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Балаев, Дмитрий Александрович.
Доминирующее влияние эффекта сжатия магнитного потока в межгранульной среде гранулярного ВТСП на процессы диссипации во внешнем магнитном поле / Д. А. Балаев, С. В. Семёнов, М. И. Петров // Физ. тверд. тела. - 2013. - Т. 55, Вып. 12. - С. 2305-2312. - Работа выполнена при поддержке гранта РФФИ N 13-02-00358
Аннотация: Представлены эксперименты, демонстрирующие влияние сжатия магнитного потока в межгранульных границах гранулярного ВТСП, помещенного во внешнее магнитное поле, на процессы диссипации. Сжатие потока происходит вследствие диамагнитного поведения гранул сверхпроводника и реализации джозефсоновской среды в межгранульных границах. За счет этого межгранульные границы находятся в некотором эффективном поле, зависящем от магнитного состояния (намагниченности) сверхпроводящих гранул. На основании анализа совокупности экспериментальных данных (зависимостей электросопротивления R, намагниченности от поля и температуры T, а также вольт-амперных характеристик) делается вывод, что именно температурная эволюция эффективного поля в межгранульной среде в основном определяет вид зависимостей R(T) в слабых (до ~ 103 Oe) внешних полях. Это необходимо учитывать при интерпретации экспериментов по магниторезистивным эффектам в гранулярных ВТСП в рамках различных теорий. Сделанный вывод предполагает также серьезную корректировку полученных ранее результатов.

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Переводная версия Dominant influence of the compression effect of a magnetic flux in the intergranular medium of a granular high-temperature superconductor on dissipation processes in an external magnetic field. - [Б. м. : б. и.]

Держатели документа:
Институт физики им. Л.В. Киренского СО РАН

Доп.точки доступа:
Семёнов, Сергей Васильевич; Semenov, S.V.; Петров, Михаил Иванович; Petrov, M.I.; Balaev, D. A.
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Balaev, D. A.
Dominant influence of the compression effect of a magnetic flux in the intergranular medium of a granular high-temperature superconductor on dissipation processes in an external magnetic field / D. A. Balaev, S. V. Semenov, M. I. Petrov // Physics of the Solid State. - 2013. - Vol. 55, Is. 12. - P. 2422-2430, DOI 10.1134/S1063783413120044 . - ISSN 1063-7834
Аннотация: Experiments have been presented that demonstrate the effect of the compression of a magnetic flux in grain boundaries of a granular high-temperature superconductor in an external magnetic field on the dissipation processes. The compression of the magnetic flux is associated with the diamagnetic behavior of superconducting grains and the existence of a Josephson medium in grain boundaries. Under these conditions, grain boundaries are in an effective magnetic field that depends on the magnetic state (magnetization) of the superconducting grains. Based on the analysis of experimental data (dependences of the electrical resistance R and magnetization on the magnetic field H and temperature T, as well as current-voltage characteristics), the conclusion has been drawn that it is the temperature evolution of the effective magnetic field in the intergranular medium which primarily determines the behavior of the dependences R(T) in weak external magnetic fields of no more than ?103 Oe. This should be taken into account in the interpretation of experiments on the magnetoresistance effect in granular high-temperature superconductors in terms of different theories. The conclusion drawn here also implies a significant correction of the previously obtained results.

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Публикация на русском языке Балаев, Дмитрий Александрович. Доминирующее влияние эффекта сжатия магнитного потока в межгранульной среде гранулярного ВТСП на процессы диссипации во внешнем магнитном поле / Д. А. Балаев // Физика твердого тела. - 2013. - Т. 55, Вып. 12. - С. 2305-2312

Доп.точки доступа:
Semenov, S. V.; Семёнов, Сергей Васильевич; Petrov, M. I.; Петров, Михаил Иванович; Балаев, Дмитрий Александрович
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Magnetoresistance of porous polycrystalline HTSC: Effect of the transport current on magnetic flux compression in intergranular medium / D. A. Balaev [et al.] // Phys. Solid State. - 2014. - Vol. 56, Is. 8. - P. 1542-1547, DOI 10.1134/S1063783414080034. - Cited References: 47 . - ISSN 1063-7834. - ISSN 1090-6460

