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Study of magnetic flux pinning in granular YBa2Cu3O7-y / nanoZrO2 composites / A. V. Ushakov [et al.] // JETP Letters. - 2014. - Vol. 99, Is. 2. - P. 99-103, DOI 10.1134/S002136401402009X. - 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). . - ISSN 0021-3640. - ISSN 1090-6487

РУБ Physics, Multidisciplinary
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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Публикация на русском языке Исследование пиннинга магнитного потока в YBa2Cu3O7-y/наноZrO2 гранулярных композитах [Текст] / А. В. Ушаков [и др.] // Письма в Журн. эксперим. и теор. физ. : Наука, 2014. - Т. 99 Вып. 1-2. - С. 105-109

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

Доп.точки доступа:
Ushakov, A. V.; Karpov, I. V.; Lepeshev, A. A.; Petrov, M. I.; Петров, Михаил Иванович; Fedorov, L. Y.; Ministry of Education and Sciences of the Russian Federation [7.4484.2011]
}
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Compression of a magnetic flux in the intergrain medium of a YBa2Cu3O7 granular superconductor from magnetic and magnetoresistive measurements / D. A. Balaev [et al.] // J. Appl. Phys. - 2011. - Vol. 110, Is. 9. - Ст. 93918, DOI 10.1063/1.3657775. - Cited References: 21. - We thank V. V. Val'kov and A. D. Balaev for useful discussions of the results and I. Nemtsev for microscopic study of the samples. The study was supported by the Program of the Russian Academy of Sciences No. 5, Project No. 7. . - ISSN 0021-8979

РУБ Physics, Applied
Рубрики:
HIGH-TEMPERATURE SUPERCONDUCTORS
   CRITICAL-CURRENT-DENSITY
   CRITICAL-STATE MODEL
   CRITICAL CURRENTS
   JOSEPHSON MEDIUM
   FIELD
   TRANSITION
Кл.слова (ненормированные):
Effective field -- External fields -- Field dependence -- Field induced -- Granular superconductors -- Inter-grain -- Josephson -- Magnetoresistive -- Space between -- Superconducting grains -- Transport currents -- Electric resistance -- Magnetic flux -- Magnetic moments -- Superconductivity -- Superconducting materials
Аннотация: A method to determine a value of the effective field in the intergrain medium of a granular superconductor is proposed. The space between superconducting grains is considered to be a Josephson medium where passage of the transport current causes dissipation and the effective field is superposition of external field H and the field induced by magnetic moments of superconducting grains. The method proposed is based on the comparison of hysteresis field dependences of magnetoresistance and magnetization and their relaxation at H=const. By the example of granular YBa2Cu3O7, it is shown that, in the region of weak fields, the effective field in the intergrain medium exceeds by far the external field, i.e., compression of a magnetic flux occurs. (C) 2011 American Institute of Physics. [doi: 10.1063/1.3657775]

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Держатели документа:
[Balaev, D. A.
Popkov, S. I.
Semenov, S. V.
Shaykhutdinov, K. A.
Shabanov, A. V.
Petrov, M. I.] Russian Acad Sci, Kirensky Inst Phys, Siberian Branch, Krasnoyarsk 660036, Russia
[Balaev, D. A.
Sabitova, E. I.] Siberian Fed Univ, Krasnoyarsk 660041, Russia
ИФ СО РАН
Kirensky Institute of Physics, Russian Academy of Sciences, Siberian Branch, 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; Sabitova, E. I.; Semenov, S. V.; Семенов, Сергей Васильевич; Shaykhutdinov, K. A.; Шайхутдинов, Кирилл Александрович; Shabanov, A. V.; Шабанов, Александр Васильевич; Petrov, M. I.; Петров, Михаил Иванович
}
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Magnetoresistance hysteresis in granular HTSCs as a manifestation of the magnetic flux trapped by superconducting grains in YBCO+CuO composites / D. A. Balaev [et al.] // J. Exp. Theor. Phys. - 2007. - Vol. 105, Is. 6. - P. 1174-1183, DOI 10.1134/S1063776107120084. - Cited References: 53 . - ISSN 1063-7761

