Evidence for weak link and anisotropy limitations on the transport critical current in bulk polycrystalline Y1Ba2Cu3O<i>x</i>

Ekin, John W.; Braginski, A. I.; Panson, A. J.; Janocko, M. A.; Capone, D. W.; Zaluzec, Nestor J.; Flandermeyer, B. K.; Lima, Orlando Fontes; Hong, M.; Kwo, J.; Liou, Sy‐Hwang

doi:10.1063/1.338985

Cited by 313 publications

(27 citation statements)

References 23 publications

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“…5 ) by more than two orders of magnitude between 0 and 8 mT. This behaviour can be interpreted as follows : at low magnetic field the transport critical current in polycrystalline YBaCuO is mainly determined by weak-link regions separating high-Jc regions in the material [8]. In favour of this assumption we can note that the critical current density does not depend on the field direction in the low field region in agreement with an intergrain Josephson behaviour.…”

Section: Resultssupporting

confidence: 66%

Statistical Studies of the Anisotropy of the Pinning Mechanism in YBaCuO Films Deposited on Polycrystalline YSZ Substrates

1996

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Abstract.We have studied the I-V characteristics and the behaviour of the critical current density of Y B a 2 C~3 0 7 .~ films, prepared by sputtering, at different values of applied magnetic field and of temperature. The superconductor was deposited onto polycrystalline Zr02 (8 mol % Y2O3). The I-V characteristics were obtained by using a short current pulse measurement technique in order to avoid heating phenomena. We have used a theoretical model to describe the I-V characteristics, based on a statistical treatment of the motion of vortices in an arbitrary pinning potential. Besides the determination of the critical current density Jc, this model allows to characterise the pinning sites by a function giving their energetic distribution. In this way we have been able to make a clear distinction between intrinsic and extrinsic pinning in sputtered Y B a 2 C~3 0 7 .~ films.

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Section: Resultssupporting

confidence: 66%

Statistical Studies of the Anisotropy of the Pinning Mechanism in YBaCuO Films Deposited on Polycrystalline YSZ Substrates

1996

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“…In particular, a picture of superconducting grains connected by "weak links" is the usual explanation for the broad, twostep transition 5 as well as the small criticai currents 6 (i) The temperature derivative of the resistivity presents two peaks, a feature that is consistent with the occurrence of a two-step transition in a granular system. The position of the higher-temperature peak (in general the sharpest one) is interpreted as the criticai temperature T ct at which a superconducting state is established inside the grains, while long-range order does not set in until the lower zero-resistance temperature T co is reached.…”

Section: Introductionmentioning

confidence: 59%

Fluctuation conductivity of inhomogeneous superconductors: A fractal aggregation model

Gusmo

Mors

1990

Phys. Rev. B

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“…Thus, the cause of the low J c of the sintered body was explained in view of the weak link between grains at grain boundaries. Experimental evidence of weak link behavior has been demonstrated by Ekin et al [3]. These weak link phenomena suggest that polycrystalline material such as the sintered body is unsuitable and that single crystals or sharply oriented materials are indispensable for high J c…”

Section: History Of Qmg and Qmg Bulk Magnetsmentioning

confidence: 90%

History and recent progress of QMG™ and QMG bulk magnets

Morita

2018

J. Phys.: Conf. Ser.

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Abstract. The microstructure of QMG consists of a single crystal REBa 2 Cu 3 O x phase and fine RE 2 BaCuO 5 particles. Y-based QMG was first produced in 1988 by the Quench and Melt Growth method. A bulk magnet made from QMG was proposed in 1989. QMG bulk magnets were realized by enlargement technology using RE substitute seed crystals. Based on these technological innovations, the development of NMR and MDDS, which are product-based applications of bulk magnets, has recently been reported from the research institutes of applied development. The history of the initial development of these QMG materials and QMG bulk magnets was reviewed. In addition, as progress of the recent QMG bulk magnet development, a new reinforcement method for large ring bulk magnets that can trap 10 T class strong magnetic field magnetization has been reported. For high field magnetization, the reinforcement of bulk magnets is essential to prevent cracking due to large hoop force. Compared to the conventional reinforcement method using only the outer metal ring, the new reinforcement method has been developed using thin QMG rings and metal ring sheets as the composite material with the inner and outer metal rings. In the case of the QMG ring reinforced by the conventional method, cracking occurred at 10T magnetization. Whereas the QMG ring created by the new reinforcement method successfully trapped approximately 10 T.

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Evidence for weak link and anisotropy limitations on the transport critical current in bulk polycrystalline Y1Ba2Cu3Ox

Cited by 313 publications

References 23 publications

Statistical Studies of the Anisotropy of the Pinning Mechanism in YBaCuO Films Deposited on Polycrystalline YSZ Substrates

Statistical Studies of the Anisotropy of the Pinning Mechanism in YBaCuO Films Deposited on Polycrystalline YSZ Substrates

Fluctuation conductivity of inhomogeneous superconductors: A fractal aggregation model

History and recent progress of QMG™ and QMG bulk magnets

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