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.

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

Fabrication and Superconducting Properties of High Tc Oxide Wire

1987 ◽  
Vol 99 ◽  
Author(s):  
N. Sadakata ◽  
Y. Ikeno ◽  
M. Nakagawa ◽  
K. Gotoh ◽  
O. Kohno
Keyword(s):  
Critical Current Density ◽  
Liquid Nitrogen ◽  
Liquid Nitrogen Temperature ◽  
Intrinsic Properties ◽  
Superconducting Properties ◽  
Intensive Study ◽  
High Tc ◽  
Fabrication Procedure ◽  
Paper Fabrication ◽  
Critical Current Density Jc

Since the discovery of high Tc superconducting oxide such as Ln-Ba-Cu-O system which shows superconductivity above liquid nitrogen temperature, intensive study has been carried out to investigate its intrinsic properties[l-4]. Superconducting wire which operates in liquid nitrogen is one of the emerging products among application, however, there are many factors to be investigated for practical use. Critical current density, Jc, is one of the most important characteristics of superconductor, although, only few report describing Jc measurement ever published[5]. In this paper, fabrication procedure of silver sheathed Y-Ba-Cu-O wire by powder metallurgical technique and its superconducting properties have been reported. Other factors which may influence superconductivity such as microstructure of the oxide, configuration of wires, etc. are also discussed.

On The Formation of Si Oxide by Ion Implantation

1985 ◽  
Vol 45 ◽  
Author(s):  
F. Namavar ◽  
J.I. Budnick ◽  
F.H. Sanchez ◽  
H.C. Hayden
Keyword(s):  
Ion Implantation ◽  
Liquid Nitrogen ◽  
Room Temperature ◽  
Experimental Situation ◽  
Liquid Nitrogen Temperature ◽  
Excess Oxygen ◽  
Implantation Temperature ◽  
Current Densities

ABSTRACTOxygen 0+ ions have been implanted into Si both at room temperature and liquid nitrogen temperature in order to determine the effect of implantation temperature on SiO2 formation. Samples were analysed by RBS with 1.5 MeV He+ ions. The implants of 0+ in Si were done at 150 keV with current densities of ≤10 μA/cm2. For doses of more than 1.5×1018 0+/cm2, in-situ RBS experiments positively indicate a 2:1 oxygen silicon ratio. Increased 0+ doses (for both room temperature and liquid nitrogen temperature) cause the Si02 layers to spread uniformly and symmetrically toward both the surface and the interior. From these results, it is apparent that excess oxygen diffuses toward Si/Si02 interfaces in our experimental situation even at liquid nitrogen temperature.

Factors Controlling Transport Properties of Interfaces in High-Tc Superconductors

1999 ◽  
Vol 574 ◽  
Author(s):  
H. Hilgenkamp ◽  
R. R. Schulz ◽  
C. W. Schneider ◽  
B. Goetz ◽  
A. Schmehl ◽  
...  
Keyword(s):  
Grain Boundaries ◽  
Transport Properties ◽  
Critical Current ◽  
Electronic Band Structure ◽  
Metal Contacts ◽  
Boundary Misorientation ◽  
Electronic Band ◽  
High Tc ◽  
Electrical Fields ◽  
Current Densities

AbstractA comprehensive understanding of the transport properties of interfaces in high-Tc cuprates been obtained by considering their microstructure, the possibility of bending of the electronic band structure in these materials, and the predominant dx2-y2 -symmetry of the order parameter in most high-Tc cuprates. These factors are of central importance for the critical current density and the normal state resistivity of grain boundaries and their dependencies on boundary misorientation and on applied magnetic and electrical fields. In addition, some of these factors play an important role for the transport properties of other interfaces involving high-Tc superconductors, such as superconductors-normal metal contacts.Based on the improved understanding of the mechanisms controlling interface transport properties, we have been able to meet a long-standing challenge in high-Tc superconductivity and have increased the critical current densities of grain boundaries by large factors, using appropriate doping.

Sign in / Sign up

Export Citation Format

Share Document