scholarly journals Critical current densities and irreversibility fields of high-Tcsuperconductors AuBa2Can−1CunO2n+3(n= 3,4) prepared under high pressure

2003 ◽  
Vol 4 (4) ◽  
pp. 277-280 ◽  
Author(s):  
S. Yu ◽  
E.M. Kopnin ◽  
E. Takayama-Muromachi
Keyword(s):  
High Pressure ◽  
Critical Current ◽  
Current Densities ◽  
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.

Enhancement of critical current densities by high-pressure sintering in (Sr,K)Fe2As2PIT wires

2014 ◽  
Vol 27 (9) ◽  
pp. 095002 ◽  
Author(s):  
Sunseng Pyon ◽  
Yuji Tsuchiya ◽  
Hiroshi Inoue ◽  
Hideki Kajitani ◽  
Norikiyo Koizumi ◽  
...  
Keyword(s):  
High Pressure ◽  
Critical Current ◽  
High Pressure Sintering ◽  
Current Densities

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

scholarly journals Critical current densities of high pressure oxygen sputtered thin films of YBa2Cu3O7−x by non-resonant rf absorption method

Pramana ◽  
1993 ◽  
Vol 40 (2) ◽  
pp. 119-122 ◽  
Author(s):  
V V Srinivasu ◽  
S V Bhat ◽  
G K Muralidhar ◽  
G Mohan Rao ◽  
S Mohan
Keyword(s):  
Thin Films ◽  
High Pressure ◽  
Critical Current ◽  
Absorption Method ◽  
Pressure Oxygen ◽  
High Pressure Oxygen ◽  
Current Densities

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

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

Critical Current Densities and Irreversibility Fields of (B,C)(Sr,Ba)2Ca2Cu3O9 and Ba2Ca2Cu3 O6(O2-yFy)

1998 ◽  
pp. 533-536
Author(s):  
Akira Iyo ◽  
Kazuyasu Tokiwa ◽  
Yasumoto Tanaka ◽  
Norio Terada ◽  
Masayuki Hirabayashi ◽  
...  
Keyword(s):  
Critical Current ◽  
Current Densities ◽  
Irreversibility Fields

High Critical Current Density of a MgB2 Bulk Superconductor High-pressure Synthesized Directly from the Elements

2002 ◽  
Vol 17 (3) ◽  
pp. 525-527 ◽  
Author(s):  
C-Q. Jin ◽  
S-C. Li ◽  
J-L. Zhu ◽  
F-Y. Li ◽  
Z-X. Liu ◽  
...  
Keyword(s):  
High Pressure ◽  
Critical Current Density ◽  
Critical Current ◽  
Current Density ◽  
Superconducting Transition ◽  
High Critical Current Density ◽  
Bulk Superconductor ◽  
High Pressure Sintering ◽  
Current Densities ◽  
Pressure Synthesis

We report the property studies of a MgB2 superconductor with high critical current density. The MgB2 superconductor was readily fabricated through a direct high-pressure synthesis of the respective elements. The obtained high-density MgB2 undergoes a sharp superconducting transition at 39 K. The bulk critical current density (Jc) of the sample was calculated on the basis of Bean's critical state model, and rather high critical current densities over a wide temperature range were obtained in comparison with the ambient prepared samples. The results highlight that high-pressure sintering would be a promising way to produce and search for this kind of intermetallic boride and the related superconductors.

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