Enhanced in-field critical currents of YBCO second-generation (2G) wire by Dy additions

Long, N.J.; Strickland, N. M.; Chapman, B. E.; Ross, N; Xia, J.; Li, X; Zhang, W; Kodenkandath, T.; Huang, Yibing; Rupich, M.W.

doi:10.1088/0953-2048/18/12/030

Cited by 69 publications

(77 citation statements)

References 15 publications

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“…Early work suggested that Dy additions to the MOD films provided significant enhancements in the pinning for Hʈc. [30,103] , respectively) even though the film thicknesses and self-field J c 's were nominally the same.…”

Section: Rare Earth Additions For Flux Pinningmentioning

confidence: 99%

Progress in Nanoengineered Microstructures for Tunable High‐Current, High‐Temperature Superconducting Wires

et al. 2008

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High critical current densities (Jc) in thick films of the Y1Ba2Cu3O7–δ (YBCO, Tc ≈ 92 K) superconductor directly depend upon the types of nanoscale defects and their densities within the films. A major challenge for developing a viable wire technology is to introduce nanoscale defect structures into the YBCO grains of the thick film suitable for flux pinning and the tailoring of the superconducting properties to specific, application‐dependent, temperature and magnetic field conditions. Concurrently, the YBCO film needs to be integrated into a macroscopically defect‐free conductor in which the grain‐to‐grain connectivity maintains levels of inter‐grain Jc that are comparable to the intra‐grain Jc. That is, high critical current (Ic) YBCO coated conductors must contain engineered inhomogeneities on the nanoscale, while being homogeneous on the macroscale. An analysis is presented of the advances in high‐performance YBCO coated‐conductors using chemical solution deposition (CSD) based on metal trifluoroacetates and the subsequent processing to nano‐engineer the microstructure for tuneable superconducting wires. Multi‐scale structural, chemical, and electrical investigations of the CSD film processes, thick film development, key microstructural features, and wire properties are presented. Prospects for further development of much higher Ic wires for large‐scale, commercial application are discussed within the context of these recent advances.

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Section: Rare Earth Additions For Flux Pinningmentioning

confidence: 99%

Progress in Nanoengineered Microstructures for Tunable High‐Current, High‐Temperature Superconducting Wires

et al. 2008

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“…For films grown by MOD, uncorrelated nanoparticles of Y 2 O 3 [7,11], rare-earth oxides [11][12][13], or BaZrO 3 [11,14,15] have been observed. The introduction of these nanoparticles improves the I c for magnetic-field angles away from the parallel direction, but there can be a reduction in planar pinning.…”

Section: Hts Filmmentioning

confidence: 99%

Nanoparticle additions for enhanced flux pinning in YBCO HTS films

Strickland¹,

Long²,

Talantsev³

et al. 2008

Current Applied Physics

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“…Improvements due to Dy doping in MOD -deposited YBCO fi lms were also reported [21] . High density of nanoparticles of (Y, Dy) 2 O 3 10 -50 nm in diameter along with stacking faults and planar defects were observed, and these were proposed to contribute to enhance pinning [22,23] . Eu -doped PLD fi lms exhibited better magnetic fi eld performance at low fi elds than pure YBCO at different orientations [24] .…”

Section: Rare Earth Dopingmentioning

confidence: 99%

Flux Pinning Enhancement in YBa ₂ Cu ₃ O _7–x Films for Coated Conductor Applications

Varanasi

Barnes

2010

High Temperature Superconductors

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5.1 IntroductionCoated conductors are electrical conductors prepared with YBa 2 Cu 3 O 7 -x ( YBCO ) superconducting material coatings deposited on metallic substrates along with several other intermediate buffer layers. Buffer layers are deposited sequentially on the metallic substrates prior to YBCO deposition to serve as barrier layers. They are selected such that epitaxial relationships are maintained throughout the thickness of the coated conductors to obtain highly -textured YBCO coatings. To process conductors with high critical current density ( J c ), highly -textured YBCO coatings with both in -plane and out -of -plane alignment of grains are required with grain boundary misorienation angles below 5 o . More details of the texture requirements, processing, and different types of coated conductor architectures can be found in other chapters of this book as well as in the references [1 -5] . Two primary industrial approaches are used to manufacture the coated conductors. One approach uses a rolling assisted biaxially textured (RABiTS ™ ) metallic substrate such as N -5 at.% W with sputtered Y 2 O 3 /YSZ/Ce 2 O 3 buffer layers and YBCO layer deposited by the metallo -organic deposition ( MOD ) technique [3] . In the second approach, a polycrystalline Hastealloy ™ substrate is coated with textured MgO buffer layer grown by ion beam assisted deposition ( IBAD ) and other subsequent buffer layers [4] . YBCO is deposited by metallo -organic chemical vapor deposition ( MOCVD ) on these substrates. In recent years, impressive progress has been made in the manufacturing of long lengths of YBCO coated conductors processed by using both the RABiTS ™ substrates as well as IBAD substrates [6,7] . Such longlength coated conductors are needed to make coils for rotating machinery and cables for electrical transmission. However, in high magnetic fi eld applications such as MRI (Magnetic Resonance Imaging), SMES (Superconducting Magnetic Energy Storage), superconducting magnets and generators, etc., high J c at high magnetic fi elds needs to be maintained. In the absence of fl ux pinning centers in the coated conductors, the magnetic fl ux lines will move due to Lorenz forces acting upon them at high fi elds. This motion causes dissipation, and losses will occur as a result. This lowers the J c in coated conductors. Hence, it is important High Temperature Superconductors. Edited by Raghu Bhattacharya and M. Parans Paranthaman

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Enhanced in-field critical currents of YBCO second-generation (2G) wire by Dy additions

Cited by 69 publications

References 15 publications

Progress in Nanoengineered Microstructures for Tunable High‐Current, High‐Temperature Superconducting Wires

Progress in Nanoengineered Microstructures for Tunable High‐Current, High‐Temperature Superconducting Wires

Nanoparticle additions for enhanced flux pinning in YBCO HTS films

Flux Pinning Enhancement in YBa ₂ Cu ₃ O _7–x Films for Coated Conductor Applications

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Enhanced in-field critical currents of YBCO second-generation (2G) wire by Dy additions

Cited by 69 publications

References 15 publications

Progress in Nanoengineered Microstructures for Tunable High‐Current, High‐Temperature Superconducting Wires

Progress in Nanoengineered Microstructures for Tunable High‐Current, High‐Temperature Superconducting Wires

Nanoparticle additions for enhanced flux pinning in YBCO HTS films

Flux Pinning Enhancement in YBa 2 Cu 3 O 7–x Films for Coated Conductor Applications

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Flux Pinning Enhancement in YBa ₂ Cu ₃ O _7–x Films for Coated Conductor Applications