Arresting of vortex motion in YBaCuO crystals with splay in columnar defects

Civale, L.; Krusin‐Elbaum, L.; Thompson, James R.; Wheeler, R.; Kirk, M. A.; Field, C.

doi:10.1016/0921-4534(94)91011-1

Cited by 6 publications

(3 citation statements)

References 6 publications

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“…Figure 11(a) shows the comparison [107,108] between the temperature dependencies of J (T ) (normalized to their values at 5 K) for two YBCO crystals. Both were irradiated to the same dose, B = 5 T, with the incident beam parallel to the c-axis, in one case using 0.58 GeV Sn and in the other 1.08 GeV Au.…”

Section: Splayed Defects Produced By Heavy Ionsmentioning

confidence: 99%

Vortex pinning and creep in high-temperature superconductors with columnar defects

Civale

1997

Supercond. Sci. Technol.

209

110

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Columnar defects introduced by irradiation with very energetic heavy ions are the most effective pinning centres for flux lines in high-temperature superconductors. This correlated disorder generates large increases in the critical current densities and expansion of the irreversible regime in and the various Bi- and Tl-based compounds. In single crystals and thin films, the pinning enhancement is strongly angular-dependent, and maximizes when the applied magnetic field is parallel to the amorphous latent tracks. In contrast, in the much more anisotropic Bi- and Tl- based materials this unidirectional anisotropy is very small due to the quasi two-dimensional character of the vortices. Some of the extensive experimental studies on this topic are reviewed. Measurements of the temperature, field and defect density dependence of the persistent currents and their time relaxation in YBCO are presented. The analysis of these results based on recent theoretical models permits the identification of various pinning and creep regimes. Studies in other compounds, including technologically relevant Bi-based tapes, are summarized. The influence of the angular dispersion (splay) of the tracks on vortex pinning and creep is discussed.

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Section: Splayed Defects Produced By Heavy Ionsmentioning

confidence: 99%

Vortex pinning and creep in high-temperature superconductors with columnar defects

Civale

1997

Supercond. Sci. Technol.

209

110

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“…Heavy ions (as Sn, Xe, Pb, etc.) of energies in the GeV range generate cylindrical tracks ('columnar defects'), which are highly effective [6] for flux pinning, since they can match the linear morphology and diameter of the vortex cores. However, it has been suggested [7] that 'splayed' columnar tracks (or tracks with angular spread in orientation) are even more effective than parallel columns.…”

Section: Conceptual Frameworkmentioning

confidence: 99%

Stability of supercurrents in a BiSrCaCuO (Bi-2212) high- Tcsuperconductor with artificially created defects

Ossandon

Thompson

1998

Superlattices and Microstructures

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“…This method, whether using continuous or broken columns, requires control of the geometry of the pinning centers. Such control is available if one utilizes the damage tracks of highenergy, high-Z ions as pinning centers [12]. However, this method requires high-energy particle accelerators, and is orders-of-magnitude too costly for practical applications.…”

Section: Introductionmentioning

confidence: 99%

Reduction of flux-creep in magnetized bulk HTS by use of permanent magnets

Parks

Weinstein

Davey

et al. 2016

Supercond. Sci. Technol.

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We report the effect of permanent magnet (PM) collars on the flux-creep rate of magnetized bulk HTS. The creep rates of single-grain, cylindrical samples are measured with attached collars activated to various fields, BPM, in the range 0 ≤ BPM ≤ BPM,max, where BPM,max is the fully saturated field of the PM. As BPM varies, the creep rate of the HTS is found to maintain its well-known form—a constant fractional loss λ, of original residual field, per decade of time. However, the magnitude of λ decreases as BPM increases. The decrease in λ is found to be linearly dependent on increasing BPM. The collar field for which flux-creep extrapolates to zero is found to be comparable to the maximum trappable field of the HTS bulk, BT,max. The properties of the dependence of λ on the HTS peak field, BT,max, the PM field, BPM, and the creep rate λ0 with BPM = 0 permit the reduced creep rate in these experiments to be predicted by a universal equation.

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Arresting of vortex motion in YBaCuO crystals with splay in columnar defects

Cited by 6 publications

References 6 publications

Vortex pinning and creep in high-temperature superconductors with columnar defects

Vortex pinning and creep in high-temperature superconductors with columnar defects

Stability of supercurrents in a BiSrCaCuO (Bi-2212) high- Tcsuperconductor with artificially created defects

Reduction of flux-creep in magnetized bulk HTS by use of permanent magnets

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