Interfacial control of vortex-limited critical current in type-II superconductor films

Hope, Marius K.; Amundsen, Morten; Suri, Dhavala; Moodera, Jagadeesh S.; Kamra, Akashdeep

doi:10.1103/physrevb.104.184512

Cited by 12 publications

(9 citation statements)

References 80 publications

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“…We attribute our observations to the critical current being determined by the vortex flow. Our results confirm that the SDE is caused by unequal vortex barriers on the two side surfaces of the film 27,29 .…”

supporting

confidence: 83%

“…While a majority of the theoretical work has focused on the critical depairing mechanism, the critical current in type II superconductors is often determined by the vortex surface barriers [24][25][26][27] . The supercurrent tries to pull vortices nucleated on one edge towards the other side, where they can be annihilated.…”

mentioning

confidence: 99%

“…Following Ref. 27, we depict the forces on the relevant vortices near the left and the right edges in fig. 1 (d).…”

mentioning

confidence: 99%

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Non-reciprocity of vortex-limited critical current in conventional superconducting micro-bridges

Suri

Kamra

Meier

et al. 2022

Applied Physics Letters

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Non-reciprocity in the critical current has been observed in a variety of superconducting systems and has been called the superconducting diode effect. The origin underlying the effect depends on the symmetry breaking mechanisms at play. We investigate superconducting micro-bridges of NbN and also NbN/magnetic insulator (MI) hybrids. We observe a large diode efficiency of [Formula: see text]30% when an out-of-plane magnetic field as small as 25 mT is applied. In both NbN and NbN/MI hybrid, we find that the diode effect vanishes when the magnetic field is parallel to the sample plane. Our observations are consistent with the critical current being determined by the vortex surface barrier. Unequal barriers on the two edges of the superconductor strip result in the diode effect. Furthermore, the rectification is observed up to 10 K, which makes the device potential for diode based applications over a larger temperature range than before.

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supporting

confidence: 83%

mentioning

confidence: 99%

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Non-reciprocity of vortex-limited critical current in conventional superconducting micro-bridges

Suri

Kamra

Meier

et al. 2022

Applied Physics Letters

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“…As the field increases, an apparent weakening of the Meissner response results in a sublinear dependence of Ic on B. This could be due to penetration of vortices into the SC layer, which is estimated to happen around ~10 Oe for the films investigated here 11 . It is convenient to define 𝐵 𝑠 = 𝑗 𝑐 /𝑎 as the field scale where the critical current vanishes, assuming a linear extrapolation.…”

Section: Resultsmentioning

confidence: 77%

“…In such a FFLO-like phase, Cooper pairs gain a finite momentum 𝑞 0 , and the depairing effect for supercurrents flowing parallel and anti-parallel to 𝑞 0 is different, leading to a critical current nonreciprocity. On general grounds, interfaces cause inversion symmetry-breaking and Rashba SOC along the normal z direction thereby admitting a polar and odd-undertime-reversal vector 𝑇 along 𝑧 × ℎ, where ℎ is an applied magnetic field or an exchange field induced by an adjacent ferromagnet (FM) 11 . Thus, application of an in-plane magnetic field perpendicular to the current flow direction should activate 𝑇, resulting in peculiar superfluid condensate properties and a critical current nonreciprocity.…”

Section: Introductionmentioning

confidence: 99%

Ubiquitous Superconducting Diode Effect in Superconductor Thin Films

Hou

Nichele

Chi

et al. 2022

Preprint

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A superconductor exhibiting a polarity-dependent critical current is of fundamental as well as technological interest, because the superconducting (SC) layer can then admit a perfect dissipationless transmission along one direction while offering a large resistance along the opposite, leading to a phenomenon called SC diode effect or rectification. Here we demonstrate that SC diode effects are ubiquitous in superconductors and observable in a large variety of settings. Controllable via an out-of-plane magnetic field, we observe an extremely sensitive SC diode effect (type A) in superconducting vanadium or niobium stripes with symmetry breaking between their two edges. Nonreciprocity of critical current results from an out-of-plane field as small as 1 Oe, while the diode efficiency and polarity are manipulated via the strength and direction of the field. With the out-of-plane field carefully eliminated, an in-plane field also creates a sizeable asymmetry between critical currents (type B), regardless of whether this field is perpendicular or parallel to the current flow direction. Finally, we demonstrate nonreciprocal critical currents with a giant diode efficiency reaching 65% when the SC V film couples to a ferromagnetic EuS layer with in-plane magnetization orthogonal to current flow (type C) and a clear diode rectification is seen. This is also realized at zero applied field, in the remnant magnetic state of EuS. Our observations show the ubiquity of the superconducting diode effect, and pave the way for the development of versatile SC rectifiers employing simple structures using widely available materials.

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Larger in-plane upper critical field and superconducting diode effect observed in topological superconductor candidate InNbS2 nanoribbons

Zheng,

Wang,

Feng

et al. 2024

Nano Res.

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Interfacial control of vortex-limited critical current in type-II superconductor films

Cited by 12 publications

References 80 publications

Non-reciprocity of vortex-limited critical current in conventional superconducting micro-bridges

Non-reciprocity of vortex-limited critical current in conventional superconducting micro-bridges

Ubiquitous Superconducting Diode Effect in Superconductor Thin Films

Larger in-plane upper critical field and superconducting diode effect observed in topological superconductor candidate InNbS2 nanoribbons

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