Impact of the Magnetic Flux Penetrating Vortex Core on the Critical Current of the HTc Superconductors

2010 ◽  
Vol 670 ◽  
pp. 28-37
Author(s):  
Jacek Sosnowski
Keyword(s):  
Magnetic Flux ◽  
Critical Current ◽  
Vortex Core ◽  
Quantum Effect ◽  
Electromagnetic Properties ◽  
New Model ◽  
Magnetic Vortices ◽  
Center Edge ◽  
Pinning Center ◽  
Htc Superconductors

New model of the capturing vortices in the HTc superconductors is presented, describing their electromagnetic properties, such as the critical current of these materials. Critical current of the superconductors, such as HTc tapes is dependent on the magnitude of the interaction magnetic vortices with pinning centers. This is in fact quantum effect since the magnetic flux in vortices is quantized. Capturing the vortices on the normal state nano-sized inclusions should lead to the modification of the flux distribution in the vortex core depending on the vortex position in the respect to the pinning center edge. These effects are considered in the paper and their influence on the critical current of the HTc materials, basing on the new model of the pinning interaction.

Magnetic Properties of CeO2 Doped YBCO Oxides

2007 ◽  
Vol 119 ◽  
pp. 319-322
Author(s):  
Sang Heon Lee
Keyword(s):  
Magnetic Flux ◽  
Weak Link ◽  
Magnetic Effect ◽  
Electromagnetic Properties ◽  
Ybco Superconductor ◽  
Pinning Centers ◽  
Electromagnetic Characteristics ◽  
Trapped Magnetic Flux ◽  
Pinning Center ◽  
Occurrence Mechanism

The electromagnetic characteristics in YBCO superconductor were studied. Electromagnetic properties of CeO2 doped and undoped YBCO superconductor was evaluated to investigate the effect of pinning center on the magnetization and magnetic shielding. It was confirmed experimentally that a large amount of magnetic flux was trapped in the CeO2 doped sample than that in the undoped one, indicating that the pinning centers of magnetic flux are related closely to the occurrence mechanism of the magnetic effect. It was concluded that the electromagnetic characteristics arose from the interaction between the trapped magnetic flux and weak link of the filament formed in the superconducting bulk.

scholarly journals New model of the pinning potential barrier in layered HTc superconductors

2016 ◽  
Vol 30 (31) ◽  
pp. 1650387 ◽  
Author(s):  
J. Sosnowski
Keyword(s):  
Critical Current ◽  
Potential Barrier ◽  
Transport Current ◽  
Fast Neutrons ◽  
Layered Superconductor ◽  
Geometrical Approach ◽  
New Model ◽  
Pinning Potential ◽  
Pancake Vortex ◽  
Htc Superconductors

New model of the pinning potential barrier in multilayered HTc superconductors is presented, based on geometrical approach to the capturing interaction of pancake-type vortices with nano-sized defects. Using the above model the transport current flow phenomena in these materials, especially the current–voltage characteristics and critical current density, have been considered. Details of theoretical analysis are given, including the derivation of basic mathematical equations describing the potential barrier as a function of transport current intensity and the initial position of captured pancake vortex. Computer simulation has been performed of the influence of transport current amplitude on the potential barrier height for various sizes of pinning centers and initial pancake vortex position as well as the influence of fast neutrons irradiation creating nano-sized defects on critical current of HTc layered superconductor.

Facet Topography and Dislocation Structure as a Possible Source for Electrical Heterogeneity in [001] TILT Bicrystals of YBa2Cu3O7-δ

1996 ◽  
Vol 54 ◽  
pp. 338-339
Author(s):  
I-Fei Tsu ◽  
D.L. Kaiser ◽  
S.E. Babcock
Keyword(s):  
Grain Boundary ◽  
Critical Current Density ◽  
Critical Current ◽  
Current Density ◽  
Electromagnetic Properties ◽  
Length Scale ◽  
Density Values ◽  
Current Densities ◽  
Applied Fields ◽  
A Current

A current theme in the study of the critical current density behavior of YBa2Cu3O7-δ (YBCO) grain boundaries is that their electromagnetic properties are heterogeneous on various length scales ranging from 10s of microns to ˜ 1 Å. Recently, combined electromagnetic and TEM studies on four flux-grown bicrystals have demonstrated a direct correlation between the length scale of the boundaries’ saw-tooth facet configurations and the apparent length scale of the electrical heterogeneity. In that work, enhanced critical current densities are observed at applied fields where the facet period is commensurate with the spacing of the Abrikosov flux vortices which must be pinned if higher critical current density values are recorded. To understand the microstructural origin of the flux pinning, the grain boundary topography and grain boundary dislocation (GBD) network structure of [001] tilt YBCO bicrystals were studied by TEM and HRTEM.

