High-current Y-Ba-Cu-O coated conductor using metal organic chemical-vapor deposition and ion-beam-assisted deposition

Selvamanickam, V.; Carota, G; Funk, M.; Vo, N. V.; Haldar, Pradeep; Balachandran, U.; Chudzik, M.; Arendt, P. N.; Groves, J. R.; DePaula, R.F.; Newnam, Brian E.

doi:10.1109/77.919787

Cited by 51 publications

(32 citation statements)

References 5 publications

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“…The IBAD sample was deposited on a Hastelloy C-276 substrate that is 50-μm thick. The 1 μm thick YBCO superconducting layer was deposited on top of the buffer layers by MOCVD [23], [24]. Such a deposition route results in a twinned superconducting film that is oriented with the [100] and [010] directions along the tape axis [20], [21].…”

Section: Methodsmentioning

confidence: 99%

Correlation Between In-Plane Grain Orientation and the Reversible Strain Effect on Flux Pinning in RE-$\hbox{Ba}_{2}\hbox{Cu}_{3}\hbox{O}_{7 - \delta}$ Coated Conductors

Laan

Douglas

Goodrich

et al. 2012

IEEE Trans. Appl. Supercond.

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The uniaxial pressure dependence of the critical temperature causes a reversible effect of strain on the critical current density and the flux pinning strength in many high-temperature superconductors. Recent experiments on patterned coated conductor bridges have shown that the anisotropic nature of the pressure dependence of the critical temperature of rare earth (RE)-Ba 2 Cu 3 O 7−δ (REBCO) has a major impact on the performance of coated conductors under strain. The strain effect on the critical current density is most prominent when the strain is along the [100] and [010] directions of the superconducting film, whereas it almost completely disappears when the strain is along [110]. In this paper, we investigate the correlation between the uniaxialpressure dependence of the critical temperature and the reversible strain effect on flux pinning in REBCO coated conductors. We show that axial strain has a large effect on the irreversibility field and the pinning force in coated conductors when the [100] and [010] directions of the superconducting film are aligned along the conductor axis. The magnitude of the strain effect in these conductors largely depends on the angle at which the magnetic field is applied. On the other hand, the critical temperature is not expected to change with the axial strain in coated conductors when the [110] direction is aligned along the conductor axis. Indeed, the irreversibility field and the magnetic field dependence of the pinning force of these conductors are almost independent of the axial strain for all angles at which the magnetic field is applied. The minor strain dependence of the critical current measured in these conductors could be caused by the average in-plane grain misalignment of between 6 • and 8 • , which causes a slight variation in the strain alignment with the axes of the superconducting film. The results confirm that the reversible strain effect in REBCO coated conductors is largely determined by the uniaxial pressure dependence of the critical temperature.

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Section: Methodsmentioning

confidence: 99%

Correlation Between In-Plane Grain Orientation and the Reversible Strain Effect on Flux Pinning in RE-$\hbox{Ba}_{2}\hbox{Cu}_{3}\hbox{O}_{7 - \delta}$ Coated Conductors

Laan

Douglas

Goodrich

et al. 2012

IEEE Trans. Appl. Supercond.

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“…Films grown by MOCVD have been observed to be dense and uniform [63] though with a "dead layer" near the surface which does not carry a significant amount of current [64]. Little further investigation of grain networks in MOCVD films has been carried out to date.…”

Section: Chemical Growth Methods On Ibad Substratesmentioning

confidence: 99%

Importance of low-angle grain boundaries in YBa₂Cu₃O_7−δcoated conductors

Durrell¹,

Rutter²

2008

Supercond. Sci. Technol.

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Abstract. Over the past ten years the perception of grain boundaries in YBa 2 Cu 3 O 7−δ conductors has changed greatly. They are no longer a problem to be eliminated but an inevitable and potentially favourable part of the material. This change has arisen as a consequence of new manufacturing techniques which result in excellent grain alignment, reducing the spread of grain boundary misorientation angles. At the same time there is considerable recent evidence which indicates that the variation of properties of grain boundaries with mismatch angle is more complex than a simple exponential decrease in critical current. This is due to the fact that low-angle grain boundaries represent a qualitatively different system to high angle boundaries. The time is therefore right for a targetted review of research into low-angle YBa 2 Cu 3 O 7−δ grain boundaries. This article does not purport to be a comprehensive review of the physics of grain boundaries as found in YBa 2 Cu 3 O 7−δ in general; for a broader overview we would recommend that the reader consult the comprehensive review of Hilgenkamp and Mannhart (Rev. Mod. Phys., 74, 485, 2002). The purpose of this article is to review the origin and properties of the low-angle grain boundaries found in YBa 2 Cu 3 O 7−δ coated conductors both individually and as a collective system.