РУБ Physics, Multidisciplinary
Рубрики:
HIGH-TEMPERATURE SUPERCONDUCTOR
   CRITICAL-CURRENT-DENSITY
   CURRENT-VOLTAGE CHARACTERISTICS
   BA-CU-O
   TRANSPORT-PROPERTIES
   FIELD
   YBA2CU3O7-DELTA
   FLUCTUATIONS
   FINGERPRINT
   NETWORK
Кл.слова (ненормированные):
Critical currents -- Hysteresis -- Hysteresis loops -- Josephson junction devices -- Magnetic flux -- Magnetoresistance -- Yttrium barium copper oxides -- Granular superconductors -- Hysterestic dependence -- Negative magnetoresistance -- Transport current -- Composite materials
Аннотация: Hysterestic behavior of the magnetoresistance of granular HTSCs and its interaction with the magnetic hysteresis are studied by measuring magnetoresistance R(H) and critical current I-c(H) of composites formed by HTSC Y0.75Lu0.25Ba2CU3O7 and CuO. A network of Josephson junctions is formed in such composites, in which the nonsuperconducting component plays the role of barriers between HTSC grains. Hysteretic dependences R(H) of magnetoresistance are studied in a wide range of transport current density j and are analyzed in the framework of the two-level model of a granular superconductor, in which dissipation takes place in the Josephson medium and the magnetic flux can be pinned both in grains and in the Josephson medium. The interrelation between the hysteresis of critical current I-c(H) and the evolution of the hysterestic dependence R(H) of the magnetoresistance upon transport current variation is demonstrated experimentally. The effect of the magnetic past history on the hysteretic behavior of R(H) and the emergence of a segment with a negative magnetoresistance are analyzed. It is shown for the first time that the R(H) dependences are characterized by a parameter that is independent of the transport current, viz., the width of the R(H) hysteresis loop.

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Держатели документа:
[Balaev, D. A.
Gokhfeld, D. M.
Dubrovskii, A. A.
Popkov, S. I.
Shaikhutdinov, K. A.
Petrov, M. I.] Russian Acad Sci, Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
ИФ СО РАН
Kirenskii Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk 660036, Russian Federation

Доп.точки доступа:
Balaev, D. A.; Балаев, Дмитрий Александрович; Gokhfeld, D. M.; Гохфельд, Денис Михайлович; Dubrovskii, A. A.; Дубровский, Андрей Александрович; Popkov, S. I.; Попков, Сергей Иванович; Shaikhutdinov, K. A.; Шайхутдинов, Кирилл Александрович; Petrov, M. I.; Петров, Михаил Иванович
}
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Mechanism of the hysteretic behavior of the magnetoresistance of granular HTSCs: The universal nature of the width of the magnetoresistance hysteresis loop / D. A. Balaev [et al.] // J. Exp. Theor. Phys. - 2009. - Vol. 108, Is. 2. - P. 241-248, DOI 10.1134/S106377610902006X. - Cited References: 32. - This study was carried out under the program "Quantum Macrophysics" of the Russian Academy of Sciences and complex integration project no. 3.4 of the Siberian Branch of the Russian Academy of Sciences, and was partly supported by the Krasnoyarsk Regional Science Foundation (grant no. 18G011). D. A. B. and A. A. D. are grateful to the Foundation for Supporting National Science Projects. . - ISSN 1063-7761

