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Man'kov, Y. I.
Effect of conduction electrons on the law of approach to saturation of a metallic ferromagnet with surface pinning of the magnetic moment / Y. I. Man'kov // Phys. Solid State. - 1999. - Vol. 41, Is. 4. - P. 582-588, DOI 10.1134/1.1130829. - Cited References: 37 . - ISSN 1063-7834

РУБ Physics, Condensed Matter
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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Держатели документа:
Russian Acad Sci, Siberian Branch, LV Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
ИФ СО РАН
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Study of current-voltage characteristics of Bi-based high-temperature superconductors with fractal cluster structure / K. A. Shaykhutdinov [et al.] // Physica C. - 2006. - Vol. 435, Is. 1-2. - P. 19-22, DOI 10.1016/j.physc.2006.01.010. - Cited References: 18 . - ISSN 0921-4534

РУБ Physics, Applied
Рубрики:
NORMAL-PHASE
VORTEX MOTION
TRANSPORT
Кл.слова (ненормированные):
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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Держатели документа:
LV Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
AF Ioffe Phys Tech Inst, St Petersburg 194021, Russia
ИФ СО РАН
Kirensky Institute of Physics, 660036 Akademgorodok, Krasnoyarsk, Russian Federation
Ioffe Physical-Technical Institute, 194021 Polytechnicheskaya St., 26, St.-Petersburg, Russian Federation

Доп.точки доступа:
Shaykhutdinov, K. A.; Шайхутдинов, Кирилл Александрович; Balaev, D. A.; Балаев, Дмитрий Александрович; Gokhfeld, D. M.; Гохфельд, Денис Михайлович; Kuzmin, Y. I.; Popkov, S. I.; Попков, Сергей Иванович; Petrov, M. I.; Петров, Михаил Иванович; International Workshop on Weak Superconductivity(2005 ; Sept. ; 16-19 ; Bratislava, Slovakia)
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Enhancement of pinning in cerium doped Y(1-x)CexBa2Cu3O7HTSC / M. I. Petrov [et al.] // Physica C. - 2007. - Vol. 460: 8th International Conference on Materials and Mechanisms of Superconductivity and High Temperature Superconductors (JUL 09-14, 2006, Dresden, GERMANY). - P. 1192-1193, DOI 10.1016/j.physc.2007.04.046. - Cited References: 2 . - ISSN 0921-4534

РУБ Physics, Applied

Кл.слова (ненормированные):
HTSC -- YBCO -- Ce doped -- flux pinning -- Ce doped -- Flux pinning -- HTSC -- YBCO -- Cerium -- Doping (additives) -- Flux pinning -- Lattice constants -- Magnetization -- Yttrium compounds -- Cerium ions -- Diamagnetic responses -- Temperature dependence -- High temperature superconductors
Аннотация: To test the pinning force in high-temperature superconductors with minor doping, the Y(1-x)CexBa2Cu3O7 system has been synthesized. Temperature dependence of magnetization has been determined. The difference of diamagnetic responses M(zfc) - M(fc) is non-monotonic. It has a peak at a concentration value x = 0.0156, which corresponds to the most probable distance between cerium ions equal to eight lattice constants in the a-b plane and close to the diameter of vortices. (c) 2007 Elsevier B.V. All rights reserved.

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Держатели документа:
LV Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
ИФ СО РАН
Kirensky Institute of Physics, 660036 Krasnoyarsk, Russian Federation

Доп.точки доступа:
Petrov, M. I.; Петров, Михаил Иванович; Balaev, D. A.; Балаев, Дмитрий Александрович; Gokhfeld, Yu. S.; Гохфельд, Юлия Сергеевна; Dubrovskiy, A. A.; Дубровский, Андрей Александрович; Shaykhutdinov, K. A.; Шайхутдинов, Кирилл Александрович
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Magnetic field dependence of intergrain pinning potential in bulk granular composites YBCO plus CuO demonstrating large magneto-resistive effect / D. A. Balaev [et al.] // J. Supercond. Nov. Magn. - 2008. - Vol. 21, Is. 4. - P. 243-247, DOI 10.1007/s10948-008-0324-1. - Cited References: 22 . - ISSN 1557-1939