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“…No evidence of loose or soft structure in these YBCO thick films could be found from these SEM images. Since it is well known that soft or loose film structure with voids (so-called "dead layer") was always found at or near the surface of the YBCO films as film thickness becoming thicker than about 1 m by using deposition techniques other than PhA-MOCVD, such as pulsed laser deposition or conventional MOCVD [4], [14]. This kind of "dead layer" results in degradation of crystal structure, and then a reduction of critical current density .…”

Section: Resultsmentioning

confidence: 99%

Microstructures of epitaxial YBa/sub 2/Cu/sub 3/O/sub 7-δ/ thick films grown by photoassisted metal-organic chemical vapor deposition

Zeng

Chou

Ignatiev

et al. 2003

IEEE Trans. Appl. Supercond.

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Epitaxial, high-quality YBa 2 Cu 3 O 7 (YBCO) thick films were grown by a photoassisted metal-organic chemical vapor deposition technique with a single liquid precursor delivery system, and characterized by X-ray diffraction (XRD), scanning electron microscopy, and low-high-resolution transmission electron microscopy techniques. Very dense and single-crystal-like film structure was observed in all of these YBCO thick films. Large precipitates on these thick films were identified as BaCu 3 O 4 , sprinkled only at surface of these YBCO thick films. YBCO thick films with high crystalline and superconductive quality were confirmed by data of XRD analyses and superconductivity measurements. At the same time, the reason why epitaxial YBCO thick films with high-quality single-crystal-like structure can be grown up to about 4.5 m thick is illustrated from the point of view of photoactivation. It is also found that these thick films were optimally oxygenated with their superconductive properties in concern.Index Terms-High-resolution transmission electron microscopy (HRTEM), metal-organic chemical vapor deposition (MOCVD), microstructure, thick films, YBa 2 Cu 3 O 7 (YBCO).

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High-current Y-Ba-Cu-O coated conductor using metal organic chemical-vapor deposition and ion-beam-assisted deposition

Cited by 51 publications

References 5 publications

Correlation Between In-Plane Grain Orientation and the Reversible Strain Effect on Flux Pinning in RE-$\hbox{Ba}_{2}\hbox{Cu}_{3}\hbox{O}_{7 - \delta}$ Coated Conductors

Correlation Between In-Plane Grain Orientation and the Reversible Strain Effect on Flux Pinning in RE-$\hbox{Ba}_{2}\hbox{Cu}_{3}\hbox{O}_{7 - \delta}$ Coated Conductors

Importance of low-angle grain boundaries in YBa₂Cu₃O_7−δcoated conductors

Microstructures of epitaxial YBa/sub 2/Cu/sub 3/O/sub 7-δ/ thick films grown by photoassisted metal-organic chemical vapor deposition

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High-current Y-Ba-Cu-O coated conductor using metal organic chemical-vapor deposition and ion-beam-assisted deposition

Cited by 51 publications

References 5 publications

Correlation Between In-Plane Grain Orientation and the Reversible Strain Effect on Flux Pinning in RE-$\hbox{Ba}_{2}\hbox{Cu}_{3}\hbox{O}_{7 - \delta}$ Coated Conductors

Correlation Between In-Plane Grain Orientation and the Reversible Strain Effect on Flux Pinning in RE-$\hbox{Ba}_{2}\hbox{Cu}_{3}\hbox{O}_{7 - \delta}$ Coated Conductors

Importance of low-angle grain boundaries in YBa2Cu3O7−δcoated conductors

Microstructures of epitaxial YBa/sub 2/Cu/sub 3/O/sub 7-δ/ thick films grown by photoassisted metal-organic chemical vapor deposition

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Importance of low-angle grain boundaries in YBa₂Cu₃O_7−δcoated conductors