Enhanced critical currents by CeO2 additions in directionally solidified YBa2Cu3O7

Piñol, S.; Sandiumenge, F.; Martı́nez, B.; Gomis, V.; Fontcuberta, J.; Obradors, X.; Snoeck, E.; Roucau, C.

doi:10.1063/1.112011

Cited by 142 publications

(87 citation statements)

References 8 publications

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“…Almost the same effect has been reported in CeO 2 added YBCO [12]. It is worth mentioning that the size refinement of Y-211 is an increase in the nucleation site for Y-211.…”

Section: -3 Coarsening Of (Lre)-211 Particlessupporting

confidence: 63%

“…Here the addition of Pt (typically 0.1-0.5 wt.%) to the precursor powder is very effective for refinement of Y-211 in the liquid, which led to fine dispersion of Y-211 particle in the Y-123 superconducting matrix, hence high J c [11]. CeO 2 powder has been also used instead of Pt for cost-effective production [12]. The effect of Pt addition to the precursor pellet on microstructures will be discussed later.…”

Section: -2 Top-seeded Melt Growth (Tsmg) Processmentioning

confidence: 99%

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Nanocomposite RE-Ba-Cu-O Bulk Superconductors

Iida

2015

Oxide Thin Films, Multilayers, and Nanocomposites

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Nanocomposite oxide high-temperature bulk superconductors can be used as "quasi-magnets". Thanks to the recent progress of material processing, "quasi-magnet" with 26 mm diameter can generate a large field of 17.6 T at 26 K. These results are highly attractive for applications, involving levitation of permanent magnets on the bulk superconductors. Indeed, several other applications such as motors and magnetic resonance microscope using bulk superconductors have been proposed and demonstrated. In this chapter, we describe several techniques to improve the magnetic properties for bulk superconductors together with some basics such as phase diagrams and solidifications.

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“…Almost the same effect has been reported in CeO 2 added YBCO [12]. It is worth mentioning that the size refinement of Y-211 is an increase in the nucleation site for Y-211.…”

Section: -3 Coarsening Of (Lre)-211 Particlessupporting

confidence: 63%

Section: -2 Top-seeded Melt Growth (Tsmg) Processmentioning

confidence: 99%

Nanocomposite RE-Ba-Cu-O Bulk Superconductors

Iida

2015

Oxide Thin Films, Multilayers, and Nanocomposites

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“…Magnetic fields up to H = 50 kOe were applied parallel and perpendicular to the c-axis. The melttextured YBaCuO sample was prepared by top-seeding technique [7], with 25 wt.% of Y 2 BaCuO 5 (Y211), and the single crystalline YCaBaCuO sample was grown by the self-flux method [8]. The magnetization measurements were done with a Quantum Design SQUID magnetometer.…”

Section: Introductionmentioning

confidence: 99%

Paramagnetic Meissner effect at high fields in YCaBaCuO single crystal and melt-textured YBaCuO

Dias

Vieira

Almeida

et al. 2010

Physica C: Superconductivity and its Applications

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a b s t r a c tWe report on systematic field-cooled magnetization experiments in an Y 0.98 Ca 0.02 Ba 2 Cu 3 O 7Àd single crystal and melt-textured YBa 2 Cu 3 O 7Àd samples. Magnetic fields up to 50 kOe were applied and a paramagnetic response related to the superconducting state was observed. We discuss our results in terms of the flux compression scenario into the sample.Ó 2010 Elsevier B.V. All rights reserved.The paramagnetic Meissner effect (PME) was first observed in polycrystalline samples of the high-T C superconductors (HTSC) [1]. The effect is attributed to the occurrence of a net paramagnetic moment when the materials are cooled through T C in the presence of low and high magnetic fields. This unusual effect seems to be superimposed to the conventional diamagnetism. Several models and explanations have been proposed. The PME has been attributed to spontaneous orbital currents which should occur in granular networks, where p junctions are randomly distributed [2], sample geometry and surface [3], nonequilibrium compressed flux states stabilized by inhomogeneous cooling [4], the formation of a giant vortex on the sample surface [5], etc. Recently, the PME has been observed in YBaCuO/LaCaMnO superlattices [6].In this paper, we report on field-cooled-cooling (FCC) magnetization measurements as functions of the temperature in an Y 0.98 Ca 0.02 Ba 2 Cu 3 O 7Àd single crystal (YCaBaCuO) and melt-textured YBa 2 Cu 3 O 7Àd (YBaCuO) samples. Magnetic fields up to H = 50 kOe were applied parallel and perpendicular to the c-axis. The melttextured YBaCuO sample was prepared by top-seeding technique [7], with 25 wt.% of Y 2 BaCuO 5 (Y211), and the single crystalline YCaBaCuO sample was grown by the self-flux method [8]. The magnetization measurements were done with a Quantum Design SQUID magnetometer. The SQUID signal and the sample centering were monitored during the experimental runs. Magnetic fields up to 50 kOe were applied either parallel or perpendicular to the ab plane in both samples. The results were corrected for the demagnetizing factor and the spin contribution from the Y211 particles was subtracted from the raw data in melt-textured sample. Fig. 1 shows the FCC magnetization measurements for the YCaBaCuO single crystalline sample in fields between 0.01 and 50 kOe applied parallel to the c-axis. In Fig. 1 we observe that, at the lowest applied field, the moment is diamagnetic, but the diamagnetism decreases when the field is augmented. When the field magnitude reaches about 5 kOe the magnetic moment shows a sign reversal. For higher fields, the FC magnetization becomes increasingly positive, as illustrated by results obtained at H = 50 kOe. A small diamagnetic dip always occurs nearly below T C in experiments performed in this field range. The experiments were repeated and the results were confirmed. Similar results were obtained when the magnetic field was applied parallel to the ab plane. Fig. 2 shows the FCC magnetization measurements for the melt-textured YBaCuO sample in fields between 0.05 and 50 k...

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“…These sample types are referred as "NN", "NT", "TN" and "TT", where the first and second letters represent the manufacturers of the Y-123 and Y-211 precursor powders, respectively. All powder mixtures consisted, by weight, of 70 wt% Y-123 and 30 wt% Y-211 and an excess of 1.0 wt% cerium oxide (purity 99.9%, supplied by Alfa Aesar), CeO 2 , which inhibits the coarsening of Y-211 particles during melt processing and limits their size in the fully processed sample microstructure [20][21][22][23][24].…”

Section: Sample Productionmentioning

confidence: 99%