Investigation of DyBa2Cu3O7−d superconducting domains grown by the infiltration technique starting with small size Dy-211 particles

Crossed-magnetic-field effects on bulk high-temperature superconductors have been studied both experimentally and numerically. The sample geometry investigated involves finite-size effects along both ͑crossed-͒ magnetic-field directions. The experiments were carried out on bulk melt-processed Y-Ba-Cu-O single domains that had been premagnetized with the applied field parallel to their shortest direction ͑i.e., the c axis͒ and then subjected to several cycles of the application of a transverse magnetic field parallel to the sample ab plane. The magnetic properties were measured using orthogonal pickup coils, a Hall probe placed against the sample surface, and magneto-optical imaging. We show that all principal features of the experimental data can be reproduced qualitatively using a two-dimensional finite-element numerical model based on an E-J power law and in which the current density flows perpendicularly to the plane within which the two components of magnetic field are varied. The results of this study suggest that the suppression of the magnetic moment under the action of a transverse field can be predicted successfully by ignoring the existence of flux-free configurations or flux-cutting effects. These investigations show that the observed decay in magnetization results from the intricate modification of current distribution within the sample cross section. The current amplitude is altered significantly only if a field-dependent critical current density J c ͑B͒ is assumed. Our model is shown to be quite appropriate to describe the cross-flow effects in bulk superconductors. It is also shown that this model does not predict any saturation of the magnetic induction, even after a large number ͑ϳ100͒ of transverse field cycles. These features are shown to be consistent with the experimental data.

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“…[45][46][47][48]. The as-grown samples were cylindrical with a typical diameter of 20 mm and thickness of 10 mm ͑i.e., parallel to the c axis͒.…”

Section: A Sample Preparation and Characterizationmentioning

confidence: 99%

Behavior of bulk high-temperature superconductors of finite thickness subjected to crossed magnetic fields: Experiment and model

et al. 2007

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“…Such macrocracks were observed on the top surface of the drilled bulk before the measurement sequence. However, these cracks could have been extended by mechanical stresses during the field cooled procedure [18]. In the present case, the average J c degradation introduced by such cracks and estimated from the maximum value of the trapped induction is less than 50%.…”

Section: Initial Trapped Flux: Heater Offmentioning

confidence: 65%

“…Y-Ba-Cu-O single-domain foams (III) were prepared by the infiltration and growth process [18]. First a polyurethane skeleton of 80 ppi (pores per inch) was coated with a Y-211 slurry.…”

Section: Sample Preparationmentioning

confidence: 99%

Study by Hall probe mapping of the trapped flux modification produced by local heating in YBCO HTS bulks for different surface/volume ratios

Laurent

Mathieu

Mattivi

et al. 2005

Supercond. Sci. Technol.

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The aim of this report is to compare the trapped field distribution under a local heating created at the sample edge for different sample morphologies. Hall probe mappings of the magnetic induction trapped in YBCO bulk samples maintained out of thermal equilibrium were performed on YBCO bulk single domains, YBCO single domains with regularly spaced hole arrays, and YBCO superconducting foams. The capability of heat draining was quantified by two criteria: the average induction B decay and the size of the thermally affected zone caused by a local heating of the sample. Among the three investigated sample shapes, the drilled single domain displays a trapped induction which is weakly affected by the local heating while displaying a high trapped field. Finally, a simple numerical modelling of the heat flux spreading into a drilled sample is used to suggest some design rules about the hole configuration and their size.

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“…R ecently , the infiltration and growth (IG) process, used for fabrication of single‐domain (here, a single domain is defined as a quasi‐single‐crystal containing many imperfections or defects) RE–Ba–Cu–O (REBCO) bulks, is attracting considerable attention because of its advantages compared with the conventional melt growth method, such as fewer pores, cracks and distortions, insignificant shrinkage in the final products, especially the homogeneous distribution of fine RE 2 BaCuO 5 (RE‐211) particles in the REBa 2 Cu 3 O 7− x (RE‐123) matrix 1–9 . For this process, as schematically shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

A Novel Configuration for Infiltration and Growth of Single‐Domain Gd–Ba–Cu–O Bulk Superconductor

Yang

2010

Journal of the American Ceramic Society

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A novel configuration was developed and then used for infiltration and growth (IG) of single‐domain Gd–Ba–Cu–O (GdBCO) bulk superconductor. The morphology, microstructure, and superconducting property of the GdBCO product were investigated. It is found that, the novel configuration can increase the stability of the sample during the IG process at high temperature, and can also contribute to the complete growth of the whole bulk. The results are helpful to increase the stability and repeatability of the experiments.

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Investigation of DyBa₂Cu₃O_7−d superconducting domains grown by the infiltration technique starting with small size Dy-211 particles

Cited by 20 publications

References 28 publications

Behavior of bulk high-temperature superconductors of finite thickness subjected to crossed magnetic fields: Experiment and model

Behavior of bulk high-temperature superconductors of finite thickness subjected to crossed magnetic fields: Experiment and model

Study by Hall probe mapping of the trapped flux modification produced by local heating in YBCO HTS bulks for different surface/volume ratios

A Novel Configuration for Infiltration and Growth of Single‐Domain Gd–Ba–Cu–O Bulk Superconductor

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