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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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Time relaxation of residual resistance of HTSC-based composites / D. A. Balaev [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. 1309-1310, DOI 10.1016/j.physc.2007.03.347. - Cited References: 5 . - ISSN 0921-4534

РУБ Physics, Applied
Рубрики:
SUPERCONDUCTORS
Кл.слова (ненормированные):
granular HTSC -- resistance -- relaxation -- magnetic flux -- Granular HTSC -- Magnetic flux -- Relaxation -- Resistance -- Copper oxides -- Crystallites -- Magnetic flux -- Magnetic relaxation -- Magnetization -- Yttrium barium copper oxides -- Anderson-like relaxation processes -- Flux trapping -- Residual resistance -- Time relaxation -- Josephson junction devices
Аннотация: Magnetoresistance curves R(H) and time relaxation of the residual resistance of bulk YBCO + CuO composites have been studied. These composites represent the network of Josephson junctions, where CuO acts as a barrier between YBCO grains. It has been shown that hysteresis of the R(H) dependences is related to the flux trapping within the YBCO crystallites. This flux induces magnetic field in the intergrain media. Time relaxation of the residual resistance is caused by relaxation of the magnetization of YBCO grains. The time dependence of the residual resistance obeys a logarithmic law, which describes the Anderson-like relaxation processes in the YBCO grains. (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, Krasnoyarsk, 660036, 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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Time relaxation of residual resistance of HTSC-based composites / D. A. Balaev [et al.] // Physica C-Superconductivity and its Applications. - 2007. - Т.460-462 II, spec. iss. - P. 1309-1310, DOI 10.1016/j.physc.2007.03.347 . - ISSN 0921-4534

РИНЦ
Держатели документа:
Kirensky Institute of Physics

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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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.] // 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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The effect of magnetization relaxation of superconducting grains on time evolution of the resistance of granular HTSC in constant applied magnetic field / Dubrovskiy A.A., Balaev D.A., Shaykhutdinov K.A., Popkov S.I., Petrov M.I. // 25 International conftrence on low temperature physics. - 2008. - P298

Доп.точки доступа:
Dubrovskiy, A. A.; Дубровский, Андрей Александрович; Balaev, D. A.; Балаев, Дмитрий Александрович; Shaykhutdinov, K. A.; Шайхутдинов, Кирилл Александрович; Popkov, S. I.; Попков, Сергей Иванович; Petrov, M. I.; Петров, Михаил Иванович; International Conference on Low Temperature Physics(25 ; 2008 ; Aug. 6-13 ; Amsterdam, Netherlands)
}
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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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Magnetoresistance of granular superconductors in magnetic field / A. A. Dubrovskiy, D. A. Balaev, K. A. Shaykhutdinov [et al.] // 18th International Conference on Magnetism (ICM-2009). - 2009. - P. 117

Доп.точки доступа:
Dubrovskiy, A. A.; Дубровский, Андрей Александрович; Balaev, D. A.; Балаев, Дмитрий Александрович; Shaykhutdinov, K. A.; Шайхутдинов, Кирилл Александрович; Popkov, S. I.; Попков, Сергей Иванович; Petrov, M. I.; Петров, Михаил Иванович; International Conference on Magnetism(18 ; 2009 ; July 26-31 ; Karlsruhe, Germany)
}
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10.

Magnetoresistance hysteresis in a polycrystalline (La0.5Eu0.5)0.7Pb0.3MnO3 manganite at low temperatures / S. V. Semenov, K. A. Shaykhutdinov [et al.] // 18th International Conference on Magnetism (ICM-2009). - 2009. - Ст. Mo-A-5.1-03

Доп.точки доступа:
Semenov, S.V.; Shaykhutdinov, K.A.; Popkov, S.I.; Balaev, A.D.; Dubrovskiy, A.A.; Sablina, K.A.; Volkov, N.V.; International Conference on Magnetism(18 ; 2009 ; July 26-31 ; Karlsruhe, Germany)
}
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