Method for improving performance of high temperature superconductors within a magnetic field
a superconductors and magnetic field technology, applied in the direction of superconducting magnets/coils, magnetic bodies, instruments, etc., can solve the problems of increasing the barrier to their commercialization, affecting the cost/performance ratio of hts products, and rapid reduction of the ability, etc., to achieve the effect of improving the performance of the magnetic field
Inactive Publication Date: 2010-01-28
LOS ALAMOS NATIONAL SECURITY
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Benefits of technology
[0009]The present invention further provides a process of improving performance within magnetic fields of a high temperature superconductor by forming a buffer layer upon a base substrate including a layer of an oriented cubic oxide material having a rock-salt-like structure layer thereon, said buffer layer having an outwardly facing surface with a surface morphology including particulate outgrowths of from 10 nm to 500 nm in size at said surface, said particulate outgrowths having a surface density characterized as sufficiently high so as to yield a higher Jc in any adjacent high temperature superconductive oxide material under in-field conditions in comparison to a similar high temperature superconductive oxide material in the absence of such a surface density of said particulate outgrowths, said surface density further characterized as insufficient in magnitude so as to yield a significant reduction in Jc at self-field; and, forming a layer of a high temperature superconductive oxide material upon said buffer layer.
Problems solved by technology
Although YBCO is capable of supporting very high current densities without resistance, this capability rapidly diminishes in the presence of a magnetic field.
Ultimately, this phenomenon adversely impacts the cost / performance ratio of HTS products thereby raising the barrier to their commercialization.
This negates the benefit of superconductivity and needs to be overcome.
1338-1349 (2000)) wherein surface particles were added in a separate deposition step thereby adding to the production cost.
Method used
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[0031]A series of coated conductors were formed with the following structure: a Hastelloy base substrate / a layer of aluminum oxide (Al2O3) / a layer of yttrium oxide (Y2O3) / a layer of IBAD-MgO / a homoepitaxial layer of MgO / a layer of strontium titanate (STO) / a layer of YBCO (1 to 5 microns). The layer of STO was deposited by pulsed laser deposition using conditions for such deposition as described by Wang et al., J. Mater. Res., v. 19, no. 6, pp. 1869-1875 (2004), such reference incorporated herein by reference. Deposition temperature was varied from 670° C. to 860° C. at constant oxygen pressure of 300 milliTorr. From this structure, the measured properties of the YBCO layer was: a superconducting transition temperature (Tc) of 89 K, and a critical current density (Jc) of 1.0 MA / cm2 with YBCO thickness at 4.0 μm.
[0032]FIG. 2 shows the SEM for depositions at varying temperatures. It was found that the number of particulate outgrowths were greater at the lower temperatures. It was found...
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Abstract
The present invention provides articles including a base substrate including a layer of an oriented cubic oxide material having a rock-salt-like structure layer thereon; and, a buffer layer upon the oriented cubic oxide material having a rock-salt-like structure layer, the buffer layer having an outwardly facing surface with a surface morphology including particulate outgrowths of from 10 nm to 500 run in size at the surface, such particulate outgrowths serving as flux pinning centers whereby the article maintains higher performance within magnetic fields than similar articles without the necessary density of such outgrowths.
Description
STATEMENT REGARDING FEDERAL RIGHTS[0001]This invention was made with government support under Contract No. W-7405-ENG-36 awarded by the U.S. Department of Energy. The government has certain rights in the invention.FIELD OF THE INVENTION[0002]The present invention relates to high temperature superconducting thick films and more particularly to improvement of their performance within magnetic fields.BACKGROUND OF THE INVENTION[0003]High temperature superconducting (HTS) materials such as YBa2Cu3O7-δ (YBCO) are rapidly approaching the manufacturing stage in the form of flexible tapes known as coated conductors. This material will be used in a range of electric power applications such as magnets, motors, generators, and transformers. Although YBCO is capable of supporting very high current densities without resistance, this capability rapidly diminishes in the presence of a magnetic field. As most of the potential applications involve magnetic fields, supercurrent levels would be dimini...
Claims
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IPC IPC(8): H01L39/12H01L39/24
CPCH01L39/2461Y10T428/26Y10T29/49014H01L39/2483H10N60/0632H10N60/0828
Inventor WANG, HAIYANFOLTYN, STEPHEN R.MAIOROV, BORIS A.CIVALE, LEONARDO
Owner LOS ALAMOS NATIONAL SECURITY
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