Overcoming the barrier to 1000A∕cm width superconducting coatings

Foltyn, S. R.; Wang, H.; Civale, L.; Jia, Q. X.; Arendt, P. N.; Maiorov, B.; Li, Y.; Maley, M. P.; MacManus‐Driscoll, Judith L.

doi:10.1063/1.2106021

Cited by 181 publications

(130 citation statements)

References 26 publications

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“…[85] This has been achieved in short samples via PLD and multilayer structures. [23] That it should be feasible to obtain this benchmark with monolithic YBCO films was recently demonstrated by Solovyov et al, using the ex situ conversion of precursors from the PVD-BaF 2 process to form films of thickness up to 4 lm that carry 800 A (cm-w) -1 at liquid nitrogen temperatures. [110] To date, however, single-layer MOD films thicker than about 1.2 lm exhibit a serious drop off in performance.…”

Section: Thick Film Processingmentioning

confidence: 95%

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: Thick Film Processingmentioning

confidence: 95%

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

et al. 2008

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“…14,15 One of the methods to overcome the J c dependence on the film thickness is to grow alternate layers of CeO 2 and YBCO. 16 Although self-field J c data were improved, a drop in J c with the magnetic field still appears to continue. In addition, as opposed to multiple pulsed laser deposition ͑PLD͒ targets used in this approach, it is advantageous if one target is used to grow thick YBCO films.…”

Section: -13mentioning

confidence: 99%

Thick YBa2Cu3O7−x+BaSnO3 films with enhanced critical current density at high magnetic fields

Varanasi¹,

Burke²,

Wang³

et al. 2008

Applied Physics Letters

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The thickness dependence was studied for the critical current density (Jc) of YBa2Cu3O7−x(YBCO)+BaSnO3 (BSO) nanocomposite films. These films showed a significantly reduced decline of the Jc with thickness, especially at high magnetic fields. For example, a 2 μm thick YBCO+BSO film had a Jc∼3×105 A/cm2 at 5 T as compared to a typical Jc of 2.4×103 A/cm2 at 5 T for a 300 nm thick YBCO film. The thick YBCO+BSO films maintained high Tc (>88 K) and had a high density (2.5×1011/cm2) of continuous BSO nanocolumns that likely contributed for the observed Jc enhancements.

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“…Transmission electron microscopy (TEM) and scanning TEM (STEM) analysis showed the multilayer structure to be uniformly present from top to bottom with almost no secondary phases, such as the RE 2 O 3 inclusions commonly found in monolithic PLD films and the multilayer films discussed earlier. [15,16] The chemically distinct Y123…”

mentioning

confidence: 99%

“…[12] Several reports have shown enhanced properties with regards to multilayer deposition of thick HTS films. In the work of Haugan et al, [4] multiple targets were used to deposit alter- [15] Their multilayers had periodicities on the order of a micrometer and again their process employed multiple targets.…”

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confidence: 99%