Critical current densities and irreversibility fields of new high-Tc Ba2CaCu2O4(O,F)2 superconductor

2008 ◽  
Vol 468 (7-10) ◽  
pp. 773-776 ◽  
Author(s):  
P.M. Shirage ◽  
D.D. Shivagan ◽  
A. Crisan ◽  
Y. Tanaka ◽  
Y. Kodama ◽  
...  
Keyword(s):  
Critical Current ◽  
High Tc ◽  
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.

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

Preparation of Y-BA-CU Oxide Superconducting Composite Tapes by a Diffusion Process

1987 ◽  
Vol 99 ◽  
Author(s):  
K. Tachikawa ◽  
M. Sugimoto ◽  
N. Sadakata ◽  
O. Kohno
Keyword(s):  
Diffusion Process ◽  
Critical Current ◽  
Liquid Nitrogen ◽  
Liquid Nitrogen Temperature ◽  
Oxide Compound ◽  
High Tc ◽  
Powder Metallurgical Process ◽  
Current Densities ◽  
Wire Fabrication ◽  
Made In

Since discovery of the Y-Ba-Cu oxide compound showing superconductivity above liquid nitrogen temperature, intensive study has been under way to clarify nature of the high Tc oxides[l-4]. Much efforts were also made in the field of superconductor applications. A number of studies have been carried out by a powder metallurgical process of Y-Ba-Cu oxide compound wires, although, obtained critical current densities were still low at liquid nitrogen temperature[5–6]. Other techniques for wire fabrication is also being attempted[7–9]. In this study, Y-Ba-Cu oxide superconducting composite tapes were prepared by a diffusion process, which is one of the promising methods to obtain a high critical current density.

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

scholarly journals CRITICAL CURRENT IN THE HIGH-Tc GLASS MODEL

1999 ◽  
Vol 10 (07) ◽  
pp. 1335-1345
Author(s):  
I. MORGENSTERN ◽  
W. FETTES ◽  
T. HUSSLEIN
Keyword(s):  
Hubbard Model ◽  
Critical Current ◽  
Critical Currents ◽  
Microscopic Description ◽  
High Tc ◽  
Wave Pairing ◽  
Glass Model ◽  
Current Densities ◽  
D Wave

The high-Tc glass model can be combined with the repulsive tt'–Hubbard model as microscopic description of the striped domains found in the high-Tc materials. In this picture, the finite Hubbard clusters are the origin of the d-wave pairing. In this paper we show that the glass model can also explain the critical currents usually observed in the high-Tc materials. We use two different approaches to calculate the critical current densities of the high-Tc glass model. Both lead to a strongly anisotropic critical current. Finally we give an explanation of why we nonetheless expect a nearly perfect isotropic critical current in high-Tc superconductors.

Effects of Ag-doping on critical current densities in high Tc superconducting materials of YBa2Cu3O7−x

1989 ◽  
Vol 24 (11) ◽  
pp. 1369-1373 ◽  
Author(s):  
Beiling Shao ◽  
Ansheng Liu ◽  
Yiyu Zhou ◽  
Jianguo Zhang ◽  
Junsheng Wang
Keyword(s):  
Critical Current ◽  
Superconducting Materials ◽  
High Tc ◽  
Ag Doping ◽  
Current Densities

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
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