РУБ Physics, Condensed Matter
Рубрики:
HIGH-TEMPERATURE SUPERCONDUCTOR
   CURRENT-VOLTAGE CHARACTERISTICS
   GRANULAR YBA2CU3O7-DELTA
   JOSEPHSON MEDIUM
   RESISTIVE TRANSITION
   BULK COMPOSITES
   T-C
   FIELD
   DISSIPATION
   PHASE
Аннотация: The hysteretic dependences of the magnetoresistance of porous (38% of the theoretical density) granular high-temperature superconductor (HTSC) Bi1.8Pb0.3Sr1.9Ca2Cu3O (x) have been analyzed in the model of the effective intergranular field. This effective field has been defined by the superposition of the external field and the field induced by magnetic moments of superconducting grains. The magnetic flux compression in an intergranular medium, characterized by the effective field, controls the hysteretic behavior of the magnetoresistance. It has been found that the magnetoresistance hysteresis width for the studied porous HTSC depends on the transport current, in contrast to the superconductor of the same composition with high physical density (more than 90% of the theoretical value). For a porous superconductor, a significant current concentration occurs in the region of the grain boundaries, which is caused by features of its microstructure. A current-induced increase in the effective boundary length results in a decrease in the flux compression, a decrease in the effective field in the intergranular medium, and a magnetoresistance hysteresis narrowing with increasing current.

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Публикация на русском языке Магнитосопротивление пористого поликристаллического ВТСП: влияние транспортного тока на сжатие магнитного потока [Текст] / Д. А. Балаев [и др.] // Физ. тверд. тела. - 2014. - Т. 56 Вып. 8. - С. 1492-1497

Держатели документа:
Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
Siberian Fed Univ, Inst Engn Phys & Radio Elect, Krasnoyarsk 660074, Russia

Доп.точки доступа:
Balaev, D. A.; Балаев, Дмитрий Александрович; Popkov, S. I.; Попков, Сергей Иванович; Shaikhutdinov, K. A.; Шайхутдинов, Кирилл Александрович; Petrov, M. I.; Петров, Михаил Иванович; Gokhfeld, D. M.; Гохфельд, Денис Михайлович
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Local electron structure and magnetization in beta-Fe86Mn13C / L. I. Kveglis [et al.] // Superlattices Microstruct. - 2009. - Vol. 46, Is. 1-2. - P. 114-120, DOI 10.1016/j.spmi.2008.11.023. - Cited References: 12 . - ISSN 0749-6036

РУБ Physics, Condensed Matter
Рубрики:
PHASE
Кл.слова (ненормированные):
Frank-Kasper structure -- Local electron structure -- Spin-polarized electronic conditions -- Frank-Kasper structure -- Local electron structure -- Spin-polarized electronic conditions -- Austenite grain -- Austenitic -- C-steel -- Close packed structures -- Dynamic loadings -- Electron structures -- Frank-Kasper structure -- Induction method -- Intergranular -- Local electron structure -- Local electronic structures -- Local magnetization -- Self-consistent field -- Spin-polarized electronic conditions -- Transition regions -- Austenite -- Diffraction -- Electronic structure -- Electrons -- Magnets -- Manganese -- Manganese compounds -- Optical microscopy -- Phase transitions -- Spin dynamics -- Steel -- Textures -- Magnetization -- Frank-Kasper structure -- Local electron structure -- Spin-polarized electronic conditions -- Austenite grain -- Austenitic -- C-steel -- Close packed structures -- Dynamic loadings -- Electron structures -- Frank-Kasper structure -- Induction method -- Intergranular -- Local electron structure -- Local electronic structures -- Local magnetization -- Self-consistent field -- Spin-polarized electronic conditions -- Transition regions -- Austenite -- Diffraction -- Electronic structure -- Electrons -- Magnets -- Manganese -- Manganese compounds -- Optical microscopy -- Phase transitions -- Spin dynamics -- Steel -- Textures -- Magnetization
Аннотация: The aim of the work is to elucidate the origin of magnetization presence in austenitic Fe86Mn13C steel after dynamic loading. The observation of microstructures in the region of transition from FCC austenitic Fe86Mn13C steel to FK12 + FK14 type of Frank-Kasper tetrahedral close packed structure is described. We used the methods of optical microscopy, electron microscopy, electron diffraction and X-ray-diffraction to investigate the phase transition region. Changes of local magnetization were estimated by induction method. To explain the magnetization origin of the sample consisting of austenite grains and intergranular layers, which have Frank-Kasper's structure (FK12 + FK14) typical of beta-Fe-Mn, the local electronic structure has been investigated for intergranular layers. The local electron structure of FK12 and FK14 clusters have been simulated by method of self-consistent field to understand the nature of non-zero magnetization of the Fe87Mn13 alloy exposed by shock deformation. It was shown, that numbers of states with upward and downward spins are not equal. Therefore the occurrence of magnetization is possible. (c) 2009 Published by Elsevier Ltd

