Magnetical Response and Mechanical Properties of High Temperature Superconductors, YBaCu3O7-X Materials

Roa, J.J.; Dias, F.T.; Segarra, M.

doi:10.5772/37766

Cited by 2 publications

(2 citation statements)

References 95 publications

(95 reference statements)

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“…Recently the PME was described in terms of a crossover between conventional Type-I and Type-II superconductors [45]. However, in spite of the numerous efforts [46,47], there isn't yet a consistent model to explain the data obtained at high magnetic fields where the paramagnetic moments increase with the magnetic field. Moreover a field limit for the occurrence of the HFPME is not predicted.…”

Section: Discussionmentioning

confidence: 99%

High-field paramagnetic Meissner effect up to 14 T in melt-textured YBa 2 Cu 3 O 7 – δ

Dias

Vieira

Wolff-Fabris

et al. 2016

Physica C: Superconductivity and its Applications

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We have performed magnetization experiments in a melt-textured YBa2Cu3O7-d (Y123) sample with Y2BaCuO5 (Y211) inclusions, under magnetic fields up to 14 T applied parallel or perpendicular to the ab plane. Magnetic anisotropy and paramagnetic moments were observed in both FC (field-cooling) and FCW (field-cooled warming) procedures and these features correspond to the so-called High-Field Paramagnetic Meissner Effect (HFPME). The HFPME effect increases monotonically as the magnetic field rises and a strong paramagnetic relaxation, toward increasing paramagnetic moment was additionally observed as a function of time. Microscopy analysis revealed a complex and correlated microstructure of the Y211 particles. These correlated defects are well known to cause strong flux pinning. Our results suggest a scenario of strong flux compression within weak or non-superconducting regions of the samples, developed as a consequence of the Meissner effect and assisted by strong flux pinning by the Y211 particles. This scenario is observed up to 14 T and clearly persists beyond. Highlights-A persistent paramagnetic Meissner effect up to 14 T.-The PME with a slight tendency to saturate in high magnetic fields.-Strong time effects causing a paramagnetic relaxation dependent on the cooling rate.

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Section: Discussionmentioning

confidence: 99%

High-field paramagnetic Meissner effect up to 14 T in melt-textured YBa 2 Cu 3 O 7 – δ

Dias

Vieira

Wolff-Fabris

et al. 2016

Physica C: Superconductivity and its Applications

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“…In addition, some previous studies have indicated a dependency of the measured hardness on force, which contradicts the fact that the elastic modulus is an intrinsic material property of each sample and should depend only on the composition of the material. In consequence, the results of previous studies have a high variability; the elastic modulus varies between 10 and 300 GPa and Vickers hardness between 0.5 and 20 GPa [6]. This variability is clearly affected significantly by the measuring technique and the quality of the sample microstructure [7].…”

Section: Introductionmentioning

confidence: 96%

Enhanced Mechanical Properties of Single-Domain YBCO Bulk Superconductors Processed With Artificial Holes

Hlásek

Huang

Esnoz-Larraya³

et al. 2019

IEEE Trans. Appl. Supercond.

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Single domain YBCO bulk superconductors were prepared using a conventional top-seeded melt growth (TSMG) technique. Artificial holes were introduced to the green sample prior to thermal processing using a bespoke "spiked" mould. Mechanical properties such as elastic modulus, Vickers hardness, compressive strength and tensile strength were measured and compared to the properties of a standard bulk. The presence of the holes the bulk microstructure was observed to limit porosity and lower the concentration of macro-cracks in the bulk microstructure, resulting in significantly enhanced mechanical properties of the bulk single grains. The elastic modulus of the perforated bulks was observed to exhibit an increase of more than 45% compared to the standard samples. Compressive and tensile strengths were also improved significantly in the samples containing artificial holes. Observed differences in Vickers hardness, on the other hand, were negligible. This could be due by the fact that the hardness is measured on a small surface area of the single grain sample, where the effect of lower porosity and lower concentration of macro-cracks is less relevant. The introduction of artificial holes to the bulk, single grain microstructure appears to be a very promising technology for the production of melt-textured bulk superconductors with enhanced mechanical properties.

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Magnetical Response and Mechanical Properties of High Temperature Superconductors, YBaCu3O7-X Materials

Cited by 2 publications

References 95 publications

High-field paramagnetic Meissner effect up to 14 T in melt-textured YBa 2 Cu 3 O 7 – δ

High-field paramagnetic Meissner effect up to 14 T in melt-textured YBa 2 Cu 3 O 7 – δ

Enhanced Mechanical Properties of Single-Domain YBCO Bulk Superconductors Processed With Artificial Holes

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