Current Distribution in Thin Superconducting Films

Rhoderick, E. H.; Wilson, E. M.

doi:10.1038/1941167b0

Cited by 78 publications

(46 citation statements)

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“…Almost all the JRF(x,y) spatial profiles look like that shown in Fig. 5(b): a flux-free Meissner state having the two peak lines nearly localized at both strip edges [26,[43][44][45]. Exceptions are seen in a few areas marked by the arrows P1, P2 and P3 in Fig 5(a), where anomalously high photoresponse amplitude was seen.…”

Section: Spatial Limitationsmentioning

confidence: 79%

Microwave Current Imaging in Passive HTS Components by Low-Temperature Laser Scanning Microscopy (LTLSM)

2006

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distributed parameters in SC films as a function of the local critical current [27]. It is possible to manifest local resistive characterization of the SC transition [28][29][30], the spatial variations of magnetic and electromagnetic fields [31][32][33][34], and to carry out 2-D defectoscopy of structural and technological faults in operating SC devices and circuits [35][36][37]. In this work, we apply the LTLSM technique to analyze the redistribution of rf current flow in the vicinity of typical microdefects in YBCO films leading to anomalously high rf photoresponse, and possibly to nonlinear microwave behavior of SC devices. We have used the LTLSM technique for a spatially resolved investigation of the microwave transport properties, nonlinearities and material inhomogeneities in an operating coplanar waveguide YBa2Cu3O7-d (YBCO) microwave resonator on an LaAlO3 (LAO) substrate. The influence of twin-domain blocks, inplane rotated grains, and micro-cracks in the YBCO film on the nonuniform rf current distribution were measured with a micrometer-scale spatial resolution. The impact of the peaked edge currents and rf field penetration into weak links on the linear device performance were studied as well. The LTLSM capabilities and its future potential for non-destructive characterization of the microwave properties of superconducting circuits are discussed

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Section: Spatial Limitationsmentioning

confidence: 79%

Microwave Current Imaging in Passive HTS Components by Low-Temperature Laser Scanning Microscopy (LTLSM)

2006

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“…14,15 To remind the reader general results relevant to our problem we consider first the virgin state of an isolated superconductor sheet. 11,12,16,17 …”

Section: Current Redistribution In a Flux-free Strip By A Magnet mentioning

confidence: 99%

Overcritical states of a superconductor strip in a magnetic environment

2000

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A current-carrying superconducting strip partly penetrated by magnetic flux and surrounded by a bulk magnet of high permeability is considered. Two types of samples are studied: those with critical current controlled by an edge barrier dominating over the pinning, and those with high pinning-mediated critical current masking the edge barrier. It is shown for both cases that the current distribution in a central flux-free part of the strip is strongly affected by the actual shape of the magnetic surroundings. Explicit analytical solutions for the sheet current and self-field distributions are obtained which show that, depending on the geometry, the effect may suppress the total loss-free transport current of the strip or enhance it by orders of magnitude. The effect depends strongly on the shape of the magnet and its distance to the superconductor but only weakly on the magnetic permeability.

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“…When I < I c , current is quasi-homogeneously distributed through the tape cross-section and current density at the edges of the tape is higher [3,4]. Let us assume that λ L , the London penetration depth, temperature dependence is…”

Section: Current Density At Effective Penetration Depth Of the Tapementioning

confidence: 99%

Applicable Damage of High-T_cYbaCuO Superconducting Tapes by Current and Laser Pulses

et al. 2011

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Damage and irreversible damage of YBaCuO tapes with high density current after switching from superconducting to normal state are investigated. Quasi-homogeneous current distribution across the tape in superconducting state can cause perfect tape damage or irreversible damage when current is slightly above critical value. The model of the tape heating during the optically initiated switching from superconducting to normal state is proposed. Analysis of causes inducing damage shows necessity to consider 0.5T m damage criterion because of strong current influence on the damage processes. Possible damage mechanisms are described and crack tips motion simultaneously with switching from superconducting to normal state is considered. Application of optically illuminated YBaCuO tapes with nanosecond duration current pulses on the base of the described mechanisms is proposed.

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Current Distribution in Thin Superconducting Films

Cited by 78 publications

References 1 publication

Microwave Current Imaging in Passive HTS Components by Low-Temperature Laser Scanning Microscopy (LTLSM)

Microwave Current Imaging in Passive HTS Components by Low-Temperature Laser Scanning Microscopy (LTLSM)

Overcritical states of a superconductor strip in a magnetic environment

Applicable Damage of High-T_cYbaCuO Superconducting Tapes by Current and Laser Pulses

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Current Distribution in Thin Superconducting Films

Cited by 78 publications

References 1 publication

Microwave Current Imaging in Passive HTS Components by Low-Temperature Laser Scanning Microscopy (LTLSM)

Microwave Current Imaging in Passive HTS Components by Low-Temperature Laser Scanning Microscopy (LTLSM)

Overcritical states of a superconductor strip in a magnetic environment

Applicable Damage of High-TcYbaCuO Superconducting Tapes by Current and Laser Pulses

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Applicable Damage of High-T_cYbaCuO Superconducting Tapes by Current and Laser Pulses