Combined effect of flux pinning by three-directional columnar defects in a field-angular region of high-Tc superconductors

Sueyoshi, Tetsuro; Enokihata, Ryusei; Hidaka, Yuka; Irie, Masahiro; Fujiyoshi, T.; Okuno, Yasuki; Ishikawa, N.

doi:10.1016/j.physc.2021.1353824

Cited by 3 publications

(3 citation statements)

References 24 publications

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“…In contrast, the J c of S85 is slightly lower than that of C87 at B || c. In the case of B || c, CDs for the both samples are tilted at large angles relative to the flux lines, but are not perpendicular to the magnetic field. Such CDs not only provide flux pinning through numerous intersection points between CDs and flux lines, but also induce the motion of flux lines along the length of CDs at B || c [32,33]. In addition, S85 includes a larger number of largely tilted CDs than C87.…”

Section: Resultsmentioning

confidence: 99%

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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Section: Resultsmentioning

confidence: 99%

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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“…Elena et al [134] demonstrated that continuous CDs with large diameter are formed at higher Se (higher energy heavy ions, 167 MeV Xe ions) and discontinuous CDs with 10-15 nm length thin diameter are located at intervals along the ion path at medium Se (medium energy heavy ions, 77 MeV Xe ions) and spheroids of diameter 5 nm are formed at lower Se (lower energy heavy ions, 46 MeV Xe ions). Numerous studies have employed heavy ion irradiation techniques focused on the creation of columnar defects at normal [135]- [137] as well as inclined angles [138]- [141] and demonstrated effective Ic enhancement when the magnetic field is aligned with the irradiated angles. However, these works are mostly concentrated in the demonstrations of Ic enhancement, mainly focussing on field angle applied parallel to ion tracks or measurements at liquid nitrogen temperature.…”

Section: Ion Irradiation Techniquementioning

confidence: 99%

“…And there exists no likelihood of the temperature escalating to 400°C or higher during irradiation. Furthermore, existing research indicates the presence of symmetric peaks resulting from inclined irradiations at various angles [138][139] [189]. Consequently, it appears that the most probable explanation for this observed asymmetry lies in experimental errors associated with the irradiation area during the transition from +30° to -30° angles, which could lead to a lower fluence during the second angle irradiation, creating a pinning landscape contributing to the observed discrepancy.…”

Section: Composite Pinning Landscape By Inclined Incidence Silver Irr...mentioning

confidence: 99%

An ion-beam engineered microstructure for high-performance superconducting films

Ambadiyil Soman

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High-temperature superconductors, distinguished by their exceptional properties, stand as leading candidates for a broad spectrum of applications addressing global challenges. However, the suitability of these materials depends upon the critical current performance under the specific conditions required for each application.The critical current of a superconductor is determined by flux pinning — the interaction between nanometre-scale structural defects and the vortex matter — and varies strongly with temperature, magnetic field, and field orientation. Different defect structures with distinct pinning characteristics can interact in ways that either strengthen or weaken the overall pinning effect, but not necessarily in a straightforwardly additive manner. The best possible critical current performance under particular operating conditions requires an optimal pinning landscape tailored to those conditions.This thesis employs ion irradiation as the material modification tool to systematically probe how controlled populations of point (0D), linear (1D), planar (2D), and spherical (3D) microstructural defects combine to pin magnetic flux vortices at different orientations and densities in REBCO-coated conductors. Ion irradiation allows the incorporation of defects independently of the existing microstructure, enabling control over dimensionality, density, and orientation through selecting appropriate ion energy, fluence, and angle of incidence, respectively.Critical current measurement studies on samples irradiated with different ions and energies showed that under a low temperature, high magnetic field regime, for example, at 20 K, 8 T, an optimal isotropic critical current enhancement factor in the range of 2 – 3 can be realised through different types of irradiations, including proton irradiation, irradiation with gold ions of energy 18 MeV, and silver ions with energies ranging from 50 MeV to 150 MeV. Critical current studies at higher temperatures revealed distinct regimes of defect dimensionality as the energy of the silver ions increased from 50 MeV to 150 MeV. It was found that at 65 K, 8 T, irradiation with silver ions in the energy range of 75 – 150 MeV, creating columnar tracks, offers a greater c-axis peak enhancement ranging from a factor 3 to 3.6, whereas 50 MeV irradiation creating spherical defects exhibited a nearly isotropic enhancement of a lower factor of ~2. A composite pinning landscape formed by triple irradiation using 75 MeV silver ions at 0°, +60°, and −60° angles, creating a combination of segmented columnar and spherical defects, demonstrated superior effectiveness in reducing critical current anisotropy and higher critical current performance compared to single or double irradiations at different angles. The extensive experimental data on individual incorporation of defects and different combinations of defects over a wide range of temperatures (20 – 77.5 K), magnetic fields (0 – 8 T), and field orientations (0° – 360°) provides significant materials engineering knowledge that will guide performance improvements in commercial superconducting wires and accelerate the widespread uptake of HTS technology.

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Improvement in the superconducting properties of YBa2Cu3O7-d material via PbO addition

Slimani

Zouaoui

Salem

et al. 2023

J Mater Sci: Mater Electron

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Combined effect of flux pinning by three-directional columnar defects in a field-angular region of high-Tc superconductors

Cited by 3 publications

References 24 publications

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

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

An ion-beam engineered microstructure for high-performance superconducting films

Improvement in the superconducting properties of YBa2Cu3O7-d material via PbO addition

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Combined effect of flux pinning by three-directional columnar defects in a field-angular region of high-Tc superconductors

Cited by 3 publications

References 24 publications

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

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

An ion-beam engineered microstructure for high-performance superconducting films

Improvement in the superconducting properties of YBa2Cu3O7-d material via PbO addition

Contact Info

Product

Resources

About

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

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