Phase slips in superconducting weak links

Kimmel, Gregory J.; Glatz, Andreas; Aranson, Igor S.

doi:10.1103/physrevb.95.014518

Cited by 8 publications

(11 citation statements)

References 37 publications

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“…For example, in 1D superconducting nanowire, the phase of the order parameter fluctuates continuously and the phase fluctuations lead to vanishing order parameter momentarily when the phase slips by 2π and thus making the wire resistive at the phase slip centers (PSCs). This is known as PS phenomenon which can be initiated by applied current for a current carrying superconductor 9 .…”

Section: Introductionmentioning

confidence: 99%

A robust nitridation technique for fabrication of disordered superconducting TiN thin films featuring phase slip events

Yadav¹,

Kaushik²,

Saravanan³

et al. 2021

Sci Rep

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Disorder induced phase slip (PS) events appearing in the current voltage characteristics (IVCs) are reported for two-dimensional TiN thin films produced by a robust substrate mediated nitridation technique. Here, high temperature annealing of Ti/Si3N4 based metal/substrate assembly is the key to produce majority phase TiN accompanied by TiSi2 & elemental Si as minority phases. The method itself introduces different level of disorder intrinsically by tuning the amount of the non-superconducting minority phases that are controlled by annealing temperature (Ta) and the film thickness. The superconducting critical temperature (Tc) strongly depends on Ta and the maximum Tc obtained from the demonstrated technique is about 4.8 K for the thickness range ~ 12 nm and above. Besides, the dynamics of IVCs get modulated by the appearance of intermediated resistive steps for decreased Ta and the steps get more prominent for reduced thickness. Further, the deviation in the temperature dependent critical current (Ic) from the Ginzburg–Landau theoretical limit varies strongly with the thickness. Finally, the Tc, intermediate resistive steps in the IVCs and the depairing current are observed to alter in a similar fashion with Ta and the thickness indicating the robustness of the synthesis process to fabricate disordered nitride-based superconductor.

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Section: Introductionmentioning

confidence: 99%

A robust nitridation technique for fabrication of disordered superconducting TiN thin films featuring phase slip events

Yadav¹,

Kaushik²,

Saravanan³

et al. 2021

Sci Rep

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show abstract

“…Note, that the difference in braces behaves as π √ 2u/3 for small u, such that all terms ∝ u −2 under the derivative cancel and the complete expression is non-singular at u = 0. Therefore, in the limit of small u we keep the first two terms of the sum in (12) and expand the remaining sum to first order. This gives…”

Section: Iii1 Current Density Close To the Depairing Currentmentioning

confidence: 99%

Instabilities of the normal state in current-biased narrow superconducting strips

et al. 2020

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We study the current-voltage characteristic of narrow superconducting strips in the gapless regime near the critical temperature in the framework of the Ginzburg-Landau model. Our focus is on its instabilities occurring at high current biases. The latter are consequences of dynamical states with periodic phase-slip events in space and time. We analyze their structure and derive the value of the reentrance current at the onset of the instability of the normal state. It is expressed in terms of the kinetic coefficient of the time-dependent Ginzburg-Landau equation and calculated numerically.

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“…In the case of narrow strips with widths on the order of the superconducting coherence length, the critical current is mostly defined by its surface barrier and phase slips across the strip are important, 25,26 while for very wide strips, the critical current is dominated by its bulk pinning properties. This sets the quest for optimizing artificially manufactured disorder in geometrically restricted systems to take advantage of a potentially constructive interplay of bulk and surface pinning mechanisms.…”

Section: Introductionmentioning

confidence: 99%

Edge effect pinning in mesoscopic superconducting strips with non-uniform distribution of defects

Kimmel

Glatz

Vinokur

et al. 2019

Sci Rep

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Transport characteristics of nano-sized superconducting strips and bridges are determined by an intricate interplay of surface and bulk pinning. In the limiting case of a very narrow bridge, the critical current is mostly defined by its surface barrier, while in the opposite case of very wide strips it is dominated by its bulk pinning properties. Here we present a detailed study of the intermediate regime, where the critical current is determined, both, by randomly placed pinning centres and by the Bean-Livingston barrier at the edge of the superconducting strip in an external magnetic field. We use the time-dependent Ginzburg-Landau equations to describe the vortex dynamics and current distribution in the critical regime. Our studies reveal that while the bulk defects arrest vortex motion away from the edges, defects in their close vicinity promote vortex penetration, thus suppressing the critical current. We determine the spatial distribution of the defects optimizing the critical current and find that it is in general non-uniform and asymmetric: the barrier at the vortex-exit edge influence the critical current much stronger than the vortex-entrance edge. Furthermore, this optimized defect distribution has a more than 30% higher critical current density than a homogeneously disorder superconducting film.

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Phase slips in superconducting weak links

Cited by 8 publications

References 37 publications

A robust nitridation technique for fabrication of disordered superconducting TiN thin films featuring phase slip events

A robust nitridation technique for fabrication of disordered superconducting TiN thin films featuring phase slip events

Instabilities of the normal state in current-biased narrow superconducting strips

Edge effect pinning in mesoscopic superconducting strips with non-uniform distribution of defects

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