Influence of growth condition on magnetic flux pinning in YBa2Cu3Ox single crystals

Asaoka, Hidehito; Kazumata, Yukio; Takei, H.; Noda, K.

doi:10.1016/s0921-4534(97)00155-x

Cited by 3 publications

(4 citation statements)

References 30 publications

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“…Nonetheless, it is not clear whether the twin boundary itself or some elastic strain in the vicinity of the twin boundary works for flux pinning. In either case, however, it is likely that the existence of twin boundaries plays a major role in flux pinning according to the present data as well as those previously reported [9,15,16]. As observed from figure 9, the smaller the value of H in , the higher is the pinning force when H a > H in .…”

Section: Flux Pinning Inside the Y-123 Matrixsupporting

confidence: 86%

“…The effectiveness of twin boundaries in causing a peak effect has also been reported. Torque measurements [27] in magnetic fields and J c measurements of samples with and without twin boundaries confirmed the positive contribution of twin boundaries to the occurrence of a peak effect in J c above 60 K [9,15,16]. In the present study, a difference in the pinning force between twin boundaries of the two different types was found.…”

Section: Changes In the Twin-boundary Structuresupporting

confidence: 82%

“…It has been disputable whether twin boundaries are really effective in flux pinning. Some reports said that twin boundaries were not effective for flux pinning at high magnetic fields [10,13], while others concluded that the J c value of a superconductor was higher with twin boundaries than without at high temperatures (60-77 K) and high magnetic fields (3-4 T) [9,15,16]. Here, we try out d tw (as determined from TEM observations) as a parameter related to flux pinning in the present MGVOP-processed bulk samples.…”

Section: Flux Pinning Inside the Y-123 Matrixmentioning

confidence: 95%

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Role of the twin boundary for the occurrence of peak effect in Y-Ba-Cu-O superconducting bulks melt grown under varied oxygen pressure

Suematsu

Okamura

Nagàya

et al. 1999

Supercond. Sci. Technol.

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A novel melt-growth technique, i.e. melt growth under varied oxygen pressure (MGVOP) in which the oxygen partial pressure is increased to solidify the initial melt, has been employed to prepare melt-textured superconducting bulks of the Y-Ba-Cu-O system. The obtained textured bulk samples consisted of two phases, i.e. superconducting and non-superconducting (Y-211). The critical current density of the samples reached as high as 40 kA (at 65 K) at a high magnetic field of T to exhibit a peak in the versus relation, i.e. a peak effect. To elucidate the causes of the peak effect and the high values of at high magnetic fields, submicron structures of the MGVOP-processed samples were examined by transmission electron microscopy (TEM), and the distributions of both Y-211 particles and twin boundaries were studied. In order to collect sufficient data for statistical analyses, specimens for `large-area TEM observations' were prepared using a focused ion beam thinning technique such that the TEM-observable area of the specimen was as wide as . Statistical analyses of the TEM images yielded the volume fraction of Y-211 phase, the average size of Y-211 grains and the inter-twin-boundary distance for each sample. It was concluded that a sample that had a higher twin-boundary density possessed a higher value at the peak in the versus characteristics, while fine Y-211 particles were likely to contribute to the value only at low magnetic fields.

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Section: Flux Pinning Inside the Y-123 Matrixsupporting

confidence: 86%

Section: Changes In the Twin-boundary Structuresupporting

confidence: 82%

Section: Flux Pinning Inside the Y-123 Matrixmentioning

confidence: 95%

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Role of the twin boundary for the occurrence of peak effect in Y-Ba-Cu-O superconducting bulks melt grown under varied oxygen pressure

Suematsu

Okamura

Nagàya

et al. 1999

Supercond. Sci. Technol.

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“…Asaoka et al found that the RE123 phase can be formed around the RE 2 BaCuO 5 (RE211) phase, and Sandiumenge showed some SAD patterns that indicated parallelism between crystallographic directions of the Y211 precipitate and the Y123 matrix, i.e. RE211 crystals may act as nuclei for the direct liquid phase epitaxy (LPE) growth of REBCO [11,12]. There will be at least two major potential applications if this conclusion can be confirmed.…”

Section: Introductionmentioning

confidence: 99%

Preferential growth of SmBCO on Sm211 whiskers and its dependence upon supersaturation

Zeng¹,

Yao²

2005

J. Phys.: Condens. Matter

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The process of epitaxial growth of the SmBCO phase on the surface of the Sm211 whisker via the peritectic reaction was first observed in situ by high temperature optical microscopy. A preferential epitaxial relation between the SmBCO and Sm211 was demonstrated. From the bonding energy point of view, it was suggested that both 0° and 45° epitaxial relations between them are appropriate. A schematic illustration as regards the growth dependence of 0° and 45° oriented SmBCO on the supersaturation was proposed to illustrate the growth competition between these two types of SmBCO on Sm211 whiskers in this work.

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LT-STM/STS observations on electrical field etched surfaces of YBa2Cu3O7 − single crystal

Murakami

Asaoka

Sakai

et al. 2001

Applied Surface Science

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Influence of growth condition on magnetic flux pinning in YBa2Cu3Ox single crystals

Cited by 3 publications

References 30 publications

Role of the twin boundary for the occurrence of peak effect in Y-Ba-Cu-O superconducting bulks melt grown under varied oxygen pressure

Role of the twin boundary for the occurrence of peak effect in Y-Ba-Cu-O superconducting bulks melt grown under varied oxygen pressure

Preferential growth of SmBCO on Sm211 whiskers and its dependence upon supersaturation

LT-STM/STS observations on electrical field etched surfaces of YBa2Cu3O7 − single crystal

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