Single and multiple superconducting weak-link systems

Blackburn, James A.; Schwartz, Brian B.; Baratoff, A.

doi:10.1007/bf00120866

Cited by 28 publications

(9 citation statements)

References 36 publications

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“…The inverse proximity effect in the superconducting banks of diffusive NS structures is also well studied. 27,32,42,45 The entropy and heat capacity in diffusive SNS junctions were discussed in Refs. 46 and 47, but neglecting the inverse proximity effect, which limits the validity of the results to long junctions only.…”

Section: Introductionmentioning

confidence: 99%

Quasiparticle entropy in superconductor/normal metal/superconductor proximity junctions in the diffusive limit

et al. 2017

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We discuss the quasiparticle entropy and heat capacity of a dirty superconductor-normal metalsuperconductor junction. In the case of short junctions, the inverse proximity effect extending in the superconducting banks plays a crucial role in determining the thermodynamic quantities. In this case, commonly used approximations can violate thermodynamic relations between supercurrent and quasiparticle entropy. We provide analytical and numerical results as a function of different geometrical parameters. Quantitative estimates for the heat capacity can be relevant for the design of caloritronic devices or radiation sensor applications.

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Section: Introductionmentioning

confidence: 99%

Quasiparticle entropy in superconductor/normal metal/superconductor proximity junctions in the diffusive limit

et al. 2017

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“…For microbridges, however, relevant CPRs are calculated on the basis of a simple model in [12,13] and [14]. It tums out that in general the CPR is nonsinusoidal.…”

mentioning

confidence: 99%

“…But because of the small effective contact area in point contacts, there is a very high critical current density which cannot be understood by (Josephson)-electron pair tunnelling. Therefore we will treat point contacts as microbridges Because of the high critical current density and the assumption that the length of the bridge is of the same order of magnitude as the thickness of the Nb-oxide layers, that means 1 > 2 ÇB' it results from the calculations in [12,13] that reentrant-behaviour of the CPR is to be expected for our contacts.…”

mentioning

confidence: 99%

Comparison of multiple flux quantum transition with the corresponding I-U-characteristic using Nb-point contacts

Voss

Hausen

1980

Rev. Phys. Appl. (Paris)

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For Superconductor-Superconductor (S-S) point contacts (Nb) a quantitative check is done whether the properties of flux quantum transition into a weakly connected superconducting loop can be predicted from the shape of the corresponding I-U-characteristic. The background is taken from the Resistively Shunted Junction (RSJ)-model using a modified sinusoidal Current-Phase-Relation (CPR). An experimental set-up was built to measure the I-U-characteristic and the flux penetration at the same point contact. The quantitative agreement between the predictions of the RSJ-model and the results of the experiment is surprisingly good

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“…In some respect, the studied Josephson junction resembles Josephson junctions based on a S'-S-S'system composed of two superconductors S and S' having D S′ ≫ D S and the same thicknesses [17,20,21]. A Josephson junction based on this quasi 1D system has a single-valued CPR, which approaches a sinusoidal shape with increasing temperature.…”

Section: Current-phase Relation Of the Sn-s-sn Josephson Junctionmentioning

confidence: 99%

A Josephson junction based on a highly disordered superconductor/low-resistivity normal metal bilayer

Marychev¹,

Vodolazov²

2020

Beilstein J. Nanotechnol.

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We calculate the current–phase relation (CPR) of a SN-S-SN Josephson junction based on a SN bilayer of variable thickness composed of a highly disordered superconductor (S) and a low-resistivity normal metal (N) with proximity-induced superconductivity. In such a junction, the N layer provides both a large concentration of phase in the weak link and good heat dissipation. We find that when the thickness of the S and the N layer and the length of the S constriction are about the superconducting coherence length the CPR is single-valued and can be close to a sinusoidal shape. The product I c R n can reach Δ(0)/2|e| (I c is the critical current of the junction, R n is its normal-state resistance, Δ(0) is the superconductor gap of a single S layer at zero temperature). Our calculations show, that the proper choice of the thickness of the N layer leads both to nonhysteretic current–voltage characteristics even at low temperatures and a relatively large product I c R n.

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Single and multiple superconducting weak-link systems

Cited by 28 publications

References 36 publications

Quasiparticle entropy in superconductor/normal metal/superconductor proximity junctions in the diffusive limit

Quasiparticle entropy in superconductor/normal metal/superconductor proximity junctions in the diffusive limit

Comparison of multiple flux quantum transition with the corresponding I-U-characteristic using Nb-point contacts

A Josephson junction based on a highly disordered superconductor/low-resistivity normal metal bilayer

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