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Держатели документа:
[Kveglis, L. I.
Abylkalykova, R. B.] E Kazakhstan Tech Univ, Ust Kamenogorsk, Kazakhstan
[Noskov, F. M.] Siberian Fed Univ, Krasnoyarsk, Russia
[Arhipkin, V. G.
Musikhin, V. A.] SB RAS, Inst Phys, Krasnoyarsk, Russia
[Cherepanov, V. N.
Niavro, A. V.] Siberian Phys & Tech Inst, Tomsk, Russia
ИФ СО РАН
East-Kazakstan Technical University, Kazakhstan
Siberian Federal University, Krasnoyarsk, Russian Federation
Institute of Physics SB RAS, Krasnoyarsk, Russian Federation
Siberian Physics and Technical Institute, Tomsk, Russian Federation
East-Kazakstan Technical University, Kazakhstan
Siberian Federal University, Krasnoyarsk, Russian Federation
Institute of Physics SB RAS, Krasnoyarsk, Russian Federation
Siberian Physics and Technical Institute, Tomsk, Russian Federation

Доп.точки доступа:
Kveglis, L. I.; Квеглис, Людмила Иосифовна; Abylkalykova, R. B.; Noskov, F. M.; Arkhipkin, V. G.; Архипкин, Василий Григорьевич; Musikhin, V. A.; Cherepanov, V. N.; Niavro, A. V.; International Conference on Nano-structures Self-Assembling(2 ; 2008 ; July ; 7-10 ; Rome, Italy)
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Diffusion of strontium in the intergranular boundaries of La2–xSrxCuO4 / A. A. Bykov, D. M. Gokhfeld, K. Y. Terent’ev [et al.] // Russ. J. Phys. Chem. A. - 2021. - Vol. 95, Is. 6. - P. 1165-1168, DOI 10.1134/S0036024421060066. - Cited References: 11. - This work was supported by the Russian Science Foundation, project no. 17-72-10067 . - ISSN 0036-0244
Кл.слова (ненормированные):
composites -- superconductivity -- diffusion -- grain boundaries -- diffusion front -- LSCO (La1.56Sr0.44CuO4)
Аннотация: Energy dispersive X-ray spectroscopy and scanning electron microscopy are used to study La2CuO4–La1.56Sr0.44CuO4 composites with different annealing times. Maps of the strontium distribution for such systems are calculated and compared to experimental data obtained for the area of contact between two dissimilar granules. The coefficient of lattice diffusion of strontium is found. At the areas of contact between La2CuO4 and La1.56Sr0.44CuO4 granules, the strontium concentration corresponds to superconducting phase La2−xSrxCuO4 with x = 0.05–0.25. The technological parameters of synthesis affect the size and number of superconducting and normal regions. Prolonged annealing lowers the gradient of the strontium concentration, which halts the increase in the size of the superconducting regions. This saturation confirms the diffusion front model.

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Публикация на русском языке Диффузия стронция в межгранульной границе La2−xSrxCuO4 [Текст] / А. А. Быков, Д. М. Гохфельд, К. Ю. Терентьев [и др.] // Журн. физ. химии. - 2021. - Т. 95 № 6. - С. 903-907

Держатели документа:
Petersburg Institute of Nuclear Physics, National Research Center Kurchatov Institute, Gatchina, 188300, Russian Federation
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Bykov, A. A.; Gokhfeld, D. M.; Гохфельд, Денис Михайлович; Terent'ev, K. Yu.; Терентьев, Константин Юрьевич; Volochaev, M. N.; Волочаев, Михаил Николаевич; Petrov, M. I.; Петров, Михаил Иванович
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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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