Optimal size of an insulating inclusion acting as a pinning center for magnetic flux in superconductors: calculation of pinning force

Takezawa, N.; Fukushima, Kimichika

doi:10.1016/s0921-4534(97)01574-8

Cited by 45 publications

(28 citation statements)

References 32 publications

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“…A more refined numerical calculation 27 solving the two dimensional GinzburgLandau equations for this problem gives the same temperature dependence of the pinning force. This pinning mechanism provides a pinning force F P = 7 × 10 −8 dyn at 0.98T C for our samples, similar to the previous case.…”

Section: A Pinning Mechanismsmentioning

confidence: 86%

Temperature dependence and mechanisms of vortex pinning by periodic arrays of Ni dots in Nb films

et al. 2000

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Pinning interactions between superconducting vortices in Nb and magnetic Ni dots were studied as a function of current and temperature to clarify the nature of pinning mechanisms. A strong current dependence is found for a square array of dots, with a temperature-dependent optimumcurrent for the observation of periodic pinning, that decreases with temperature as (1 − T /TC) 3/2 . This same temperature dependence is found for the critical current at the first matching field with a rectangular array of dots. The analysis of these results allows to narrow the possible pinning mechanisms to a combination of two: the interaction between the vortex and the magnetic moment of the dot and the proximity effect. Moreover, for the rectangular dot array, the temperature dependence of the crossover between the low field regime with a rectangular vortex lattice to the high field regime with a square configuration has been studied. It is found that the crossover field increases with decreasing temperature. This dependence indicates a change in the balance between elastic and pinning energies, associated with dynamical effects of the vortex lattice in the high field range.

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Section: A Pinning Mechanismsmentioning

confidence: 86%

Temperature dependence and mechanisms of vortex pinning by periodic arrays of Ni dots in Nb films

et al. 2000

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“…The calibration was performed on the CoKα line. A mean chemical composition was defined by averaging the 5 µm diameter of the electron beam 3 scanning over the area of 200x200 µm. The composition of local regions in Ce, Y, Ba, Cu, O was defined with a 15 µm diameter of the electron probe.…”

Section: Methodsmentioning

confidence: 99%

Effect of mesoscopic inhomogeneities on the critical current of bulk melt-textured YBCO

Uspenskaya

Naumenko

Емельченко

et al. 2003

Physica C: Superconductivity

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The downsizing 211-inclusions and an increase of their density leads to rise in mean critical current value in Y-based melt textured material. Very often 211-inclusion are spread in the material volume nonhomogeneous, with typical scale 50 -100 micrometer. Therefore it's difficult to find the real correlation between local critical current and the inclusions distribution. We performed a study of a local critical current using modified magneto-optic technique on a melt-textured YBaCuO ceramic, found the areas with constant current and studied the real structure of the material in the areas, inclusions distribution and their sizes, by scanning electron microscopy and X-ray microanalysis. The estimation of a pinning in these places, by taking into account the amount of inclusions and the length of their boundaries, and comparison with the value of local critical current reveals a strait correlation between the density of inclusions and the current but shows remarkable quantitative disagreement.

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“…However, other studies showed that the optimum size of pinning centers should be comparable to k rather than n [8]. The coherence length of Bi-2223 is around 2.9 nm, and the penetration depth is between 60 and 1000 nm [9].…”

Section: Introductionmentioning

confidence: 99%

Transport critical current density of (Bi1.6Pb0.4)Sr2Ca2Cu3O10/Ag superconductor tapes with addition of nanosized CoFe2O4

Hafiz

Abd‐Shukor

2015

Appl. Phys. A

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The effect of nanosized CoFe 2 O 4 (60 nm) addition on the transport critical current density, J c , of (Bi 1.6 Pb 0.4 )Sr 2 Ca 2 Cu 3 O 10 (CoFe 2 O 4 ) x (x = 0-0.05 wt%) superconductor prepared by the co-precipitation method was investigated. The optimal J c (measured using the fourpoint probe method) was observed in the x = 0.01 wt% pellets. Using this optimal wt%, Ag-sheathed (Bi 1.6 Pb 0.4 )-Sr 2 Ca 2 Cu3O 10 (CoFe 2 O 4 ) 0.01 superconductor tapes were fabricated using the powder-in-tube method. The tapes were sintered for 50 and 100 h at 845°C. The phase and microstructure of the samples were determined using the powder X-ray diffraction method and scanning electron microscopy, respectively. The temperature dependence of J c for the tapes in various applied magnetic fields was also measured.

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Optimal size of an insulating inclusion acting as a pinning center for magnetic flux in superconductors: calculation of pinning force

Cited by 45 publications

References 32 publications

Temperature dependence and mechanisms of vortex pinning by periodic arrays of Ni dots in Nb films

Temperature dependence and mechanisms of vortex pinning by periodic arrays of Ni dots in Nb films

Effect of mesoscopic inhomogeneities on the critical current of bulk melt-textured YBCO

Transport critical current density of (Bi1.6Pb0.4)Sr2Ca2Cu3O10/Ag superconductor tapes with addition of nanosized CoFe2O4

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