reflects the time relaxation of magnetization of HTSC grains due to the intragrain flux Creep Processes. (C) 2008 Elsevier Ltd. All rights reserved.
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16.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gokhfeld D. M., Maksimova A. N., Kashurnikov V. A., Moroz A. N.
Заглавие : Optimizing trapped field in superconductors with perforations
Место публикации : Physica C. - 2022. - Vol. 600. - Ст.1354106. - ISSN 0921-4534, DOI 10.1016/j.physc.2022.1354106
Примечания : Cited References: 28. - The reported study was partly funded by RFBR and the Krasnoyarsk Territorial Foundation for Support of Scientific and R&D Activities, project 20-42-240008 (D.M. Gokhfeld) and by RFBR and ROSATOM according to the research project 20-21-00085 (V.A. Kashurnikov, A.N. Moroz)
Аннотация: The use of artificial holes can improve the performance of high-temperature bulk superconductors. We report the results of Monte Carlo simulations of the trapped magnetic flux in superconducting samples with different configurations of perforated holes. Vortex trapping and emission at the hole boundary were modeled to account for flux pinning on the holes. It was found that the trapped flux can reach its maximum value, which does not depend on the number of holes. The dependence of the trapped flux on the diameter and number of holes is explored and described by the suggested relations that account for pinning on the holes and the effective hole area. Recommendations are provided to attain the maximum trapped flux for a fixed number or diameter of holes.
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17.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Man'kov Y. I.
Заглавие : Effect of conduction electrons on the law of approach to saturation of a metallic ferromagnet with surface pinning of the magnetic moment
Место публикации : Phys. Solid State: AMER INST PHYSICS, 1999. - Vol. 41, Is. 4. - P582-588. - ISSN 1063-7834, DOI 10.1134/1.1130829
Примечания : Cited References: 37
Предметные рубрики: ANISOTROPY
Аннотация: The effect of conduction electrons on the magnetization curve of a metallic ferromagnet with surface pinning of the magnetic moment is investigated theoretically. The electronic contribution is due to the rearrangement of the discrete spectrum of charge carriers trapped by the nonuniform magnetic induction of such a ferromagnet, and it is a kind of diamagnetic effect that appreciably decreases the volume-averaged magnetization of the ferromagnet. A power-law dependence H-3/4 on the external magnetic field H is obtained according to the law of magnetization approach to saturation. This dependence is due to the contribution of the conduction electrons. (C) 1999 American Institute of Physics. [S1063-7834(99)01804-3].
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18.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gokhfeld D. M., Balaev D. A., Petrov M. I., Popkov S. I., Shaykhutdinov K. A., Val'kov V. V.
Заглавие : Magnetization asymmetry of type-II superconductors in high magnetic fields
Место публикации : J. Appl. Phys.: AMER INST PHYSICS, 2011. - Vol. 109, Is. 3. - Ст.33904. - ISSN 0021-8979, DOI 10.1063/1.3544038
Примечания : Cited References: 23. - D. M. Gokhfeld is thankful to S. A. Satzuk and Yu. S. Gokhfeld for discussions. The work is supported by Project No. 7 of RAS Program "Quantum physics of condensed matter," Federal Target Program " Research and scientific-pedagogical cadres of Innovative Russia" and Grant No. 13 of Lavrentyev competition of young researchers of SB RAS.
Предметные рубрики: HIGH-TEMPERATURE SUPERCONDUCTORS
CRITICAL-STATE MODEL
CRITICAL-CURRENT DENSITIES
SURFACE-BARRIER
TRANSPORT
Ключевые слова (''Своб.индексиров.''): field distribution--high magnetic fields--inhomogeneous distribution--magnetization loops--pinning forces--thermal equilibriums--type ii superconductors--lead--magnetic fields--superconducting materials--superconductivity--magnetization
Аннотация: Inhomogeneous distribution of the pinning force in superconductor results in a magnetization asymmetry. A model considering the field distribution in superconductor was developed and symmetric and asymmetric magnetization loops of porous and textured Bi1.8Pb0.3Sr1.9Ca2Cu3Ox were fitted. It is found that the thermal equilibrium magnetization realizes in crystals smaller than some size depending on temperature and magnetic field. (C) 2011 American Institute of Physics. [doi:10.1063/1.3544038]
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19.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gokhfeld D. M., Semenov S. V., Nemtsev I. V., Yakimov I. S., Balaev D. A.
