Magnetization and transport currents in thin superconducting films

Zeldov, E.; Clem, John R.; McElfresh, M.; Darwin, M.

doi:10.1103/physrevb.49.9802

Cited by 606 publications

(536 citation statements)

References 27 publications

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“…The images reveal a globally homogeneous penetration of the magnetic flux into the sample obeying the Bean critical state. 18,19 We obtain the local value of the critical current density from j c ∼ 6 ∂B ⊥ /∂x (the factor 6 is estimated from Ref. 14 for a crystal aspect-ratio of 0.1).…”

Section: Resultsmentioning

confidence: 99%

Strong pinning and vortex energy distributions in single-crystalline Ba(Fe1−xCox)2

et al. 2011

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The interrelation between heterogeneity and flux pinning is studied in Ba(Fe1−xCox)2As2 single crystals with widely varying Co-content x. Magnetic Bitter decoration of the superconducting vortex ensemble in crystals with x = 0.075 and x = 0.1 reveal highly disordered vortex structures. The width of the Meissner belt observed at the edges of the crystals, and above the surface steps formed by cleaving, as well as the width of the intervortex distance distribution, indicate that the observed vortex ensemble is established at a temperature just below the critical temperature Tc. The vortex interaction energy and pinning force distributions extracted from the images strongly suggest that the vortex lattice disorder is attributable to strong pinning due to spatial fluctuations of Tc and of the superfluid density. Correlating the results with the critical current density yields a typical length scale of the relevant disorder of 40 -60 nm.

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Section: Resultsmentioning

confidence: 99%

Strong pinning and vortex energy distributions in single-crystalline Ba(Fe1−xCox)2

et al. 2011

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“…Quantitatively, the situation can be assessed that the self field of the sample is completely screened (B z ϭ0 in the sample͒. The current distribution is then given by 16 J͑x ͒ϭ…”

Section: Discussionmentioning

confidence: 99%

Depairing currents in the superconductor/ferromagnet proximity system Nb/Fe

et al. 2001

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We have investigated the behavior of the depairing current J dp in ferromagnet/superconductor/ferromagnet (F/S/F) trilayers as function of the thickness d s of the superconducting layers. Theoretically, J dp depends on the superconducting order parameter or the pair-density function, which is not homogeneous across the film due to the proximity effect. We use a proximity-effect model with two parameters ͑proximity strength and interface transparency͒, which can also describe the dependence of the superconducting transition temperature T c on d s . We compare the computations with the experimentally determined zero-field critical current J c0 of small strips ͑typically 5-m wide͒ of Fe/Nb/Fe trilayers with varying thickness d Nb of the Nb layer. Near T c the temperature dependence J c0 (T) is in good agreement with the expected behavior, which allows extrapolation to Tϭ0. Both the absolute values of J c0 (0) and the dependence on d Nb agree with the expectations for the depairing current. We conclude that J dp is correctly determined, notwithstanding the fact that the strip width is larger than both the superconducting penetration depth and the superconducting coherence length, and that J dp (d s ) is correctly described by the model.

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“…A more accurate approach would use an elliptic 3D shape to model the flux front [40]. However, with our thin sample geometry, we assumed a simplified 2D current distribution that is homogeneous throughout the thickness (see Fig.14 [38][39]. It is expected that in a thin YBCO plate the current at the normal flux front can slightly increase due to the bending of vortices and enhanced pinning on the CuO planes [40].…”

Section: Comparison Of Normal Flux Patterns With and Without In-planementioning

confidence: 99%

“…We assumed a constant critical current J c fit for the penetrating B ⊥ and a constant edge current J E within a thin layer along the sample boundaries. In the flux-free center zone, the current was approximated by the 1D Meissner solution for a long superconducting strip [38][39] with varying maximum current J M . A more accurate approach would use an elliptic 3D shape to model the flux front [40].…”

Section: Comparison Of Normal Flux Patterns With and Without In-planementioning

confidence: 99%

Flux cutting in high-Tcsuperconductors

et al. 2015

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We performed magneto-optical study of flux distributions in a YBCO crystal under various applied crossed-field orientations to elucidate the complex nature of magnetic flux cutting in superconductors. Our study reveals unusual vortex patterns induced by the interplay between flux-cutting and vortex pinning. We observe strong flux penetration anisotropy of the normal flux B ⊥ in the presence of an in-plane field H || and associate the modified flux dynamics with staircase structure of tilted vortices in YBCO and the flux-cutting process.We demonstrate that flux-cutting can effectively delay vortex entry in the direction transverse to H || . Finally, we elucidate details of the vortex-cutting and reconnection process using time-dependent Ginzburg-Landau simulations.

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Magnetization and transport currents in thin superconducting films

Cited by 606 publications

References 27 publications

Strong pinning and vortex energy distributions in single-crystalline Ba(Fe1−xCox)2

Strong pinning and vortex energy distributions in single-crystalline Ba(Fe1−xCox)2

Depairing currents in the superconductor/ferromagnet proximity system Nb/Fe

Flux cutting in high-Tcsuperconductors

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