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

Sueyoshi, Tetsuro; Kotaki, T.; Furuki, Yuichi; Fujiyoshi, T.; Semboshi, Satoshi; Ozaki, Toshinori; Sakane, Hitoshi; Kudo, Masaki; Yasuda, Kazuhiro; Ishikawa, N.

doi:10.35848/1347-4065/ab6f2b

Cited by 7 publications

(9 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The angular dependence of the double irradiated sample at ±30° can be fitted by three Lorentzian 3) give a combined effect to give a single strong and broad peak at ~15° and ~150°. This is expected since ±30° irradiated defects are oriented closer to c-axis peaks, giving a combined benefit to angles closer to the c-axis peaks and aligning with the results of studies on inclined angle irradiations [140][141] [190]. As in single 30° irradiation, the Gaussian components are not observed, which is masked by the strong and broad Lorentzian components due to the irradiated defects at ±30° indicating the dominancy of pinning by irradiated defects over the pinning benefit by defects with weak c-axis bias present in the pristine sample.…”

Section: Maximum Entropy Model Fitssupporting

confidence: 70%

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

Ambadiyil Soman

View full text Add to dashboard Cite

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.

show abstract

Section: Maximum Entropy Model Fitssupporting

confidence: 70%

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

Ambadiyil Soman

View full text Add to dashboard Cite

show abstract

“…27) Therefore, the present results are remarkable in finding that c-axis-directed 1D pins are effective for enhancing J c sf values at 77 K of YBCO, not only in the 100 kA cm −2 -order of bulk samples but also in the MA cm −2 -order of film samples. It is worth noting that in YBCO films and related materials, J c at 77 K in applied magnetic fields has been enhanced by continuous 11) and/or discontinuous 26,28) 1D irradiation defects in the order of 100 kA cm −2 .…”

Section: Resultsmentioning

confidence: 99%

Enhancement of self-field critical current density by several-tens-MeV ion irradiation in YBa₂Cu₃O₇ films prepared by fluorine-free metal-organic deposition

Matsui

Yamaguchi

2022

Jpn. J. Appl. Phys.

View full text Add to dashboard Cite

An up-to 63% enhancement in critical current density (Jc) was achieved for 1-μm-thick YBa2Cu3O7 (YBCO) films at self-field at 77 K by irradiation with 24-84 MeV Au ions. This enhancement is highly unusual, since in YBCO films, Jc at self-field (Jc sf) is generally insensitive to ion irradiation, unlike Jc in magnetic fields. Our observed film-thickness dependence of the irradiation effect and our microstructure imaging indicate that this rare observation is attributed to an extremely “clean” (i.e., less-disordered) microstructure in the top 700-nm of the layer of our 1-μm-thick films prepared via fluorine-free metal-organic deposition. Our results directly indicate that discontinuous 1D vortex-pinning centers (pins) that have the following features effectively enhance MA/cm2-order Jc sf at 77 K of YBCO films; namely, 5-10 nm in diameter, ~20 nm in size along a pin track, have a ~20 nm gap between the pins in a pin track, and are directed in the c-axis.

show abstract

“…The ion irradiation is a useful tool to generate the desired defect structure. Depending on the ion species, ion energy and the properties of the target materials, ion irradiation enables the creation of defects with well-controlled morphology and density, such as point [8], cluster [9][10][11][12] and columnar [13][14][15] defects. Early works on the ion irradiation of cuprate (Cu-O based) high-T c superconductors (HTS) for improving J c in the magnetic field have mostly focused on the high-energy, over hundreds of MeV, heavy ion irradiation [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

“…Depending on the ion species, ion energy and the properties of the target materials, ion irradiation enables the creation of defects with well-controlled morphology and density, such as point [8], cluster [9][10][11][12] and columnar [13][14][15] defects. Early works on the ion irradiation of cuprate (Cu-O based) high-T c superconductors (HTS) for improving J c in the magnetic field have mostly focused on the high-energy, over hundreds of MeV, heavy ion irradiation [13][14][15]. At this energy range, the irradiation of superconducting materials by the swift heavy ion mainly causes electronic excitation and ionization of the target atoms.…”

Section: Introductionmentioning

confidence: 99%

Effect of 1.5 MeV Proton Irradiation on Superconductivity in FeSe0.5Te0.5 Thin Films

Ozaki

Kashihara

Kakeya

et al. 2021

QuBS

Self Cite

View full text Add to dashboard Cite

Raising the critical current density Jc in magnetic fields is crucial to applications such as rotation machines, generators for wind turbines and magnet use in medical imaging machines. The increase in Jc has been achieved by introducing structural defects including precipitates and vacancies. Recently, a low-energy ion irradiation has been revisited as a practically feasible approach to create nanoscale defects, resulting in an increase in Jc in magnetic fields. In this paper, we report the effect of proton irradiation with 1.5 MeV on superconducting properties of iron–chalcogenide FeSe0.5Te0.5 films through the transport and magnetization measurements. The 1.5 MeV proton irradiation with 1 × 1016 p/cm2 yields the highest Jc increase, approximately 30% at 5–10 K and below 1 T without any reduction in Tc. These results indicate that 1.5 MeV proton irradiations could be a practical tool to enhance the performance of iron-based superconducting tapes under magnetic fields.

show abstract

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

Cited by 7 publications

References 27 publications

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

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

Enhancement of self-field critical current density by several-tens-MeV ion irradiation in YBa₂Cu₃O₇ films prepared by fluorine-free metal-organic deposition

Effect of 1.5 MeV Proton Irradiation on Superconductivity in FeSe0.5Te0.5 Thin Films

Contact Info

Product

Resources

About

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

Cited by 7 publications

References 27 publications

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

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

Enhancement of self-field critical current density by several-tens-MeV ion irradiation in YBa2Cu3O7 films prepared by fluorine-free metal-organic deposition

Effect of 1.5 MeV Proton Irradiation on Superconductivity in FeSe0.5Te0.5 Thin Films

Contact Info

Product

Resources

About

Enhancement of self-field critical current density by several-tens-MeV ion irradiation in YBa₂Cu₃O₇ films prepared by fluorine-free metal-organic deposition