РУБ Physics, Applied + Physics, Condensed Matter
Рубрики:
HIGH-TEMPERATURE SUPERCONDUCTORS
   ACTIVATED PHASE-SLIP
   TRANSITION
   DISSIPATION
   MECHANISM
   SENSORS
   MODEL
Кл.слова (ненормированные):
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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Держатели документа:
[Balaev, D. A.
Dubrovskiy, A. A.
Popkov, S. I.
Shaykhutdinov, K. A.
Petrov, M. I.] RAS, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
ИФ СО РАН
Kirensky Institute of Physics of RAS, 660036, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Balaev, D. A.; Балаев, Дмитрий Александрович; Dubrovskiy, A. A.; Дубровский, Андрей Александрович; Popkov, S. I.; Попков, Сергей Иванович; Shaykhutdinov, K. A.; Шайхутдинов, Кирилл Александрович; Petrov, M. I.; Петров, Михаил Иванович
}
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Peculiarities of the time evolution of magnetoresistance of granular HTSC in a constant applied magnetic field / D. A. Balaev [et al.] // Solid State Commun. - 2008. - Vol. 147, Is. 7-8. - P. 284-287, DOI 10.1016/j.ssc.2008.05.044. - 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. . - ISSN 0038-1098

РУБ Physics, Condensed Matter
Рубрики:
CRITICAL-STATE
   SUPERCONDUCTORS
   COMPOSITES
   HYSTERESIS
   RESISTANCE
Кл.слова (ненормированные):
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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Держатели документа:
[Balaev, D. A.
Dubrovskiy, A. A.
Shaykhutdinov, K. A.
Popkov, S. I.
Petrov, M. I.] LV Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
ИФ СО РАН
Kirensky Institute of Physics, 660036 Krasnoyarsk, Russian Federation

Доп.точки доступа:
Balaev, D. A.; Балаев, Дмитрий Александрович; Dubrovskiy, A. A.; Дубровский, Андрей Александрович; Shaykhutdinov, K. A.; Шайхутдинов, Кирилл Александрович; Popkov, S. I.; Попков, Сергей Иванович; Petrov, M. I.; Петров, Михаил Иванович
}
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Pinning enhancement by heterovalent substitution in Y1−xRExBa2Cu3O7−δ [Текст] / M. I. Petrov, Yu. S. Gokhfeld [и др.] // Supercond. Sci. Technol. - 2008. - Vol. 21. - С. 085015

Доп.точки доступа:
Petrov, M.I.; Gokhfeld, Yu.S.; Balaev, D.A.; Popkov, S.I.; Dubrovskiy, A.A.; Gokhfeld, D.M.; Shaykhutdinov, K.A.
}
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Pinning enhancement by heterovalent substitution in Y1−xRExBa2Cu3O7−δ [Текст] / M. I. Petrov, Yu. S. Gokhfeld [и др.] // arXiv. - 2008. - Ст. 0803.0795

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Доп.точки доступа:
Petrov, M.I.; Gokhfeld, Yu.S.; Balaev, D.A.; Popkov, S.I.; Dubrovskiy, A.A.; Gokhfeld, D.M.; Shaykhutdinov, K.A.
}
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Magnetization asymmetry of type-II superconductors in high magnetic fields / D. M. Gokhfeld [et al.] // J. Appl. Phys. - 2011. - Vol. 109, Is. 3. - Ст. 33904, DOI 10.1063/1.3544038. - 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. . - ISSN 0021-8979

РУБ Physics, Applied
Рубрики:
HIGH-TEMPERATURE SUPERCONDUCTORS
   CRITICAL-STATE MODEL
   CRITICAL-CURRENT DENSITIES
   SURFACE-BARRIER
   TRANSPORT
Кл.слова (ненормированные):
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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Держатели документа:
[Gokhfeld, D. M.
Balaev, D. A.
Petrov, M. I.
Popkov, S. I.
Shaykhutdinov, K. A.
Val'kov, V. V.] LV Kirensky Inst Phys SB RAS, Krasnoyarsk 660036, Russia
ИФ СО РАН
L. V. Kirensky Institute of Physics SB RAS, Akademgorodok 50/38, Krasnoyarsk 660036, Russian Federation

Доп.точки доступа:
Gokhfeld, D. M.; Гохфельд, Денис Михайлович; Balaev, D. A.; Балаев, Дмитрий Александрович; Petrov, M. I.; Петров, Михаил Иванович; Popkov, S. I.; Попков, Сергей Иванович; Shaykhutdinov, K. A.; Шайхутдинов, Кирилл Александрович; Val'kov, V. V.; Вальков, Валерий Владимирович
}
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Pinning in a porous high-temperature superconductor Bi2223 / K. Y. Terent'ev [et al.] // Phys. Solid State. - 2011. - Vol. 53, Is. 12. - P. 2409-2414, DOI 10.1134/S1063783411120250. - 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. . - ISSN 1063-7834

