Superconducting–magnetic heterostructures: a method of decreasing AC losses and improving critical current density in multifilamentary conductors

2009 ◽  
Vol 21 (25) ◽  
pp. 254206 ◽  
Author(s):  
B A Glowacki ◽  
M Majoros
Keyword(s):  
Critical Current Density ◽  
Critical Current ◽  
Current Density ◽  
Ac Losses ◽  
Magnetic Heterostructures

scholarly journals Influence of the carbon substitution on the critical current density and AC losses in MgB2 single crystals

2010 ◽  
Vol 78 (3) ◽  
pp. 359-365 ◽  
Author(s):  
M. Ciszek ◽  
K. Rogacki ◽  
K. Oganisian ◽  
N. D. Zhigadlo ◽  
J. Karpinski
Keyword(s):  
Critical Current Density ◽  
Single Crystals ◽  
Critical Current ◽  
Current Density ◽  
Ac Losses ◽  
Carbon Substitution

scholarly journals AC losses and critical current density of superconducting GdBa2Cu3O7−x

1988 ◽  
Vol 152 (3) ◽  
pp. 247-250 ◽  
Author(s):  
M. Ciszek ◽  
J. Olejniczak ◽  
E. Trojnar ◽  
A.J. Zaleski ◽  
J. Klamut ◽  
...  
Keyword(s):  
Critical Current Density ◽  
Critical Current ◽  
Current Density ◽  
Ac Losses

Critical current density, magnetization and AC losses in the YBa2Cu3O6.5+x superconductor

1988 ◽  
Vol 156 (1) ◽  
pp. 79-89 ◽  
Author(s):  
M. Polák ◽  
F. Hanic ◽  
I. Hlásnik ◽  
M. Majoroš ◽  
F. Chovanec ◽  
...  
Keyword(s):  
Critical Current Density ◽  
Critical Current ◽  
Current Density ◽  
Ac Losses

The Effect of Oxygen Distribution Inhomogeneity and Presence of Higher Borides on the Critical Current Density Improvement of Nanostructural MgB2

2010 ◽  
Vol 75 ◽  
pp. 161-166 ◽  
Author(s):  
Tetiana Prikhna ◽  
Wolfgang Gawalek ◽  
Yaroslav Savchuk ◽  
Maxim Serga ◽  
Tobias Habisreuther ◽  
...  
Keyword(s):  
High Pressure ◽  
Critical Current Density ◽  
Critical Current ◽  
Current Density ◽  
Upper Critical Field ◽  
The Self ◽  
Ex Situ ◽  
Ac Losses ◽  
Material Structure ◽  
Effect Of Oxygen

MgB2-based nanostructural materials with rather high oxygen concentration (5-14 wt.%) and dispersed grains of higher borides (MgB12, MgB7) high-pressure (2 GPa or 30 MPa) synthesized (in-situ) or sintered (ex-situ) demonstrated high superconducting characteristics (critical current density, jc, up to 1.8-1.0106 A/cm2 in the self magnetic field and 103 in 8 T field at 20 K, 3-1.5105 A/cm2 in the self field at 35 K, upper critical field up to HC2 = 15 T at 22 K, field of irreversibility Hirr =13 T at 20 K). The additives (Ti, SiC) and synthesis or sintering temperature can affect the segregation of oxygen and formation of oxygen-enriched Mg-B-O inclusions in the material structure, thus reducing the amount of oxygen in the material matrix as well as the formation of higher borides grains, which affects an increase of the critical current density. The record high HC2 and Hirr have been registered for the material high-pressure (2 GPa) synthesized from Mg and B at 600 oC having 17% porosity and more than 7 wt.% of oxygen. The attained values of the critical current, AC losses and thermal conductivity make the materials promising for application for fault current limiters and electromotors. The structural and superconducting (SC) characteristics of the material with matrix close to MgB12 in stoichiometry has been studied and the SC transition Tc=37 K as well as jc= 5×104 A/cm2 at 20 K in the self field were registered, its Raman spectrum demonstrated metal-like behavior.

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