Critical Current Density Obtained from Particle Size Dependence of Magnetization in Y1Ba2Cu3O7-δ Powders

Shimizu, Eriko; Ito, Daisuke

doi:10.1007/978-4-431-68084-0_76

Cited by 7 publications

(3 citation statements)

References 6 publications

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“…The values in nanocrystalline materials are of the order 10 -4 -10 -3 . Such a decrease of m D D M B 0 has been reported in other small grained materials [55]. These values are outside the scope of Bean's model and can be indicative of surface pinning in the grains [53], consistent with the asymmetry of the hysteresis loops.…”

Section: Magnetic Hysteresissupporting

confidence: 77%

The cause of ‘weak-link’ grain boundary behaviour in polycrystalline Bi₂Sr₂CaCu₂O₈and Bi₂Sr₂Ca₂Cu₃O₁₀superconductors

Wang

Raine

Hampshire

2018

Supercond. Sci. Technol.

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Publisher's copyright statement:Original content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. Manuscript version: Accepted Manuscript Accepted Manuscript is "the version of the article accepted for publication including all changes made as a result of the peer review process, and which may also include the addition to the article by IOP Publishing of a header, an article ID, a cover sheet and/or an 'Accepted Manuscript' watermark, but excluding any other editing, typesetting or other changes made by IOP Publishing and/or its licensors"This Accepted Manuscript is © 2017 IOP Publishing Ltd.As the Version of Record of this article is going to be / has been published on a gold open access basis under a CC BY 3.0 licence, this Accepted Manuscript is available for reuse under a CC BY 3.0 licence immediately.Everyone is permitted to use all or part of the original content in this article, provided that they adhere to all the terms of the licence https://creativecommons.org/licences/by/3.0Although reasonable endeavours have been taken to obtain all necessary permissions from third parties to include their copyrighted content within this article, their full citation and copyright line may not be present in this Accepted Manuscript version. Before using any content from this article, please refer to the Version of Record on IOPscience once published for full citation and copyright details, as permissions may be required. All third party content is fully copyright protected and is not published on a gold open access basis under a CC BY licence, unless that is specifically stated in the figure caption in the Version of Record.View the article online for updates and enhancements. AbstractThe detrimental effects of grain boundaries have long been considered responsible for the low critical current densities ( c ) in high temperature superconductors. In this paper, we apply the quantitative approach used to identify the cause of the 'weak-link' grain boundary behaviour in YBa2Cu3O7 [1], to the Bi2Sr2CaCu2O8 and Bi2Sr2Ca2Cu3O10 materials that we have fabricated. Magnetic and transport measurements are used to characterise the grain and grain boundary properties of micro-and nanocrystalline material. Magnetisation measurements on all nanocrystalline materials show non-Bean-like behaviour and are consistent with sur...

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Section: Magnetic Hysteresissupporting

confidence: 77%

The cause of ‘weak-link’ grain boundary behaviour in polycrystalline Bi₂Sr₂CaCu₂O₈and Bi₂Sr₂Ca₂Cu₃O₁₀superconductors

Wang

Raine

Hampshire

2018

Supercond. Sci. Technol.

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“…m D D derived from data similar to that in figure 16 are typically 3 orders of magnitude smaller. These small values, compiled in table 2, have been found in the work of Shimizu and Ito [65] and cannot be explained by bulk pinning using Bean's model. We attribute the low values to the c Transport J c of Y1HA sample (shown in the lower panel) and YBCO commercial tape data are also included for comparison [13].…”

Section: Magnetic Hysteresismentioning

confidence: 51%

How resistive must grain boundaries in polycrystalline superconductors be, to limitJ_c?

Wang

Raine

Hampshire

2017

Supercond. Sci. Technol.

