Angular Behavior of Jc in GdBCO-Coated Conductors With Crossed Columnar Defects Around ab Plane

Sueyoshi, Tetsuro; Iwanaga, Yasuya; Fujioyoshi, Takanori; Takai, Yohsuke; Mukaida, Masashi; Kudo, Masaki; Yasuda, Kazuhiro; Ishikawa, N.

doi:10.1109/tasc.2016.2637338

Cited by 9 publications

(4 citation statements)

References 17 publications

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“…In order to clarify the influence of the morphologies of CDs on the angular dependence of J c , similar configurations of CDs were also prepared by using 270 MeV Xe ion irradiation which forms continuous CDs in all directions. 17)…”

Section: Introductionmentioning

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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Section: Introductionmentioning

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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“…In general, a trapping angle ω t of c-axis correlated PCs is defined as the angle of the minimum in angular dependence of J c in TMF [25]. According to this approach, the value of ω t for CDs parallel to the c-axis is about 65 • for C00 in this work (see figure 4) and GdBCO coated conductors including CDs along the c-axis in our previous work [35]. By using this value of ω t for CDs parallel to the c-axis and γ = 5 together with equations ( 1) and ( 2), we can estimate the value of ω t for CDs tilted at an angle of Θ relative to the 'ab-plane'.…”

Section: Resultsmentioning

confidence: 85%

Tuning critical current density properties of YBa₂Cu₃O _y thin films under longitudinal magnetic field by using heavy-ion irradiation

Sueyoshi,

Enokihata,

Yamaguchi

et al. 2024

Supercond. Sci. Technol.

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We attempted to improve the critical current density J c under a longitudinal magnetic field (LMF) by using columnar defects (CDs) tilted toward the transport current, where the CDs were produced with 80 MeV Xe ions at an incident angle(s) up to φ i = 87.5° relative to the c-axis of YBa2Cu3O y thin films. The formation of CDs extending throughout the film was confirmed by cross-sectional transmission electron microscopy. The CDs tilted at φ i = 87.5° weakened the magnetic field dependence of J c under the LMF, providing a J c higher than that of the unirradiated film in a high magnetic field. This is the first study to demonstrate that CDs and/or irradiation defects contribute to flux pinning under the LMF in high-T c superconductors. In addition, the J c under LMF was sensitive to the tilt angle of the CDs: the J c was reduced by CDs tilted not only at φ i = 0°, but also at a slightly larger angle relative to the ab-plane, i.e. φ i = 85°. The introduction of CDs rather disturbs the LMF effect because of the large volume passing through the film thickness, unless the tilt angles of the CDs are within the narrow angular region effective for the LMF effect.

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“…the kinked vortex is formed at θ>67.1°for Cr30 at 60 K, which roughly coincides with the angle region where the n-value shows a dip around B || ab. These results indicates that the flux line dynamics around B || ab is substantially affected by the intrinsic PCs rather than by the crossed CDs: the crossing angle of θ i =±30°is the obtuse angle of ±60°relative to the ab-plane, which is so large that the crossed CDs cannot interact with the flux lines for B || ab [16,17].…”

Section: Resultsmentioning

confidence: 90%

“…Recently, we reported the influence of crossed CDs on J c at B || ab as a function of the crossing angle of CDs, where the CDs were introduced by heavy-ion beams tilted with respect to the ab-plane in GdBCO coated conductors [16,17]. It was demonstrated that crossed CDs are hard to increase the J c at B || ab, even though the crossing angle is relatively low with respect to the ab-plane.…”

Section: Introductionmentioning

confidence: 99%

Angular behavior of flux dynamics in YBCO films with crossed columnar defects around the ab-plane

Sueyoshi

Furuki

Fujiyoshi

et al. 2018

Supercond. Sci. Technol.

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We systematically investigated the influence of columnar defects (CDs) on the flux dynamics around B || ab in YBa 2 Cu 3 O 7-δ (YBCO) films, where two types of the crossed CD configurations with the crossing angle relative to the c-axis, θ i =±30°and ±60°, were prepared by using 200 MeV Xe ion irradiation. The crossed CDs with θ i =±30°induce a peak of critical current density J c centered at B || c, which suggests a typical entanglement state of flux lines. The J c at B || ab, by contrast, is insensitive to the crossed CDs with θ i =±60°, which are crossing at ±30°around the ab-plane. In addition, the behaviors of the glass-liquid transition temperature T g and the dynamic critical exponent z indicate that the VG state develops at B || ab not only for θ i =±30°but also for θ i =±60°. The difference in the contribution of CDs to the flux dynamics for between θ i =±30°and ±60°also stands out at B || CDs, where the magnetic field for θ i =±60°is more tilted toward the ab-plane: the J c peak at B || CDs occurs in any magnetic field for θ i =±60°, whereas the correlated pinning state disappears in high magnetic fields for θ i =±30°. These results suggest that the pinning by CDs is angle-dependent due to the flux line structure with strong line tension around B || ab: CDs around the ab-plane can trap flux lines along their long axis only in much narrower angular-range, in comparison with CDs around the c-axis.

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Angular Behavior of Jc in GdBCO-Coated Conductors With Crossed Columnar Defects Around ab Plane

Cited by 9 publications

References 17 publications

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

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

Tuning critical current density properties of YBa₂Cu₃O _y thin films under longitudinal magnetic field by using heavy-ion irradiation

Angular behavior of flux dynamics in YBCO films with crossed columnar defects around the ab-plane

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Angular Behavior of Jc in GdBCO-Coated Conductors With Crossed Columnar Defects Around ab Plane

Cited by 9 publications

References 17 publications

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

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

Tuning critical current density properties of YBa2Cu3O y thin films under longitudinal magnetic field by using heavy-ion irradiation

Angular behavior of flux dynamics in YBCO films with crossed columnar defects around the ab-plane

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Tuning critical current density properties of YBa₂Cu₃O _y thin films under longitudinal magnetic field by using heavy-ion irradiation