РУБ Physics, Multidisciplinary
Рубрики:
CRITICAL-CURRENT-DENSITY
   HIGH-TEMPERATURE SUPERCONDUCTOR
   CURRENT-VOLTAGE CHARACTERISTICS
   EXTERNAL MAGNETIC-FIELD
   BA-CU-O
   JOSEPHSON MEDIUM
   CRITICAL-STATE
   FLUX
   COMPOSITES
   YBA2CU3O7-DELTA
Кл.слова (ненормированные):
Barium -- Calcium -- Damping -- Electric resistance -- High temperature superconductors -- Magnetic field effects -- Magnetic materials -- Magnetoelectronics -- Magnetoresistance -- Stiffness -- Classical systems -- Critical densities -- Experimental datum -- External conditions -- Flux trapping -- Hysteretic behaviors -- Josephson vortices -- Residual resistances -- Transport currents -- Universal behaviors -- Y-ba-cu-o -- Hysteresis
Аннотация: The hysteretic behavior of the magnetoresistance R(H) of granular high-temperature superconductors (HTSCs) of the Y-Ba-Cu-O, Bi-Ca-Sr-Cu-O, and La-Sr-Cu-O classical systems is investigated for transport current densities lower and higher than the critical density (at H = 0). All systems exhibit universal behavior of the width of the magnetoresistance hysteresis loop: independence of transport current under identical external conditions. This means that flux trapping in HTSC grains is the main mechanism controlling the hysteretic behavior of the magnetoresistance of granular HTSCs, while pinning of Josephson vortices in the intragranular medium makes no appreciable contribution to the formation of magnetoresistance hysteresis (when transport current flows through the sample). Experimental data on relaxation of residual resistance after the action of a magnetic field also confirm this conclusion.

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Держатели документа:
[Balaev, D. A.
Dubrovskii, A. A.
Shaikhutdinov, K. A.
Popkov, S. I.
Gokhfeld, D. M.
Gokhfeld, Yu. S.
Petrov, M. I.] Russian Acad Sci, Siberian Branch, Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
ИФ СО РАН
Kirenskii Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Balaev, D. A.; Балаев, Дмитрий Александрович; Dubrovskii, A. A.; Дубровский, Андрей Александрович; Shaikhutdinov, K. A.; Шайхутдинов, Кирилл Александрович; Popkov, S. I.; Попков, Сергей Иванович; Gokhfeld, D. M.; Гохфельд, Денис Михайлович; Gokhfeld, Yu. S.; Гохфельд, Юлия Сергеевна; Petrov, M. I.; Петров, Михаил Иванович; Quantum Macrophysics of the Russian Academy of Sciences [3.4]; Krasnoyarsk Regional Science Foundation [18G011]; Foundation for Supporting National Science Projects
}
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Semenov, S. V.
Dissipation in granular high-temperature superconductors: New approach to describing the magnetoresistance hysteresis and the resistive transition in external magnetic fields / S. V. Semenov, A. D. Balaev, D. A. Balaev // J. Appl. Phys. - 2019. - Vol. 125, Is. 3. - Ст. 033903, DOI 10.1063/1.5066602. - Cited References: 79. - The work was supported by the Russian Science Foundation (Grant No. 17-72-10050). We are grateful to K. Terent'ev for the preparation of the sample and D. Gokhfeld for useful discussions. . - ISSN 0021-8979. - ISSN 1089-7550

РУБ Physics, Applied
Рубрики:
CRITICAL-CURRENT-DENSITY
VORTEX-GLASS SUPERCONDUCTIVITY
ANISOTROPIC ENERGY-DISSIPATION
Аннотация: An approach to describing the R(H) magnetoresistance hysteresis in granular high-temperature superconductors and behavior of the R(T) resistive transition in these objects in an external magnetic field is proposed. The dissipation is attributed to the subsystem of intergrain boundaries, which form a Josephson junction network. The approach is based on accounting for the effect of magnetic moments of superconducting grains on the resulting (effective) field in the intergrain medium. The described procedure includes (i) establishing of the degree of magnetic flux crowding in the intergrain medium by comparing the experimental data on the R(H) magnetoresistance hysteresis and magnetization M(H), (ii) determining the effective field Beff in the intergrain medium as a function of external field H and temperature T with regard to the thermomagnetic prehistory, and (iii) fitting the experimental R(H) and R(T) dependences using the Arrhenius expression R ∼ exp(–EJ/ kB T), where EJ is the parameter corresponding to the Josephson coupling energy. The fundamental novelty of the proposed approach is the extraction of the functional dependences of EJ on the effective field Beff in the intergrain medium rather than on the external field H, as was made in many previous works. It is shown that the proposed approach makes it possible to adequately describe both the R(H) hysteretic dependences and R(T) dependences of the Y-Ba-Cu-O high-temperature superconductor samples with different morphologies and critical current densities.