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Although we can use misorientation angle to distinguish the grain boundaries that can carry high critical current density in high temperature superconductors (HTS) from those that cannot, there is no established normal state property equivalent. In this paper, we explore the superconducting and normal state properties of the grains and grain boundaries of polycrystalline YBa2Cu3O7−x (YBCO) using complementary magnetisation and transport measurements, and calculate how resistive grain boundaries must be to limit in polycrystalline superconductors. The average resistivity of the grain boundaries, in our micro- and nanocrystalline YBCO are 0.12 Ωm and 8.2 Ωm, values which are much higher than that of the grains and leads to huge values of 2 × 103 and 1.6 × 105 respectively. We find that the grain boundaries in our polycrystalline YBCO are sufficiently resistive that we can expect the transport to be several tens of orders of magnitude below the potential current density of the grains in our YBCO samples, as is found experimentally. Calculations presented show that increasing values by ∼2 orders of magnitude in high fields is still possible in all state-of-the-art technological high-field superconductors. We conclude: grain boundary engineering is unlikely to improve sufficiently in randomly aligned polycrystalline YBCO, to make it technologically useful for high-field applications; in low temperature superconducting intermetallics, such as Nb3Sn, large increases in may be achieved by completely removing the grain boundaries from these materials and, as is the case for thin films of Nb, Ba(FeCo)2As2 and HTS materials, by incorporating additional artificial pinning.

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“…A superconductor dominated by planar defects in the flux pinning effect can be called a planar defect-dominating superconductor. High T c superconductor (HTSC) bulks are associated in this category [6][7][8][9].…”

mentioning

confidence: 99%

Delta H = Delta B region in volume defect-dominating superconductor

Lee,

Kim,

Park

et al. 2018

Preprint

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It has been generally accepted that the diamagnetic property of type II superconductor decreases after H c1 . On the other hand, we found that (Fe, Ti) particle-doped MgB 2 specimens have a ∆H = ∆B region in the M-H curves, which is the region that the increase of a magnetic induction is as much as the increase of an applied magnetic field. Here we study whether this phenomenon was only confined to (Fe, Ti) particle-doped MgB 2 superconductor, whether there is a theoretical basis, and why it does not appear in other superconductors. The cause of the ∆H = ∆B region

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Critical Current Density Obtained from Particle Size Dependence of Magnetization in Y1Ba2Cu3O7-δ Powders

Cited by 7 publications

References 6 publications

The cause of ‘weak-link’ grain boundary behaviour in polycrystalline Bi₂Sr₂CaCu₂O₈and Bi₂Sr₂Ca₂Cu₃O₁₀superconductors

The cause of ‘weak-link’ grain boundary behaviour in polycrystalline Bi₂Sr₂CaCu₂O₈and Bi₂Sr₂Ca₂Cu₃O₁₀superconductors

How resistive must grain boundaries in polycrystalline superconductors be, to limitJ_c?

Delta H = Delta B region in volume defect-dominating superconductor

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Critical Current Density Obtained from Particle Size Dependence of Magnetization in Y1Ba2Cu3O7-δ Powders

Cited by 7 publications

References 6 publications

The cause of ‘weak-link’ grain boundary behaviour in polycrystalline Bi2Sr2CaCu2O8and Bi2Sr2Ca2Cu3O10superconductors

The cause of ‘weak-link’ grain boundary behaviour in polycrystalline Bi2Sr2CaCu2O8and Bi2Sr2Ca2Cu3O10superconductors

How resistive must grain boundaries in polycrystalline superconductors be, to limitJc?

Delta H = Delta B region in volume defect-dominating superconductor

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The cause of ‘weak-link’ grain boundary behaviour in polycrystalline Bi₂Sr₂CaCu₂O₈and Bi₂Sr₂Ca₂Cu₃O₁₀superconductors

The cause of ‘weak-link’ grain boundary behaviour in polycrystalline Bi₂Sr₂CaCu₂O₈and Bi₂Sr₂Ca₂Cu₃O₁₀superconductors

How resistive must grain boundaries in polycrystalline superconductors be, to limitJ_c?