Supercurrent transferring through<i>c</i>-axis cuprate Josephson junctions with thick normal-metal bridge

Yan, Xin; Ting, C. S.

doi:10.1088/0953-8984/21/3/035701

Cited by 2 publications

(3 citation statements)

References 24 publications

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“…The model of the SNS junction without the proximity effect [1][2][3] used in our analysis is rather simplistic, but its analysis is an important first step for investigation of more complicated cases when normal and superconducting layers have different Fermi energies and effective masses, or the normal layer of the SNS sandwich is replaced by other materials, e.g., ballistic graphene or ballistic nanotubes. These cases are studied experimentally and theoretically nowadays [4][5][6][7][8][9]. Although the extension of the model on various cases of interest for nowadays experiments is needed, one may expect that the conclusions about the π junction and the temperature dependence would survive this extension.…”

Section: Discussionmentioning

confidence: 99%

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Ballistic SNS sandwich as a Josephson junction

Sonin

2021

Phys. Rev. B

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The paper develops the theory of the ballistic SNS sandwich, in which the Josephson effect exists without the proximity effect. The analysis essentially revised the conclusions of previous works. The ballistic SNS sandwich is a π Josephson junction because its ground state corresponds not to zero Josephson phase but to the phases ±π. The analysis does not confirm previous predictions on strong suppression of the supercurrent at temperatures on the order or higher than the energy distance between Andreev levels. The disagreement is explained by violations of the charge conservation in the previous investigations. Other unusual properties of the ballistic SNS sandwich are also discussed: the absence of the Josephson plasma mode localized at the normal layer, the Meisner effect, and the Josephson vortex structure.

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Section: Discussionmentioning

confidence: 99%

“…Investigations of this model continues up to now [4]. The ballistic SNS Josephson junction was studied for unconventional pairing in high-T c superconductors [5]. There were theoretical and experimental investigations for other materials bridging two superconductors: graphene [6,7], topological insulator [8], and nanotubes [9].…”

Section: Introductionmentioning

confidence: 99%

Ballistic SNS sandwich as a Josephson junction

Sonin

2021

Phys. Rev. B

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“…To provide an enhanced length scale of the proximity effect, several models have been proposed 19 20 21 22 23 24 25 26 27 . One class of models postulate inhomogeneous barriers that contain superconducting islands embedded in a metallic matrix and forming a percolative network that can transmit supercurrent via Josephson coupling between the islands and also between the CuO 2 layers 19 20 21 22 .…”

Section: Discussionmentioning

confidence: 99%

The Meissner effect in a strongly underdoped cuprate above its critical temperature

et al. 2011

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The Meissner effect and associated perfect 'bulk' diamagnetism together with zero resistance and gap opening are characteristic features of the superconducting state. In the pseudogap state of cuprates, unusual diamagnetic signals and anomalous proximity effects have been detected, but a Meissner effect has never been observed. Here we probe the local diamagnetic response in the normal state of an underdoped La1.94Sr0.06CuO4 layer (Tc′≤5 K), which is brought into close contact with two nearly optimally doped La1.84Sr0.16CuO4 layers (Tc≈32 K). We show that the entire 'barrier' layer of thickness, much larger than the typical c axis coherence lengths of cuprates, exhibits a Meissner effect at temperatures above Tc′ but below Tc. The temperature dependence of the effective penetration depth and superfluid density in different layers indicates that superfluidity with long-range phase coherence is induced in the underdoped layer by the proximity to optimally doped layers, but this induced order is sensitive to thermal excitation.

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Supercurrent transferring throughc-axis cuprate Josephson junctions with thick normal-metal bridge

Cited by 2 publications

References 24 publications

Ballistic SNS sandwich as a Josephson junction

Ballistic SNS sandwich as a Josephson junction

The Meissner effect in a strongly underdoped cuprate above its critical temperature

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