Enhancement of the critical current across a YBCO thin-film grain boundary junction due to Abrikosov vortices

Müller, K.‐H.; Mitchell, E.E.; Herrmann, Jan; Lowe, Don; Andrikidis, C.; Thorley, A.; Foley, C. P.; Savvides, N.

doi:10.1016/s0921-4534(01)00911-x

Cited by 9 publications

(5 citation statements)

References 23 publications

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“…Figure 5 shows a typical temperature dependence (4.2 K < T < 77 K) of an I V C for step-edge junction in this study. The magnetic field dependence of I c for our step-edge junctions at 77 and 4.2 K has also been previously elucidated [30,31,41]. A Fraunhofer pattern for a step-edge junction at 4.2 K is shown in the inset to figure 5.…”

Section: Transport Measurementssupporting

confidence: 73%

YBCO step-edge junctions with highI_cR_n

Mitchell¹,

Foley

2010

Supercond. Sci. Technol.

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Step-edge junctions represent one type of grain boundary Josephson junction employed in high-temperature superconducting junction technology. To date, the majority of results published in the literature focus on [001]-tilt grain boundary junctions (GBJs) produced using bicrystal substrates. We investigate the step morphology and YBCO (yttrium barium copper oxide) film structure of YBCO-based step-edge junctions on MgO [001] substrates which structurally resemble [100]-tilt junctions. High-resolution electron microscopy reveals a clean GBJ interface of width ∼1 nm and a single junction at the top edge. The dependence of the transport properties on the MgO step-edge and junction morphology is examined at 4.2 K, to enable direct comparison with results for other junction studies such as [001]-tilt and [100]-tilt junctions and building on previously published 77 K data. MgO step-edge junctions show a slower reduction in critical current density with step angle compared with [001]-tilt junctions. For optimized step parameters, transport measurements revealed large critical current and normal resistance (I c R N ) products (∼3-5 mV), comparable with the best results obtained in other kinds of [100]-tilt GBJs in YBCO at 4.2 K. Junction-based devices such as SQUIDs (superconducting quantum interference devices) and THz imagers show excellent performance when MgO-based step-edge junctions are used.

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Section: Transport Measurementssupporting

confidence: 73%

YBCO step-edge junctions with highI_cR_n

Mitchell¹,

Foley

2010

Supercond. Sci. Technol.

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“…The region a c 6 |x| 6 a is filled with pinned vortices and the current density is equal to the critical current density j c , the highest possible current density in the sample. The surface critical current density, j c (H,T) (A/m), has the following phenomenological form [12][13][14][15]:…”

Section: Surface Impedance As a Function Of The Complex Conductivity mentioning

confidence: 99%

Self-consistent numerical method to study nonlinearity in high-Tc superconductors using complex conductivity

Ghamlouche

Benkraouda

2007

Physica C: Superconductivity

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“…Indeed, if vortices were trapped in the junction area, they would sum their stray field to the external one, giving a peak at negative values. 3,[6][7][8]29 In Ref. 29, the hysteretic I Cj ͑H a ͒ behavior was accounted for by a model, based on the Ginsburg-Landau equation, which considers the transverse geometry of the thin film junction and the contribution of both Meissner currents and Abrikosov vortices ͑with and without pinning͒ close to the grain boundary.…”

Section: Fig 5 ͑A͒mentioning

confidence: 99%

“…3,[6][7][8]29 In Ref. 29, the hysteretic I Cj ͑H a ͒ behavior was accounted for by a model, based on the Ginsburg-Landau equation, which considers the transverse geometry of the thin film junction and the contribution of both Meissner currents and Abrikosov vortices ͑with and without pinning͒ close to the grain boundary. This model relates the hysteretic I Cj ͑H a ͒ behavior to the hysteretic nature of the contribution of Abrikosov vortex to supercurrents.…”

Section: Fig 5 ͑A͒mentioning

confidence: 99%

Stray-field effects in submicronYBa2Cu3O7−xbicrystal grain boundary junctions

et al. 2006

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We have investigated the magnetic field dependence of the critical current in submicron YBa 2 Cu 3 O 7−x ͓001͔ tilt bicrystal grain boundary junctions. The good homogeneity of submicron grain boundary barrier interfaces, together with the large magnetic field needed to modulate the Josephson current, allow to observe several features not observed in micron size junctions, like a nonconstant modulation period, strongly dependent on the maximum applied magnetic field. Experimental results are well accounted for by a theoretical model taking into account the magnetization of the nearby electrode, and the strong interaction of its stray field with the junction interface. The analysis of the nature of this interaction and the influence of the device geometry are also relevant for potential applications of high critical temperature LSI devices.

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Enhancement of the critical current across a YBCO thin-film grain boundary junction due to Abrikosov vortices

Cited by 9 publications

References 23 publications

YBCO step-edge junctions with highI_cR_n

YBCO step-edge junctions with highI_cR_n

Self-consistent numerical method to study nonlinearity in high-Tc superconductors using complex conductivity

Stray-field effects in submicronYBa2Cu3O7−xbicrystal grain boundary junctions

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Enhancement of the critical current across a YBCO thin-film grain boundary junction due to Abrikosov vortices

Cited by 9 publications

References 23 publications

YBCO step-edge junctions with highIcRn

YBCO step-edge junctions with highIcRn

Self-consistent numerical method to study nonlinearity in high-Tc superconductors using complex conductivity

Stray-field effects in submicronYBa2Cu3O7−xbicrystal grain boundary junctions

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YBCO step-edge junctions with highI_cR_n

YBCO step-edge junctions with highI_cR_n