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Structure for improved high critical current densities in YBCO coatings

A high-temperature, oriented layer technology, applied in circuits, electrical components, superconducting devices, etc., can solve problems such as the reduction of critical current density

Inactive Publication Date: 2008-08-06
LOS ALAMOS NATIONAL SECURITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the other hand, the critical current density tends to decrease with the increase of YBCO film thickness

Method used

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  • Structure for improved high critical current densities in YBCO coatings
  • Structure for improved high critical current densities in YBCO coatings
  • Structure for improved high critical current densities in YBCO coatings

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Example 1 (HW219)

[0033] will consist of 4 layers of YBCO and 3 layers of cerium oxide (CeO 2 ) multilayer (YBCO / CeO 2 / YBCO / CeO 2 / YBCO / CeO 2 / YBCO) deposited on a nickel metal substrate consisting of an aluminum oxide layer (Al 2 o 3 ), a layer of yttrium oxide (Y 2 o 3 ), at Y 2 o 3 A layer of magnesium oxide (MgO) is deposited on the surface by ion beam assisted deposition (IBAD), and magnesium oxide is grown homoepitaxially on the ion beam deposited magnesium oxide. Under traditional processing conditions, such as a substrate temperature of about 700 ° C, pulsed laser Deposition method A layer of strontium titanate was deposited as a buffer layer of MgO (see, Jia et al., Physica C, v.228, pp.160-164, 1994). Each YBCO layer is about 0.75 μm in a total thickness of YBCO of about 3.0 μm. per CeO 2 layer about 30nm. Measured J c About 2.5MA / cm 2 .

Embodiment 2

[0034] Example 2 (HW162)

[0035] will consist of 4 layers of YBCO and 3 layers of cerium oxide (CeO 2 ) multilayer (YBCO / CeO 2 / YBCO / CeO 2 / YBCO / CeO 2 / YBCO) deposited on a nickel metal substrate consisting of an aluminum oxide layer (Al 2 o 3 ), a layer of yttrium oxide (Y 2 o 3 ), at Y 2 o 3 A layer of magnesium oxide (MgO) was deposited by ion beam deposition (IBAD), and homoepitaxial magnesium oxide was deposited on ion beam deposited magnesium oxide. Under traditional processing conditions, a layer of strontium titanate was deposited by pulsed laser deposition as MgO buffer layer. YBCO / Y with a total thickness of about 2.5 μm 2 o 3 Each YBCO layer in is about 0.60 μm. per CeO 2 layer about 30nm. Measured J c About 3.2MA / cm 2 .

Embodiment 3

[0036] Example 3 (HW370)

[0037] will consist of 4 layers of YBCO and 3 layers of cerium oxide (CeO 2 ) multilayer (YBCO / CeO 2 / YBCO / CeO 2 / YBCO / CeO 2 / YBCO) deposited on a single-crystal MgO substrate, including a strontium titanate layer as a buffer layer for MgO, in addition to a lower substrate temperature of 760 °C, under conventional processing conditions using pulsed laser deposition. Each YBCO layer is about 0.55 μm in a total thickness of YBCO of about 2.2 μm. per CeO 2 layer about 30nm. Measured J c About 4.0MA / cm 2 .

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Abstract

Improvements in critical current capacity for superconducting film structures are disclosed and include the use of, e.g., multilayer high temperature barium-copper oxide structures where individual high temperature barium-copper oxide layers are separated by a thin layer of a metal oxide material such as CeO2 and the like.

Description

[0001] Federal Statement of Rights [0002] This invention was made with Government support under Contract No. W-7405-ENG-36 awarded by the US Department of Energy. The government has certain rights in this invention. field of invention [0003] The present invention is concerned with composite structures for obtaining high critical current densities in superconducting film tapes. This composite structure involves a multilayer structure or construction of high critical current superconducting tape. Background of the invention [0004] Since the initial development of coated conductor research, it has focused on increasing the material length while increasing the overall critical current carrying capacity. Several methods for preparing coated conductors have been developed by different research groups. No matter which technology is used to coat the conductor, the purpose is to obtain a highly textured superconducting thick film with a high supercurrent carrying capacity on...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L39/24
CPCH01L39/2422H01L39/128H10N60/858H10N60/0296H10N60/0521H10N60/01
Inventor 斯蒂芬·R·弗泰恩贾全喜汪海燕
Owner LOS ALAMOS NATIONAL SECURITY