Influence of Discontinuous Columnar Defects on Flux Pinning Properties in GdBCO Coated Conductors

Sueyoshi, Tetsuro; Kotaki, T.; Furuki, Yuuichi; Uraguchi, Y.; Kai, Tomoaki; Fujiyoshi, T.; Shimada, Yusuke; Yasuda, Kazuhiro; Ishikawa, N.

doi:10.1109/tasc.2014.2374554

Cited by 12 publications

(16 citation statements)

References 13 publications

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“…The J c of samples having a small B Φ decreases more at temperatures below 77 K, under an applied magnetic field, than that of a sample with larger B Φ . 26 In this study, the 6.4 T B Φ of the T s = 720 • C film is significantly higher than the applied magnetic field of 3 T. This B Φ also exceeds the range of fields (2-5 T) required for the operation of HTS coil-based practical applications. Consequently, the high-B Φ discontinuous BHO nano-rods also exert a 3D-like flux pinning at a low operating temperature of 40 K. Figure 5(a) shows the J c (B//c) of the T s = 720…”

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confidence: 59%

“…9,25 In a previous study, discontinuous-and continuous-CDs were transformed into REBCO CCs via heavy-ion irradiation with 80 MeV and 270 MeV Xe ions, respectively. 26 The films consisting of discontinuous CDs exhibited higher J c along all directions of the magnetic field, in contrast to those consisting of continuous CDs under a lower magnetic field than matching field B Φ . The superior J c performance of the former, compared to that of the latter, is especially pronounced at temperatures below the temperature of liquid nitrogen.…”

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confidence: 87%

“…At high temperatures, the effect of thermal fluctuations on the flux pinning would become large due to the discontinuity of the CDs. 26 The discontinuity is also the reason for the low J c at 77 K under various field directions.…”

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confidence: 96%

“…26, the discontinuity of the CDs gives rise to 3D-like flux pinning, whose strength depends on the number density of the CDs. The J c of samples having a small B Φ decreases more at temperatures below 77 K, under an applied magnetic field, than that of a sample with larger B Φ .…”

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confidence: 99%

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Improvement in Jc performance below liquid nitrogen temperature for SmBa2Cu3Oy superconducting films with BaHfO3 nano-rods controlled by low-temperature growth

et al. 2016

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For use in high-magnetic-field coil-based applications, the critical current density (Jc) of REBa2Cu3Oy (REBCO, where RE = rare earth) coated conductors must be isotropically improved, with respect to the direction of the magnetic field; these improvements must be realized at the operating conditions of these applications. In this study, improvement of the Jc for various applied directions of magnetic field was achieved by controlling the morphology of the BaHfO3 (BHO) nano-rods in a SmBCO film. We fabricated the 3.0 vol. % BHO-doped SmBCO film at a low growth temperature of 720 °C, by using a seed layer technique (Ts = 720 °C film). The low-temperature growth resulted in a morphological change in the BHO nano-rods. In fact, a high number density of (3.1 ± 0.1) × 103 μm−2 of small (diameter: 4 ± 1 nm), discontinuous nano-rods that grew in various directions, was obtained. In Jc measurements, the Jc of the Ts = 720 °C film in all directions of the applied magnetic field was higher than that of the non-doped SmBCO film. The Jcmin (6.4 MA/cm2) of the former was more than 6 times higher than that (1.0 MA/cm2) of the latter at 40 K, under 3 T. The aforementioned results indicated that the discontinuous BHO nano-rods, which occurred with a high number density, exerted a 3D-like flux pinning at the measurement conditions considered. Moreover, at 4.2 K and under 17 T, a flux pinning force density of 1.6 TN/m3 was realized; this value was comparable to the highest value recorded, to date.

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confidence: 87%

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confidence: 96%

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Improvement in Jc performance below liquid nitrogen temperature for SmBa2Cu3Oy superconducting films with BaHfO3 nano-rods controlled by low-temperature growth

et al. 2016

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“…4,5) When CDs are shortly segmented (i.e. discontinuous), on the other hand, the linearity and the discontinuity of the CDs provide more effective flux pinning in a wide angular range: the ends of the discontinuous CDs act as effective PCs except for B || c, [6][7][8] while a sort of splay effect is induced due to the existence of gaps in the segmented CDs at B || c. 9) Moreover, reduction of the superconducting area due to the presence of PCs can be minimized for discontinuous CDs, which leads to an upward shift of the absolute J c value in the whole angular region. [7][8][9] Therefore, discontinuous CDs can be one kind of promising PCs to approach the pair-breaking critical current density.…”

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confidence: 99%

Strong flux pinning by columnar defects with directionally dependent morphologies in GdBCO-coated conductors irradiated with 80 MeV Xe ions

Sueyoshi¹,

Kotaki²,

Furuki³

et al. 2020

Jpn. J. Appl. Phys.

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We show that Xe ion irradiation with 80 MeV to GdBa2Cu3Oy-coated conductors creates different morphologies of columnar defects (CDs) depending on the irradiation angles θi relative to the c-axis: continuous CDs with a larger diameter are formed for oblique irradiation at θi = 45°, whereas the same ion beam at a different angle (θi = 0°) induces the formation of discontinuous CDs. The direction-dependent morphologies of CDs significantly affect the angular behavior of the critical current density Jc. In particular, low-energy irradiation defects induce further improvement of Jc in a unique combination of irradiation angles of θi = 0° and ±45°: discontinuous CDs at θi = 0° and crossed CDs at θi = ±45° provide correlated pinning in a wide angular range, which is more strongly enhanced by each other via the pinning of kinks.

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Flux pinning properties in YBCO films with growth-controlled nano-dots and heavy-ion irradiation defects

Sueyoshi

Kotaki

Uraguchi

et al. 2016

Physica C: Superconductivity and its Applications

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Influence of Discontinuous Columnar Defects on Flux Pinning Properties in GdBCO Coated Conductors

Cited by 12 publications

References 13 publications

Improvement in Jc performance below liquid nitrogen temperature for SmBa2Cu3Oy superconducting films with BaHfO3 nano-rods controlled by low-temperature growth

Improvement in Jc performance below liquid nitrogen temperature for SmBa2Cu3Oy superconducting films with BaHfO3 nano-rods controlled by low-temperature growth

Strong flux pinning by columnar defects with directionally dependent morphologies in GdBCO-coated conductors irradiated with 80 MeV Xe ions

Flux pinning properties in YBCO films with growth-controlled nano-dots and heavy-ion irradiation defects

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