Understanding High Critical Currents in YBa2Cu3O7Thin Films and Coated Conductors

Civale, L.; Maiorov, B.; Serquis, A.; Willis, J. O.; Coulter, J.Y.; Wang, H.; Jia, Quanxi; Arendt, P. N.; Jaime, M.; MacManus‐Driscoll, Judith L.; Maley, M. P.; Foltyn, S. R.

doi:10.1023/b:jolt.0000016966.07449.d1

Cited by 90 publications

(77 citation statements)

References 14 publications

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“…To attain such properties in the most suitable fashion for the many individual ways in which YBCO is presently made today, whether by in situ methods such as PLD, metal organic chemical vapor deposition, or electron-beam evaporation, or by ex situ methods such as the BaF 2 route or metal organic deposition ͑MOD͒, means that many types of strategy for maximizing J c may be employed. One message of the present study is that attention to the in-field pinning performance rather than to J c sf or the low-field ␣ pinning parameter 45 will be important to maximize the pinning efficiency of YBCO.…”

Section: Discussionmentioning

confidence: 97%

Influence of growth temperature on the vortex pinning properties of pulsed laser deposited YBa2Cu3O7−x thin films

Chen

Kametani

Kim

et al. 2008

Journal of Applied Physics

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Epitaxial high-temperature superconducting YBa 2 Cu 3 O 7−x thin films grown on 2°miscut ͑001͒ ͑LaAlO 3 ͒ 0.3 -͑SrAl 0.5 Ta 0.5 O 3 ͒ 0.7 substrates by pulsed laser deposition show significant and systematic changes in flux pinning properties on changing the substrate temperature from 730 to 820°C. The bulk pinning force is highest for the 760°C growth, rising to a maximum of 4.4 GN/ m 3 at 77 K, though there are indications that vortex pinning strength is even higher for the 730°C growth once allowance for the current-blocking effects of a-axis oriented grains is made. Cross-sectional transmission electron microscope images show that the density of antiphase boundaries, stacking faults, and edge dislocations increases strongly with decreasing growth temperature, and is highest at 730°C. In spite of the enhanced density of the pinning defects mentioned above, their vortex pinning effect is still much smaller than for insulating nanoparticles of high density and optimum size, where pinning forces can be four to five times higher.

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Section: Discussionmentioning

confidence: 97%

Influence of growth temperature on the vortex pinning properties of pulsed laser deposited YBa2Cu3O7−x thin films

Chen

Kametani

Kim

et al. 2008

Journal of Applied Physics

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“…The measurements of the angular dependence of J c in applied magnetic fields provides a unique tool for this purpose, as each type of defect produces a characteristic pinning anisotropy. [96,97] As an example, the J c in a 5 T field as a function of the field orientation at 75 K is shown in Figure 10a for a 0.9 lm MOD stoichiometric YBCO film on a textured metal template. Figure 10b shows analogous data for a 1.1 lm PLD YBCO film on a single crystal SrTiO 3 substrate.…”

Section: Single-layer Mod Ybco Filmsmentioning

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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“…Angular measurements of I c in applied magnetic fields are a unique tool for characterizing the pinning structure of superconducting films, as each type of defect produces a characteristic anisotropic pinning effect. [25,26] The asymmetry seen in Figure 3b in the angular dependence measurements at 1 T at 75.5 K is due to a small tilt (ca. 2-5°) in the alignment of the IBAD MgO template relative to the surface normal.…”

mentioning

confidence: 93%

Ultrafine Multilayers of Complex Metal Oxide Films

et al. 2007

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Understanding High Critical Currents in YBa₂Cu₃O₇Thin Films and Coated Conductors

Cited by 90 publications

References 14 publications

Influence of growth temperature on the vortex pinning properties of pulsed laser deposited YBa2Cu3O7−x thin films

Influence of growth temperature on the vortex pinning properties of pulsed laser deposited YBa2Cu3O7−x thin films

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

Ultrafine Multilayers of Complex Metal Oxide Films

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