Electromagnetic properties of sintered YBaCuO superconductors: critical current densities, transport currents and a.c. losses

Cryogenics ◽  
1989 ◽  
Vol 29 (3) ◽  
pp. 341-346 ◽  
Author(s):  
J.R. Cave ◽  
M. Mautref ◽  
C. Agnoux ◽  
A. Leriche ◽  
A. Février
Keyword(s):  
Critical Current ◽  
Electromagnetic Properties ◽  
Current Densities

Analysis of Electromagnetic Properties of Bulk Superconductors

2021 ◽  
Vol 21 (9) ◽  
pp. 4941-4943
Author(s):  
Sang Heon Lee
Keyword(s):  
Critical Current Density ◽  
Single Crystal ◽  
Critical Current ◽  
Current Density ◽  
Magnetic Force ◽  
Electromagnetic Properties ◽  
Weak Links ◽  
Metallic Silver ◽  
Bulk Superconductor ◽  
Slow Cooling

In the present study, a YBa2Cu3O7−y bulk superconductor added with 5~10 wt% Ag was fabricated employing Sm123 as a seed to produce a superconductive single crystal. Metallic silver was added to the single crystal of YBa2Cu3O7−y to remove defects such as cracks and pores. Electromagnetic properties of the bulk superconductor at 77 K were analyzed based on relationships of magnetic levitation, trapped magnetic force, and critical current density. The critical current density of the superconductor at 77 K and 0 T was 3.53 × 104 A/cm2. Discontinuous points in the distribution of magnetic field lines were not observed, implying that these two specimens grew well as a single crystal without specific weak links. For the growth of a superconductive nano crystal employing slow cooling at temperature of formation of 123 phase, superconductive nano crystals were aligned in a-b direction, the direction of peak current flow. The peak value of the trapped magnetic force of the YBa2Cu3O7−y superconductor specimen was 3.23 kG. Using the FC method, peak forces of attraction and repulsion were 21.696 N and 70.168 N, respectively.

Fractional magnetic flux transition in two-band single-junction superconducting rings

2019 ◽  
Vol 33 (05) ◽  
pp. 1950054
Author(s):  
Hai Huang ◽  
Jian-Jiang Zhang ◽  
Xia Huang
Keyword(s):  
Magnetic Flux ◽  
Phase Difference ◽  
Soliton Solution ◽  
Electromagnetic Properties ◽  
Current Phase ◽  
Ginzburg Landau ◽  
Single Junction ◽  
Superconducting Ring ◽  
Circulating Current ◽  
Junction Structure

Based on Ginzburg–Landau (GL) theory, we study the electromagnetic properties of two-band superconducting ring with a microbridge structure. The phase difference of two-order parameters in two-band superconductors satisfies the sine-Gordon equation, and from its soliton solution, the linear relation between the phase difference at both ends of the junction and total magnetic flux in the ring can be obtained. Then with the Josephson current-phase relation in the two-band superconducting microbridge, we establish the dependence of the circulating current and total magnetic flux on the applied external magnetic field. Our analysis shows that the soliton solution and the fractional flux quantization in two-band superconductors can be verified by measuring the properties of this single-junction structure.

Enhanced critical current density in multifilamentary NbTi/Cu superconductors with highly aligned artificial pinning center

2004 ◽  
Vol 412-414 ◽  
pp. 1244-1250
Author(s):  
X.H. Liu ◽  
A. Sulpice ◽  
E. Mossang ◽  
R. Tournier ◽  
T. Fournier ◽  
...  
Keyword(s):  
Critical Current Density ◽  
Critical Current ◽  
Current Density ◽  
Pinning Center
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