scholarly journals Critical Current Problems in HTc Superconductors

2010 ◽  
Vol 118 (2) ◽  
pp. 328-330
Author(s):  
J. Sosnowski
Keyword(s):  
Critical Current ◽  
Htc Superconductors

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.

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.

scholarly journals Critical Current Test of Liquid Hydrogen Cooled HTC Superconductors under External Magnetic Field

2016 ◽  
Vol 81 ◽  
pp. 158-161 ◽  
Author(s):  
Yasuyuki Shirai ◽  
Masahiro Shiotsu ◽  
Hideki Tatsumoto ◽  
Hiroaki Kobayashi ◽  
Yoshihiro Naruo ◽  
...  
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Critical Current ◽  
Liquid Hydrogen ◽  
Current Test ◽  
Htc Superconductors

Microstructural characterization of YBa2Cu3O7-x thin films formed by metalorganic CVD

1991 ◽  
Vol 49 ◽  
pp. 1080-1081
Author(s):  
P. Lu ◽  
W. Huang ◽  
C.S. Chern ◽  
Y.Q. Li ◽  
J. Zhao ◽  
...  
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Critical Current Density ◽  
Critical Current ◽  
Current Density ◽  
Film Growth ◽  
Chemical Vapor ◽  
Microstructural Characterization ◽  
Ion Milling ◽  
Conventional Grinding

The YBa2Cu3O7-x thin films formed by metalorganic chemical vapor deposition(MOCVD) have been reported to have excellent superconducting properties including a sharp zero resistance transition temperature (Tc) of 89 K and a high critical current density of 2.3x106 A/cm2 or higher. The origin of the high critical current in the thin film compared to bulk materials is attributed to its structural properties such as orientation, grain boundaries and defects on the scale of the coherent length. In this report, we present microstructural aspects of the thin films deposited on the (100) LaAlO3 substrate, which process the highest critical current density.Details of the thin film growth process have been reported elsewhere. The thin films were examined in both planar and cross-section view by electron microscopy. TEM sample preparation was carried out using conventional grinding, dimpling and ion milling techniques. Special care was taken to avoid exposure of the thin films to water during the preparation processes.

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.

Development of a thick GdBCO and ZrO2-doped GdBCO film with a high critical current on a PLD-CeO2/IBAD-GZO metal substrate

2007 ◽  
Vol 463-465 ◽  
pp. 630-632 ◽  
Author(s):  
A. Kinoshita ◽  
K. Takahashi ◽  
H. Kobayashi ◽  
Y. Yamada ◽  
A. Ibi ◽  
...  
Keyword(s):  
Critical Current ◽  
Metal Substrate
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