Simultaneous inductive determination of grain and intergrain critical current densities of YBa2Cu3O7−x coated conductors

Palau, Anna; Puig, T.; Obradors, X.; Pardo, Enric; Navau, Carles; Sanchez, Alvaro; Usoskin, A.; Freyhardt, H.C.; Fernández, Lidia Rodríguez; Holzäpfel, B.; Feenstra, R.

doi:10.1063/1.1639940

Cited by 74 publications

(75 citation statements)

References 17 publications

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“…4 when |H a | is decreased. As mentioned already, our system can be regarded as granular, like a coated-conductor 42,43 . In the simplest view, the grains correspond to the graphene area overlapping with the Al pads, and the grain boundary, across which the dissipative/non-dissipative Josephson supercurrent flows, corresponds to the bare graphene weak link.…”

Section: Collapse Of the Josephson Supercurrent Close To Zero Magnmentioning

confidence: 99%

Incipient Berezinskii-Kosterlitz-Thouless transition in two-dimensional coplanar Josephson junctions

et al. 2016

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Superconducting hybrid junctions are revealing a variety of novel effects. Some of them are due to the special layout of these devices, which often use a coplanar configuration with relatively large barrier channels and the possibility of hosting Pearl vortices. A Josephson junction with a quasi ideal two-dimensional barrier has been realized by growing graphene on SiC with Al electrodes. Chemical Vapor Deposition offers centimeter size monolayer areas where it is possible to realize a comparative analysis of different devices with nominally the same barrier. In samples with a graphene gap below 400 nm, we have found evidence of Josephson coherence in presence of an incipient BerezinskiiKosterlitz-Thouless transition. When the magnetic field is cycled, a remarkable hysteretic collapse and revival of the Josephson supercurrent occurs. Similar hysteresis are found in granular systems and are usually justified within the Bean Critical State model (CSM). We show that the CSM, with appropriate account for the low dimensional geometry, can partly explain the odd features measured in these junctions.

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Section: Collapse Of the Josephson Supercurrent Close To Zero Magnmentioning

confidence: 99%

Incipient Berezinskii-Kosterlitz-Thouless transition in two-dimensional coplanar Josephson junctions

et al. 2016

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“…In this way they were able to determine the in-grain and grain boundary critical currents of an YBa 2 Cu 3 O 7−δ coated conductor sample. In a series of articles Palau and coworkers have extensively employed a similar technique, based on the identification of a peak in the M-H loop caused by material granularity, to study the in-grain and grain boundary contributions to the overall behaviour of IBAD and RABiTS based coated conductors [75,105]. In particular they have used magnetisation measurements to study the effect of the extent to which the superconducting layer adopts the granular structure of the substrate [106].…”

Section: Critical Currents From Magnetisation Measurementsmentioning

confidence: 99%

“…Magnetisation measurements have been developed to study separately IG and GB properties in coated conductors [75,76] but this method does not give satisfactory results with single boundaries. However, by lithographically patterning a current ring both Verebelyi [70] and Thompson [77] current to cross the grain boundary in two defined places.…”

Section: The In-field Properties Of Grain Boundariesmentioning

confidence: 99%

Importance of low-angle grain boundaries in YBa₂Cu₃O_7−δcoated conductors

Durrell¹,

Rutter²

2008

Supercond. Sci. Technol.

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Abstract. Over the past ten years the perception of grain boundaries in YBa 2 Cu 3 O 7−δ conductors has changed greatly. They are no longer a problem to be eliminated but an inevitable and potentially favourable part of the material. This change has arisen as a consequence of new manufacturing techniques which result in excellent grain alignment, reducing the spread of grain boundary misorientation angles. At the same time there is considerable recent evidence which indicates that the variation of properties of grain boundaries with mismatch angle is more complex than a simple exponential decrease in critical current. This is due to the fact that low-angle grain boundaries represent a qualitatively different system to high angle boundaries. The time is therefore right for a targetted review of research into low-angle YBa 2 Cu 3 O 7−δ grain boundaries. This article does not purport to be a comprehensive review of the physics of grain boundaries as found in YBa 2 Cu 3 O 7−δ in general; for a broader overview we would recommend that the reader consult the comprehensive review of Hilgenkamp and Mannhart (Rev. Mod. Phys., 74, 485, 2002). The purpose of this article is to review the origin and properties of the low-angle grain boundaries found in YBa 2 Cu 3 O 7−δ coated conductors both individually and as a collective system.

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“…This behavior has been found experimentally in cases in which the SC was granular and was associated to this granularity. 23,24 With the PM used in Fig. 3, unlike the cases of Fig.…”

Section: Tunability Of the Critical-current Density In Superconductormentioning

confidence: 99%

Tunability of the critical-current density in superconductor-ferromagnet hybrids

Del-Valle

Navau

Sanchez

et al. 2011

Applied Physics Letters

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Important modifications on the magnetization loops of the superconductor have been observed in superconductor-ferromagnet hybrids due to the effects of the ferromagnetic components, which can be used for tuning the superconductor critical-current density Jc to desirable values. Here, a model based on an energy minimization procedure is presented to analyze the complex interaction between the superconductor and the ferromagnets. We show how the geometry and orientation of the ferromagnets can be chosen for shifting the position of the peaks appearing in the magnetization to positive or negative applied fields, and, consequently, to tune Jc in superconductor-ferromagnet hybrids.

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Simultaneous inductive determination of grain and intergrain critical current densities of YBa2Cu3O7−x coated conductors

Cited by 74 publications

References 17 publications

Incipient Berezinskii-Kosterlitz-Thouless transition in two-dimensional coplanar Josephson junctions

Incipient Berezinskii-Kosterlitz-Thouless transition in two-dimensional coplanar Josephson junctions

Importance of low-angle grain boundaries in YBa₂Cu₃O_7−δcoated conductors

Tunability of the critical-current density in superconductor-ferromagnet hybrids

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Simultaneous inductive determination of grain and intergrain critical current densities of YBa2Cu3O7−x coated conductors

Cited by 74 publications

References 17 publications

Incipient Berezinskii-Kosterlitz-Thouless transition in two-dimensional coplanar Josephson junctions

Incipient Berezinskii-Kosterlitz-Thouless transition in two-dimensional coplanar Josephson junctions

Importance of low-angle grain boundaries in YBa2Cu3O7−δcoated conductors

Tunability of the critical-current density in superconductor-ferromagnet hybrids

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Importance of low-angle grain boundaries in YBa₂Cu₃O_7−δcoated conductors