Detwinning YBa2Cu3O7−δ thin films

Nam, J.; Hughes, Robert A.; Dąbkowski, A.; Preston, J. S.

doi:10.1063/1.1578166

Cited by 5 publications

(3 citation statements)

References 18 publications

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“…A TEM study of 3-5 µm BaF 2 -derived YBCO films by Wu et al [139] provided evidence for the minor role of twin planes in pinning, pointing instead to a statistically significant correlation between J c and the in-plane lattice parameters. The small contribution of twin planes to pinning in epitaxial YBCO films is also supported by the demonstration of J c > 1 MA cm −2 in de-twinned YBCO films [140].…”

Section: Critical Currents Of Ex Situ Processed Filmsmentioning

confidence: 66%

Growth of thick YBa₂Cu₃O₇layers via a barium fluoride process

Solovyov¹,

Dimitrov²,

Li³

2012

Supercond. Sci. Technol.

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The ex situ process has emerged as a popular technology for growing epitaxial YBa 2 Cu 3 O 7 (YBCO) for the second generation of coated conductors. The process combines low cost, ease of scale-up, the possibility of achieving high critical currents in relatively thick YBCO layers, as well as high tolerances to substrate misalignment. All of these factors explain why the process is increasingly becoming adapted by manufacturing companies for the production of YBCO wires. Studies of the barium fluoride variant of the ex situ process have offered rare insights into the structure, chemistry and pinning in ultra-thick, 5 µm, ex situ YBCO layers. The transition to thick YBCO layers is viewed as one of the key ingredients of the commercial success of the YBCO wire technology, which makes these studies especially relevant. This review is intended to be a comprehensive introduction into the history, physics and chemistry of barium fluoride processing, discussed concomitantly with recent results and trends in this field. Furthermore, comparisons are made between YBCO films made by ex situ and in situ deposition processes.

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Section: Critical Currents Of Ex Situ Processed Filmsmentioning

confidence: 66%

Growth of thick YBa₂Cu₃O₇layers via a barium fluoride process

Solovyov¹,

Dimitrov²,

Li³

2012

Supercond. Sci. Technol.

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“…The beam is sampled using an optical chopper running at 1 KHz. It's then focused down, using a long distance objective, to a diameter of 1.5 yielding a fluence of approximately 5 . The beam lands on a YBCO air bridge that is mounted onto the cold finger of continuous flow optical cryostat, which in turn, is mounted on a xyz-axis motorized translation stage, where each axis has a step resolution and accuracy of 0.…”

Section: Laser Scanning Microscopymentioning

confidence: 99%

“…The extent of the microtwinning in thin films has made it difficult to study the transport properties of individual twin boundaries as the length scales involved are inaccessible to the LSM technique. In this report, we will describe a method to circumvent this difficulty by creating free standing micro-bridges void of grain boundManuscript received October 4, 2004 aries, but with twin boundaries on micrometer, instead of the usual nanometer, length scales [5]. Such twin boundaries are accessible to LSM measurements making these microbridges the perfect candidate for studying the transport properties of isolated twin boundaries.…”

Section: Introductionmentioning

confidence: 98%

Laser Scanning Microscopy Studies on Detwinned<tex>$rm YBa_2rm Cu_3rm O_7-delta$</tex>Thin Films

Nam

Hughes

Dąbkowski

et al. 2005

IEEE Trans. Appl. Supercond.

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YBa 2 Cu 3 O 7 thin films are heavily microtwinned due to the crystal's orthorhombic unit cell and the confining effects of underlying substrate. Single crystal YBCO can be detwinned by thermally annealing the sample while applying uniaxial pressure. A similar technique has been devised to detwin a portion of a YBCO thin film. Through the use of photolithographic techniques, a suspended YBCO microbridge structure is fabricated, but with both ends of the bridge anchored to the substrate. During a subsequent anneal, the ends of the bridge induce a uniaxial stress along its length that arises from the lattice misfit and the thermal expansion coefficient mismatch between YBCO and the underlying materials. Without the confining effects of the substrate the suspended material can either detwin or twin on a macro length scale; the extent of which is largely determined by the substrate material. The ability to produce superconducting YBCO bridges that range from heavily microtwinned, to macrotwinned, to nearly detwinned provides an ideal experimental system. To study these phenomena, an optical and laser scanning microscopy set-up was employed. The images obtained provide insight into the role that twins play in determining the transport properties of superconducting YBCO thin films.

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In-plane and out-of-plane orientations of YBCO and their correlation with a/b-axis twin structures

Zhou,

Chen,

Huang

et al. 2025

Ceramics International

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Detwinning YBa2Cu3O7−δ thin films

Cited by 5 publications

References 18 publications

Growth of thick YBa₂Cu₃O₇layers via a barium fluoride process

Growth of thick YBa₂Cu₃O₇layers via a barium fluoride process

Laser Scanning Microscopy Studies on Detwinned<tex>$rm YBa_2rm Cu_3rm O_7-delta$</tex>Thin Films

In-plane and out-of-plane orientations of YBCO and their correlation with a/b-axis twin structures

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Detwinning YBa2Cu3O7−δ thin films

Cited by 5 publications

References 18 publications

Growth of thick YBa2Cu3O7layers via a barium fluoride process

Growth of thick YBa2Cu3O7layers via a barium fluoride process

Laser Scanning Microscopy Studies on Detwinned&lt;tex&gt;$rm YBa_2rm Cu_3rm O_7-delta$&lt;/tex&gt;Thin Films

In-plane and out-of-plane orientations of YBCO and their correlation with a/b-axis twin structures

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Product

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Growth of thick YBa₂Cu₃O₇layers via a barium fluoride process

Growth of thick YBa₂Cu₃O₇layers via a barium fluoride process

Laser Scanning Microscopy Studies on Detwinned<tex>$rm YBa_2rm Cu_3rm O_7-delta$</tex>Thin Films