Evidence for Nonlocal Electrodynamics in Planar Josephson Junctions

Boris, Andrey A.; Rydh, Andreas; Golod, Taras; Motzkau, Holger; Клушин, А.М.; Krasnov, Vladimir M.

doi:10.1103/physrevlett.111.117002

Cited by 42 publications

(46 citation statements)

References 28 publications

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“…All previous theoretical studies considered a similar case [41,42,[44][45][46]. We note that junctions studied here and earlier [17,43] have intermediate electrode thickness d ∼ λ [53] and their sizes L x ∼ 5−6 µm are significantly larger that λ * ∼ 100 − 300 nm. Therefore, stray fields can not be neglected in the experiment.…”

Section: Theoretical Analysissupporting

confidence: 50%

“…For planar junctions, studied below, d e f f is determined by the size L x of junction electrodes. [27,[53][54][55][56] In the presence of AV the Josephson phase difference is a superposition of contributions from the Meissner state, ϕ M (H), and vortex-induced phase shift at zero field, ϕ V (0):…”

Section: Theoretical Analysismentioning

confidence: 99%

“…Magnetic field is applied perpendicular to the film. More details about fabrication and characterization of such planar junctions can be found in Refs [17,27,43,53,60,61]…”

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confidence: 99%

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Two mechanisms of Josephson phase shift generation by an Abrikosov vortex

2019

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Abrikosov vortex contains magnetic field and circulating currents that decay at a short range λ ∼ 100 nm. However, the vortex can induce a long range Josephson phase shift at distances r ∼ µm λ. The mechanism of this puzzling phenomenon is not clearly understood. Here we present a systematic study of vortex-induced phase shift in planar Josephson junctions. We make two key observations: (i) The cutoff effect: although vortexinduce phase shift is a long-range phenomenon, it is terminated by the junction and does not persists beyond it. (ii) A crossover from linear to superlinear dependence of the phase shift on the vortex polar angle occurs upon approaching of the vortex to the junction. The crossover occurs at a distance comparable with the penetration depth. This, together with theoretical and numerical analysis of the problem, allows unambiguous identification of two distinct and independent mechanisms. The short range mechanism is due to circulating vortex currents inside superconducting electrodes without involvement of magnetic field. The long range mechanism is due to stray magnetic fields outside electrodes without circulating vortex currents. We argue that understanding of controlling parameters of vortex-induced Josephson phase shift can be used for development of compact and fast electronic devices with low dissipation power.

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Section: Theoretical Analysissupporting

confidence: 50%

Section: Theoretical Analysismentioning

confidence: 99%

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Two mechanisms of Josephson phase shift generation by an Abrikosov vortex

2019

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“…They differ significantly from conventional overlap (sandwich-type) junctions. In particular, electrodynamics of planar junctions is nonlocal when electrode thickness is less than the London penetration depth [24][25][26][27]. When magnetic field is applied perpendicular to the film plane, Meissner screening leads to spreading of magnetic field lines along the surface, as sketched in Fig.…”

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confidence: 99%

Planar Superconductor-Ferromagnet-Superconductor Josephson Junctions as Scanning-Probe Sensors

2019

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We propose a novel type of magnetic scanning probe sensor, based on a single planar Josephson junction with a magnetic barrier. The planar geometry together with high magnetic permeability of the barrier helps to focus flux in the junction and thus enhance the sensitivity of the sensor. As a result, it may outperform equally sized SQUID both in terms of the magnetic field sensitivity and the spatial resolution in one scanning direction. We fabricate and analyze experimentally sensor prototypes with a superparamagnetic CuNi and a ferromagnetic Ni barrier. We demonstrate that the planar geometry allows easy miniaturization to nm-scale, facilitates an effective utilization of the self-field phenomenon for amplification of sensitivity and a simple implementation of a control line for feed-back operation in a broad dynamic range.

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“…This phenomenology is often observed in magnetically long junctions when the Josephson penetration depth λ J is much shorter than the width w [19]. For our specific planar type junctions, the Josephson penetration depth has to be calculated by considering nonlocal electrodynamics [20]. The nonlocal l J and local λ J [21] Josephson penetration depths are related by the expression…”

Section: Transport Measurements and Discussionmentioning

confidence: 99%

Josephson effect through YBa2Cu3O7−δ /Au-encapsulated nanogaps

Baghdadi

Abay

Golubev³

et al. 2017

Phys. Rev. B

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We successfully fabricated and studied planar superconductor-normal-superconductor (SNS) Josephson junctions made of YBa 2 Cu 3 O 7−δ (YBCO) high-T C superconductor (S) and Au normal metal (N). The crucial step in fabrication was done by using a Pt/Au bilayer encapsulation of the patterned YBCO nanogap. This procedure preserves the YBCO nanogap from the degradation due to the contact with resists, water, and chemicals involved in further processing for hybrid devices. The junctions exhibit Fraunhofer-like modulation patterns and Shapiro steps when they are irradiated by a rf field. Furthermore, we analyzed the I C (T ) characteristics of our hybrid junctions employing a SINI S (superconductor-insulator-normal conductor-insulator-superconductor) model.

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Evidence for Nonlocal Electrodynamics in Planar Josephson Junctions

Cited by 42 publications

References 28 publications

Two mechanisms of Josephson phase shift generation by an Abrikosov vortex

Two mechanisms of Josephson phase shift generation by an Abrikosov vortex

Planar Superconductor-Ferromagnet-Superconductor Josephson Junctions as Scanning-Probe Sensors

Josephson effect through YBa2Cu3O7−δ /Au-encapsulated nanogaps

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