Imperfection of flux pinning classification based on the pinning center size

2004 ◽  
Vol 411 (1-2) ◽  
pp. 77-82 ◽  
Author(s):  
Rongchao Ma ◽  
Yuefei Ma ◽  
Wenhai Song ◽  
Xuebin Zhu ◽  
Shengman Liu ◽  
...  
Keyword(s):  
Flux Pinning ◽  
Pinning Center

Flux pinning behavior in Nb50Ti/Cu superconducting composite with different form of artificial pinning center

2003 ◽  
Vol 386 ◽  
pp. 403-406 ◽  
Author(s):  
X.H. Liu ◽  
L. Zhou ◽  
X.Z. Wu ◽  
B.Q. Fu ◽  
F.Y. Wang ◽  
...  
Keyword(s):  
Flux Pinning ◽  
Pinning Center

Flux Pinning and Weak Link Structure in Ca2Cu1O3 Doped LnBa2Cu3O7-y (Ln=La and Y)

1989 ◽  
Vol 169 ◽  
Author(s):  
F. Mizuno ◽  
H. Masuda ◽  
I. Hirabayashi ◽  
S. Tanaka
Keyword(s):  
Magnetic Field ◽  
Flux Pinning ◽  
Magnetic Field Dependence ◽  
Weak Link ◽  
Impurity Phase ◽  
Experimental Result ◽  
Ca Doping ◽  
Link Structure ◽  
Pinning Center ◽  
The Magnetic Field

AbstractFlux pinning and weak link structure were studied on the effect of Ca doping in LnBa2Cu3O7-y system (Ln=La and Y). The magnitude and the magnetic field dependence of the critical current density were improved by Ca doping. A small amount of impurity phase of such as Ca2Cu1O3 may work as a desirable flux pinning center. Moreover, it was found that the current-temperature characteristics for Ca-doped samples showed the evidence of two kinds of superconducting phases which have different transition temperature Tc and Tc'. The experimental result agrees well with the Ambegaokar-Baratoff theory for asymmetric Josephson junctions (S-I-S') in the temperature range of T < Tc' and with the proximity junction theory (S-N-S) in the range of Tc'<T<Tc.

scholarly journals Improvement of MTG Process for Preparation and its property of YBCO Superconductor

2016 ◽  
Vol 1 (1) ◽  
pp. 39
Author(s):  
Dea-wha Soh
Keyword(s):  
Heat Treatment ◽  
Critical Current Density ◽  
Critical Current ◽  
Current Density ◽  
Flux Pinning ◽  
Seed Crystal ◽  
Oxygen Absorption ◽  
Ybco Superconductor ◽  
Pinning Center ◽  
Effect Of Oxygen

<p>To improve the superconductivity of high temperature YBCO superconductor, it was prepared and examined by MTG (melt-textured growth) process with use of SmBaCuO seed crystal for orientation, additives of Ag and 211 phase for current density and flux pinning, and heat treatment for oxygen absorption. SmBaCuO single crystals were prepared by MTG process with oxygen absorption and analyzed by XRD and Laue technique. It was estimated that optimum value of Y<sub>2</sub>BaCuO<sub>5</sub> (211 phase) contents in the textured YBCO superconductor as flux pinning center was about 20 wt.%. Ag contents have no influence on the critical temperature but have large influence on the critical current density of the textured YBCO. In the YBCO matrix in experiment, 10 wt.% of Y<sub>2</sub>BaCuO<sub>5</sub> was added, the final 211 content of YBCO made by MTG process could reach about 20 wt.% which was the optimum value for the critical current density. The Ag contents in textured YBCO and the effects of Ag on the superconductivity were also examined. A 5x5x2 mm<sup>3</sup> single crystal of SmBaCuO grown by the melted-condensed process was used to be the seed crystal in the preparation of YBCO. It was proved that the orientation of YBCO was the same as the orientation of the SmBaCuO seed. The effect of oxygen absorption of the bulk oriented YBCO was studied and the heat treatment of oxygen absorption would be in flowing oxygen, at 400 for about 24 hours. The critical current density of the textured YBCO prepared by the optimum technical conditions was about 7x10<sup>4</sup> A/cm<sup>2</sup> (77K, 0.01T).</p>

scholarly journals Introduction of Flux Pinning Center in Sintered Bi-2223 Superconductors by 290MeV/n 40Ar Irradiation.

1999 ◽  
Vol 46 (9) ◽  
pp. 994-998
Author(s):  
Takeyuki Kikuchi ◽  
Makoto Nakanishi ◽  
Masahiro Nagae ◽  
Yoshihiro Kusano ◽  
Tatsuo Fujii ◽  
...  
Keyword(s):  
Flux Pinning ◽  
Pinning Center

Approaches in controllable generation of artificial pinning center in REBa2Cu3Oy-coated conductor for high-flux pinning

2017 ◽  
Vol 30 (10) ◽  
pp. 104002 ◽  
Author(s):  
Y Yoshida ◽  
S Miura ◽  
Y Tsuchiya ◽  
Y Ichino ◽  
S Awaji ◽  
...  
Keyword(s):  
Flux Pinning ◽  
Coated Conductor ◽  
High Flux ◽  
Pinning Center

Flux pinning property of artificial pinning center introduced by microfabrication

2003 ◽  
Vol 392-396 ◽  
pp. 1043-1047 ◽  
Author(s):  
N. Harada ◽  
H. Yamada ◽  
K. Sugai ◽  
I. Munechika ◽  
M. Tsuda ◽  
...  
Keyword(s):  
Flux Pinning ◽  
Pinning Center

Interfacial studies in Nb3Sn superconductors

1991 ◽  
Vol 49 ◽  
pp. 590-591
Author(s):  
Ernest L. Hall ◽  
Lee E. Rumaner ◽  
Mark G. Benz
Keyword(s):  
Grain Size ◽  
Grain Boundaries ◽  
Flux Pinning ◽  
Size Control ◽  
High Magnetic Fields ◽  
Type Ii ◽  
Reaction Interface ◽  
Liquid Diffusion ◽  
Type Ii Superconductor ◽  
Grain Size Control

The intermetallic compound Nb3Sn is a type-II superconductor of interest because it has high values of critical current density Jc in high magnetic fields. One method of forming this compound involves diffusion of Sn into Nb foil containing small amounts of Zr and O. In order to maintain high values of Jc, it is important to keep the grain size in the Nb3Sn as small as possible, since the grain boundaries act as flux-pinning sites. It has been known for many years that Zr and O were essential to grain size control in this process. In previous work, we have shown that (a) the Sn is transported to the Nb3Sn/Nb interface by liquid diffusion along grain boundaries; (b) the Zr and O form small ZrO2 particles in the Nb3Sn grains; and (c) many very small Nb3Sn grains nucleate from a single Nb grain at the reaction interface. In this paper we report the results of detailed studies of the Nb3Sn/Nb3Sn, Nb3Sn/Nb, and Nb3Sn/ZrO2 interfaces.

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