Edge-shape barrier irreversibility and decomposition of vortices in Bi2Sr2CaCu2O8

Indenbom, M. V.; D’Anna, G.; André, M.-O.; Kabanov, V. V.; Benoît, W.

doi:10.1016/0921-4534(94)91348-x

Cited by 25 publications

(6 citation statements)

References 20 publications

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“…An additional major difficulty in determining H c1 and moreover in measuring small variations in H c1 are the energy barriers against vortex penetration and bulk pinning, which may significantly increase H p and hinder the system from reaching thermodynamic equilibrium. A major contribution to the hysteresis comes from geometrical [1][2][3] and surface 4,5 barriers. The geometrical barrier arises from the competition between the inward Lorentz force due to the Meissner shielding currents and the outward force due to increase in vortex line energy.…”

Section: Introductionmentioning

confidence: 99%

Influence of spatial variations in the lower critical field on the equilibrium field penetration into superconductors

et al. 2008

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International audienceThe thermodynamic lower critical field Hc1 in Bi2Sr2CaCu2O8+y crystals, in the presence of columnar defects, was determined using magneto-optical measurements combined with the shaking technique. We observe a downward shift in Hc1 due to columnar defects. Using partially irradiated samples, we show that small local variations in Hc1 dramatically affect the way the field penetrates into superconductors. We present a theoretical model which provides a quantitative fit to the experimental results and explains how the influence of small sample inhomogeneities is enhanced by geometrical effects and leads to significant variations in the local-field distribution and penetration

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Section: Introductionmentioning

confidence: 99%

Influence of spatial variations in the lower critical field on the equilibrium field penetration into superconductors

et al. 2008

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“…The effect of SB on the magnetic properties has been extensively studied theoretically [1][2][3][4]. In recent years numerous studies have shown that SB dominate the magnetization behavior in clean crystals of high temperature superconductor (HTSC), in particular at elevated temperatures [5][6][7][8][9][10]. Since bulk pinning is strongly reduced by thermal fluctuations, the relative importance of the SB is expected to grow with temperature [11].…”

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confidence: 99%

Surface barrier dominated transport inNbSe2

et al. 1998

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Transport current distribution in clean 2H-NbSe 2 crystals is studied by measuring the self-induced magnetic field across the sample. Below T c most of the current flows at the edges of the crystals due to strong surface barriers, which are found to dominate the transport properties and the resistive transition.The measured critical current is determined by the critical current for vortex penetration through the surface barrier rather than by bulk pinning.

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“…The surface barriers for high enough fields are determined mainly by the geometry of superconducting crystals. The most effective geometrical barriers exist for the samples with rectangular cross section [20][21][22][23]. In this case there exists no force from the vortex tension, which for the ellipsoidal case exactly compensates the Lorentz force from the shielding currents driving the vortices to interior of a sample.…”

Section: Results and Discussion: The Bisco-systemmentioning

confidence: 99%

Scanning ESR-microprobe studies of the flux distribution in type-II superconductors

1998

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A new method for the study of the distribution of the magnetic field in a superconducting sample is developed. The field profile in the interior of the sample is mapped from the data on the spin probe ESR-signal shift measured at different points over the plane surface. The main attention is focused to the penetration of a perpendicular magnetic field into single crystal strips. The penetration of magnetic flux into an YBCO crystal is shown to be delayed and this gives rise to formation of the steep fronts in the profile of the field near the center of the strip. The profile observed differs considerably from the well-known Bean picture. It is highly dependent on the magnetic history. For the case of a Bi:2212 rectangular crystal, the crossover of the magnetic field profile from a dome shape, typical for a geometrical barrier (T > 30 K), to a bulk pinning picture (T < 25 K) was observed upon variation of temperature. The analysis of the field distribution made it possible to determine the temperature dependence of the lower critical field.

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Edge-shape barrier irreversibility and decomposition of vortices in Bi2Sr2CaCu2O8

Cited by 25 publications

References 20 publications

Influence of spatial variations in the lower critical field on the equilibrium field penetration into superconductors

Influence of spatial variations in the lower critical field on the equilibrium field penetration into superconductors

Surface barrier dominated transport inNbSe2

Scanning ESR-microprobe studies of the flux distribution in type-II superconductors

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