scholarly journals Magnetoresistance and Irreversibility Fields of Bismuth-Based 1G Tape

2016 ◽  
Vol 29 (9) ◽  
pp. 2333-2336 ◽  
Author(s):  
W. M. Woch ◽  
M. Chrobak ◽  
M. Kowalik ◽  
R. Zalecki ◽  
J. Przewoźnik ◽  
...  
Keyword(s):  
Irreversibility Fields

Structure and Functional Properties of Bulk MgB2 Superconductors Synthesized and Sintered under Pressure

2014 ◽  
Vol 792 ◽  
pp. 21-26 ◽  
Author(s):  
Tatiana Prikhna ◽  
Michael Eisterer ◽  
Wolfgang Gawalek ◽  
Athanasios G. Mamalis ◽  
Artem Kozyrev ◽  
...  
Keyword(s):  
Critical Current ◽  
Material Structure ◽  
Bulk Materials ◽  
Critical Fields ◽  
Current Densities ◽  
Upper Critical Fields ◽  
Irreversibility Fields ◽  
Grain Boundary Pinning ◽  
Effect Of Oxygen ◽  
Oxygen Impurities

The high pressure (50 MPa - 2 GPa) – high temperature synthesized MgB2 bulk materials are characterized by nearly theoretical density (1-2% porosity), 80-98% connectivity, extremely high critical current densities (e.g. at 20 K, in 0–1 T jc=1.3–1.0 MA·cm-2 (with 10% SiC) and jc= 0.92 – 0.73 MA·cm-2 (without doping)), large irreversibility fields (Birr(18.4 K) =15 T and Birr (0 K) = 32.5 T) and high upper critical fields (Bc2 (22 K) =15 T and Bc2(0 K) ~ 42.1 T). The transformation of grain boundary pinning to point pinning in MgB2-based materials with increasing manufacturing temperature (from 800 to 1050 oC) under pressures from 0.1 to 2 GPa correlates well with an increase in critical current density in low external magnetic fields caused by the redistribution of boron and the oxygen impurities in the material structure. As the manufacturing temperature increases, the discontinuous oxygen enriched layers transform into distinct Mg-B-O inclusions and the size and amount of inclusions of higher magnesium borides MgBX (X>4) are reduced. The effect of oxygen and boron redistribution can be enhanced by Ti or SiC additions.

Critical Current Densities and Irreversibility Fields of HighTcSuperconductors,GaSr2Ca2Cu3O9andBSr2Can-1CunO2n+3(n=3, 4)

1996 ◽  
Vol 35 (Part 1, No. 6A) ◽  
pp. 3378-3382 ◽  
Author(s):  
Shan Yu ◽  
Yuichi Okuda ◽  
Tetsuya Kawashima ◽  
Eiji Takayama-Muromachi
Keyword(s):  
Critical Current ◽  
Current Densities ◽  
Irreversibility Fields

Critical Current Densities and Irreversibility Fields of High Temperature SuperconductorsSr2Ca2Cu3O7+δandSr2Can-1CunO2n+δF2+y(n=2, 3)

1996 ◽  
Vol 35 (Part 1, No. 8) ◽  
pp. 4293-4296 ◽  
Author(s):  
Shan Yu ◽  
Yuichi Okuda ◽  
Tetsuya Kawashima ◽  
Eiji Takayama-Muromachi
Keyword(s):  
High Temperature ◽  
Critical Current ◽  
Current Densities ◽  
Irreversibility Fields

Upper critical and irreversibility fields in selectively doped YBa2Cu3O7

1995 ◽  
Vol 8 (5) ◽  
pp. 619-620
Author(s):  
Franz Freibert ◽  
Gang Cao ◽  
Jack Crow ◽  
Michelle Shepard ◽  
Scott McCall
Keyword(s):  
Irreversibility Fields

Critical Current Densities and Irreversibility Fields in Pb-Doped and Pb-Free Bi2Sr2Ca2Cu3OySuperconductors

1996 ◽  
Vol 35 (Part 1, No. 5A) ◽  
pp. 2619-2623 ◽  
Author(s):  
Shan Yu ◽  
Yuichi Okuda ◽  
Eiji Takayama-Muromachi
Keyword(s):  
Critical Current ◽  
Current Densities ◽  
Irreversibility Fields

scholarly journals Critical currents, pinning forces and irreversibility fields in (YxTm1−x)Ba2Cu3O7 single crystals with columnar defects in fields up to 50 T

1999 ◽  
Vol 313 (1-2) ◽  
pp. 1-10 ◽  
Author(s):  
L. Trappeniers ◽  
J. Vanacken ◽  
L. Weckhuysen ◽  
K. Rosseel ◽  
A.Yu. Didyk ◽  
...  
Keyword(s):  
Single Crystals ◽  
Critical Currents ◽  
Columnar Defects ◽  
Irreversibility Fields

scholarly journals Irreversibility fields of Bi-2223 at 30-77 K

2003 ◽  
Vol 13 (2) ◽  
pp. 2945-2948 ◽  
Author(s):  
J.G. Chandler ◽  
J. Jiang ◽  
X.Y. Cai ◽  
L.A. Schwartzkopf ◽  
D.C. Larbalestier
Keyword(s):  
Irreversibility Fields
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