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Держатели документа:
RAS, SB, KSC, Kirensky Inst Phys,Fed Res Ctr, Krasnoyarsk 660036, Russia.

Доп.точки доступа:
Balaev, A. D.; Балаев, Александр Дмитриевич; Balaev, D. A.; Балаев, Дмитрий Александрович; Семёнов, Сергей Васильевич; Russian Science Foundation [17-72-10050]
}
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Semenov, S. V.
Universal behavior and temperature evolution of the magnetoresistance hysteresis in granular high-temperature superconductors Y-Ba-Cu-O / S. V. Semenov, D. A. Balaev, M. I. Petrov // Phys. Solid State. - 2021. - Vol. 63, Is. 7. - P. 1069-1080, DOI 10.1134/S1063783421070192. - Cited References: 80. - The authors are grateful to D.M. Gokhfeld for discussion of the results. The measurements of the transport properties were performed in part on a PPMS-6000 system of the Center for Collective Use, Krasnoyarsk Scientific Center, Siberian Branch of the Russian Academy of Sciences . - ISSN 1063-7834. - ISSN 1090-6460

РУБ Physics, Condensed Matter
Рубрики:
CRITICAL-CURRENT-DENSITY
CURRENT-VOLTAGE CHARACTERISTICS
MAGNETIC-FLUX COMPRESSION
Кл.слова (ненормированные):
granular HTS -- magnetoresistance hysteresis -- grain boundaries
Аннотация: Regularities in the behavior of the magnetoresistance hysteresis R(H) in the granular yttrium high-temperature superconductors (HTSs) have been established. For this purpose, a comparative analysis of the magnetotransport properties has been carried out on the granular HTS samples, which exhibit (i) approximately the same magnetic properties and temperatures of the onset of the superconducting transition (90.5–93.5 K, which is characteristic of HTS grains) and (ii) different critical transport currents JC (which is characteristic of grain boundaries). Despite a significant (by more than an order of magnitude) spread of the JC values for the three samples, a universal behavior of the magnetoresistance hysteresis has been found, which is apparently inherent in all the granular Y–Ba–Cu–O compounds. The R(H) hysteresis is extremely broad and, in a fairly wide external field range, the dependence of the magnetoresistance hysteresis width ΔН on the field Hdec (the external field for the decreasing hysteresis branch is Н = Hdec) is almost linear: ΔH ≈ Hdec. This behavior is observed over the entire temperature range of implementation of the superconducting state (the investigations have been carried out at temperatures of 77–88 and 4.2 K). The result obtained has been explained by considering the effective field in grain boundaries, which is a superposition of the external field and the field induced by the magnetic moments of grains. The field induced by grains, in turn, significantly increases in the region of grain boundaries due to the magnetic flux compression (the grain boundary length is shorter than the HTS grain size by several orders of magnitude). The aforesaid has been confirmed by the analysis of the R(H) hysteresis for the Y–Ba–Cu–O- and CuO-based HTS composite, in which the grain boundary length is purposefully increased; as a result, the flux compression is less pronounced and the R(H) hysteresis narrows.

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Публикация на русском языке Семенов, Сергей Васильевич. Универсальность поведения гистерезиса магнитосопротивления и его температурной эволюции для гранулярных высокотемпературных сверхпроводников Y-Ba-Cu-O [Текст] / С. В. Семенов, Д. А. Балаев, М. И. Петров // Физ. тверд. тела. - 2021. - Т. 63 Вып. 7. - С. 854-865

Держатели документа:
Russian Acad Sci, Krasnoyarsk Sci Ctr, Kirensky Inst Phys, Siberian Branch, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Krasnoyarsk 660041, Russia.

Доп.точки доступа:
Balaev, D. A.; Балаев, Дмитрий Александрович; Petrov, M. I.; Петров, Михаил Иванович; Семёнов, Сергей Васильевич
}
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