Large area YBCO films on polycrystalline substrates with very high critical current densities

AbstractThis article provides an overview of the fabrication of epitaxial, biaxially aligned buffer layers on rolling-assisted biaxially textured substrates (RABiTS) as templates for YBCO films carrying high critical current densities.The RABiTS technique uses standard thermomechanical processing to obtain long lengths of flexible, biaxially oriented substrates with smooth surfaces.The strong biaxial texture of the metal is conferred to the superconductor by the deposition of intermediate metal and/or oxide layers that serve both as a chemical and a structural buffer.Epitaxial YBCO films with critical current densities exceeding 3 106A/cm2at 77K in self-field have been grown on RABiTS using a variety of techniques and demonstrate magnetic-field-dependent critical current values that are similar to those of epitaxial films on single-crystal ceramic substrates.The RABiTS architecture most commonly used consists of a CeO2 (sputtered)/YSZ (sputtered)/Y203 (e-beam)/Ni-W alloy.The desired texture of the base metal has been achieved in 100 m lengths and 10cm widths.Scaleable and cost-effective techniques are also being pursued to deposit the epitaxial multilayers.The results discussed here demonstrate that this technique is a viable route for the fabrication of long lengths of high-critical-current-density wire capable of carrying high currents in magnetic fields and at temperatures accessible by cooling with relatively inexpensive liquid nitrogen (up through the 77K range).

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Superconducting Interconnections in Future High Performance Systems

MRS Proceedings ◽

10.1557/proc-108-27 ◽

1987 ◽

Vol 108 ◽

Cited By ~ 6

Author(s):

R. C. Frye

Keyword(s):

Critical Current ◽

High Speed ◽

High Performance ◽

Electronic Systems ◽

Maximum Current Density ◽

Maximum Current ◽

High Performance Systems ◽

Current Densities ◽

Very High ◽

Scaling Rule

ABSTRACTNew, high temperature superconducting materials could eventually be used for interconnections in electronic systems. Such interconnections would undoubtedly cost more to implement than conventional ones, so the most likely applications would be for complex, high-speed systems that could benefit from the performance advantages of a resistance-free interconnecting medium. The problem with conventional conductors in these systems is that the resistance of wires increases quadratically as dimensions are scaled down. The most important advantage offered by superconductors is that they are not linked to this scaling rule. Their principal limitation is the maximum current density that they will support and this determines the range of applications for which they are superior to conventional conductors. An analysis will be presented which examines the relative advantages of superconductors for different critical current densities, wire dimensions and system sizes.If their critical current densities are adequate, and if they can statisfy a number of processing criteria, then superconductors could find useful applications in a number of high performance electronic systems. The most likely applications will be those demanding very high interconnection densities. Several of these systems will be discussed.

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Seeded infiltration and growth of large, single domain Y–Ba–Cu–O bulk superconductors with very high critical current densities

Superconductor Science and Technology ◽

10.1088/0953-2048/18/11/002 ◽

2005 ◽

Vol 18 (11) ◽

pp. 1421-1427 ◽

Cited By ~ 90

Author(s):

K Iida ◽

N Hari Babu ◽

Y Shi ◽

D A Cardwell

Keyword(s):

Critical Current ◽

Single Domain ◽

Bulk Superconductors ◽

Current Densities ◽

Very High

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MgB2 films with very high critical current densities due to strong grain boundary pinning

Applied Physics Letters ◽

10.1063/1.1805195 ◽

2004 ◽

Vol 85 (14) ◽

pp. 2842-2844 ◽

Cited By ~ 120

Author(s):

H. Kitaguchi ◽

A. Matsumoto ◽

H. Kumakura ◽

T. Doi ◽

H. Yamamoto ◽

...

Keyword(s):

Grain Boundary ◽

Critical Current ◽

Current Densities ◽

Grain Boundary Pinning ◽

Very High

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Properties of<tex>$rm MgB_2$</tex>Films With Very High Transport Critical Current Densities

IEEE Transactions on Applied Superconductivity ◽

10.1109/tasc.2005.848866 ◽

2005 ◽

Vol 15 (2) ◽

pp. 3313-3316 ◽

Cited By ~ 14

Author(s):

H. Kitaguchi ◽

T. Doi ◽

Y. Kobayashi ◽

A. Matsumoto ◽

H. Sosiati ◽

...

Keyword(s):

Critical Current ◽

Current Densities ◽

Very High

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Progress towards a low-cost commercial coated conductor

MRS Proceedings ◽

10.1557/proc-689-e7.7 ◽

2001 ◽

Vol 689 ◽

Author(s):

Suresh Annavarapu ◽

Nguyet Nguyen ◽

Sky Cui ◽

Urs Schoop ◽

Cees Thieme ◽

...

Keyword(s):

Critical Current ◽

High Performance ◽

Low Cost ◽

Critical Currents ◽

Short Length ◽

Coated Conductor ◽

High Quality ◽

Ybco Films ◽

Performance Levels ◽

Current Densities

ABSTRACTYBCO films prepared from metal trifluoroacetate (TFA) precursors on oxide-buffered textured non-magnetic substrates have achieved performance levels equaling that on oxide buffered textured Ni substrates. Critical current densities of 0.7 MA/cm2 to 1.0 MA/cm2 have been achieved in 0.4 µm thick YBCO films on short-length of CeO2/YSZ/Y2O3/Ni/Ni-13wt%Cr substrates. High-quality epitaxial buffers comprising a Ni layer, Y2O3 seed, YSZ barrier and CeO2 cap layers have been deposited over meter long tapes of deformation textured Ni and Ni-13%Cr using reel-to-reel processes. High-performance TFA-based YBCO films have been deposited on 0.1 m to 0.3 m lengths of these oxide buffered substrates using reel to reel processes. Critical current densities up to 1.0 MA/cm2 have been achieved in 0.4 µm thick YBCO films on CeO2/YSZ/Y2O3/Ni substrates. Using multiple coats of the metal trifluoroacetate precursors, thicker YBCO films have been demonstrated on oxide buffered substrates. Critical currents in excess of 100A/cm-width have been achieved for 1.2 µm -1.6 µm thick YBCO films on short lengths of CeO2/YSZ/Y2O3/Ni substrates.

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