Заглавие : Magnetic ion substitution and peak effect in YBCO: the strange case of Y1–xGd xBa2Cu3O7–δ
Место публикации : J. Supercond. Novel Magn. - 2022. - Vol. 35, Is. 10. - P.2679-2687. - ISSN 15571939 (ISSN), DOI 10.1007/s10948-022-06317-2
Примечания : Cited References: 50. - 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
Аннотация: We present the results of a study of the superconducting and paramagnetic properties of polycrystalline Y1–xGdxBa2Cu3O7–δ samples. The critical current density and critical temperature of YBCO were weakly decreased by the Gd doping. A peak effect, which is a nonmonotonic dependence of the critical current density on magnetic field, was detected for all samples. The peak position shifted to higher magnetic fields with increasing Gd content. This behavior is opposite to the shift of the peak effect observed for other YBCO compounds doped by magnetic ions. This unusual behavior is apparently related to the realized granular structure instead of the type of doping ion. A correlation between the peak position and the granule size was found in the investigated samples and other polycrystalline YBCO compounds.
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20.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Balaev D. A., Dubrovskiy A. A., Popkov S. I., Shaykhutdinov K. A., Petrov M. I.
Заглавие : Magnetic field dependence of intergrain pinning potential in bulk granular composites YBCO plus CuO demonstrating large magneto-resistive effect
Разночтения заглавия :авие SCOPUS: Magnetic field dependence of intergrain pinning potential in bulk granular composites YBCO + CuO demonstrating large magneto-resistive effect
Место публикации : J. Supercond. Nov. Magn.: SPRINGER, 2008. - Vol. 21, Is. 4. - P243-247. - ISSN 1557-1939, DOI 10.1007/s10948-008-0324-1
Примечания : Cited References: 22
Предметные рубрики: HIGH-TEMPERATURE SUPERCONDUCTORS
ACTIVATED PHASE-SLIP
TRANSITION
DISSIPATION
MECHANISM
SENSORS
MODEL
Ключевые слова (''Своб.индексиров.''): bulk granular high-t(c) superconductor--magneto-resistive effect--josephson junction network--inter-grain pinning potential--bulk granular high-t c superconductor--inter-grain pinning potential--josephson junction network--magneto-resistive effect--bulk composites--bulk granular high-t subc/sub superconductor--granular composites--inter-grain pinning potential--josephson junction network--magnetic field dependences--magneto-resistive effect--pinning potential--resistive effects--resistive transitions--wide temperature range--y-ba-cu-o--atmospheric temperature--barium--copper--copper oxides--electric resistance--magnetic field measurement--magnetic fields--magnetoresistance--magnetos--yttrium barium copper oxides--magnetic field effects
Аннотация: The broadening of the resistive transition in magnetic field and isotherms of magnetoresistance of bulk composites Y-Ba-Cu-O + CuO have been studied. These composites exhibit large magneto-resistive effect in a wide temperature range below T (C) due to weakening of Josephson coupling in this system. The broadening of the resistive transition and magnetoresistance are explained well by the Ambegaokar-Halperin (AH) model for phase slip in Josephson junctions. The magnetic field dependence of pinning potential in the intergrain boundaries deduced from AH model found out to be similar to that of critical current of an array of Josephson junctions. The values of pinning energy point out that the large magneto-resistive effect observed in the composites results from flux flow-like processes at the intergrain boundaries.
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