РУБ Physics, Condensed Matter
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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Держатели документа:
[Terent'ev, K. Yu.
Gokhfel'd, D. M.
Popkov, S. I.
Shaikhutdinov, K. A.
Petrov, M. I.] Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Branch of the Russian Academy of Sciences, Akademgorodok 50-38, Krasnoyarsk 660036, Russian Federation

Доп.точки доступа:
Terent'ev, K. Yu.; Терентьев, Константин Юрьевич; Gokhfel'd, D. M.; Гохфельд, Денис Михайлович; Popkov, S. I.; Попков, Сергей Иванович; Shaikhutdinov, K. A.; Шайхутдинов, Кирилл Александрович; Petrov, M. I.; Петров, Михаил Иванович
}
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10.

Contributions from Inter-grain Boundaries to the Magneto-resistive Effect in Polycrystalline High-T (C) Superconductors. The Underlying Reason of Different Behavior for YBCO and BSCCO Systems / D. A. Balaev [et al.] // J. Supercond. Nov. Magn. - 2011. - Vol. 24, Is. 7. - P. 2129-2136, DOI 10.1007/s10948-011-1166-9. - Cited References: 30. - This work is supported by program N5 of RAS, project N7. . - ISSN 1557-1939

РУБ Physics, Applied + Physics, Condensed Matter
Рубрики:
HIGH-TEMPERATURE SUPERCONDUCTORS
   PHASE-SLIP
   TRANSPORT-PROPERTIES
   TRANSITION
   FIELD
   COMPOSITES
   BULK
   TAPES
   YBA2CU3O7-DELTA
   DISSIPATION
Кл.слова (ненормированные):
BSCCO -- YBCO -- Intergrain boundaries -- Magnetoresistance -- BSCCO -- Intergrain boundaries -- Magnetoresistance -- YBCO -- BSCCO -- BSCCO system -- Comparative studies -- High Tc superconductors -- High-field -- Inter-grain -- Irreversibility lines -- Magneto-resistive effect -- Polycrystalline -- Resistive transition -- Standard measurements -- Weak pinning -- YBCO -- Bismuth -- Electric resistance -- Grain boundaries -- High temperature superconductors -- Lead -- Magnetic fields -- Magnetoelectronics -- Magnetoresistance -- Magnetos -- Superconductivity -- Yttrium barium copper oxides -- Semiconductor metal boundaries
Аннотация: In order to clarify the mechanisms in charge of broadening of resistive transition R(T) in magnetic fields of bismuth-based polycrystalline high-T (C) superconductor (HTSC), a comparative study of Bi1.8Pb0.3Sr1.9Ca2Cu3O (x) (BSCCO) and YBa2Cu3O7-delta (YBCO) have been performed. Magnetoresistive effects and irreversibility line obtained from magnetic measurements have been studied. It was established that (1) for YBCO, the smooth part of R(T) dependence unambiguously corresponds to dissipation in the intergrain boundaries for arbitrary magnetic fields; (2) for polycrystalline BSCCO, the smooth part of R(T) dependences correspond to dissipation within intergrain boundary subsystem in the field range H <10(2) Oe only, while standard measurements of R(T) dependences in magnetic field range H > 10(2) Oe reflect the dissipation processes occurring both in intergrain boundary and HTSC grain subsystems; (3) for the high-field range, the contribution from intergrain boundaries of BSCCO can be distinguished from magnetoresistance R(H) dependences obtained at high enough current density on textured samples. It is proposed that various magneto-resistive properties of these classical HTSC systems are due comparatively weak pinning in BSCCO.

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Держатели документа:
[Balaev, D. A.
Popkov, S. I.
Semenov, S. V.
Bykov, A. A.
Dubrovskiy, A. A.
Shaikhutdinov, K. A.
Petrov, M. I.] LV Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
[Balaev, D. A.
Popkov, S. I.
Sabitova, E. I.
Dubrovskiy, A. A.
Shaikhutdinov, 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; Sabitova, E. I.; Dubrovskiy, A. A.; Дубровский, Андрей Александрович; Shaikhutdinov, K. A.; Шайхутдинов, Кирилл Александрович; Petrov, M. I.; Петров, Михаил Иванович
}
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