Recent Achievements on the Physics of High-T C Superconductor Josephson Junctions: Background, Perspectives and Inspiration

Tafuri, F.; Massarotti, Davide; Galletti, Luca; Stornaiuolo, Daniela; Montemurro, Domenico; Longobardi, L.; Lucignano, P.; Rotoli, G.; Pepe, Giovanni Piero; Tagliacozzo, A.; Lombardi, Floriana

doi:10.1007/s10948-012-1773-0

Cited by 47 publications

(29 citation statements)

References 223 publications

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“…5(a) and (b), the dependences 0 ( ) Hence, nonmonotonic dependences should be better observed for thick enough insulator interlayers, for which tunnel directionality that ASJ resonant states do not play any significant role in the experiments discussed abovlity is stronger. It seems that ASJ resonant states do not play any significant role in the experiments discussed above due to the surface roughness [25,27,[41][42][43], which eliminates the corresponding energy levels predicted for Josephson junctions made of d-wave superconductors [5,7,8,20,28,29]. Another, mandatory, effect predicted in the framework of the ASJ paradigm-namely, the steep increase of ( ) c I T at 0 T → -also seems not to be actual for experiments with cuprate tunnel junctions.…”

Section: ′ γ γ θmentioning

confidence: 94%

“…In particular, when the orientation angles of the superconducting order parameter lobes are = /4 γ π and = /4 ′ γ ±π (hereafter, primed quantities are associated with the right hand side electrode), thermal depopulation of the upper ASJ surface levels leads to the enhancement of the Josephson current J I at low temperatures, which can be considered as the smoking gun of surface states [25][26][27]. A detailed account of the Josephson current flowing between d-wave superconductors and a comprensive lists of further references can be found in the literature [5,7,8,20,28,29].…”

Section: Introductionmentioning

confidence: 99%

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Anomalous temperature dependence of the stationary Josephson tunnel current in junctions between d-wave superconductors

Gabovich

Войтенко

2014

Low Temperature Physics

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Stationary Josephson current I c between d-wave superconductors was calculated for superconductorinsulator-superconductor structures with various rotations of crystals relatively to each other and the junction plane. The directionality of tunneling was taken into account. It was demonstrated that the temperature, T, dependences of I c can become nonmonotonic for certain electrode orientations due to the T-dependent ratio between the contributions of positive and negative I c components. This model gives an explanation to the effect observed in junctions involving cuprates and is an alternative to the well-known scenario that makes allowance for Andreev-Saint-James zero-energy levels.

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Section: ′ γ γ θmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Anomalous temperature dependence of the stationary Josephson tunnel current in junctions between d-wave superconductors

Gabovich

Войтенко

2014

Low Temperature Physics

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“…Common to most of junctions with hysteretic I-V curves discussed up to now, including the latest ferromagnetic junctions, is the discrepancy between the expected latching voltage value (V sw ) after the switch of the critical current from the superconducting state and the expected value V g . Unconventional behaviors of HTS JJs have been widely discussed in literature (most references can be found in the reviews [18,[22][23][24]) and cover a large variety of issues, which are beyond the scope of this manuscript. We confine our interest to specific aspects related to I-V curves.…”

Section: I-v Curves Of Unconventional Junctionsmentioning

confidence: 99%

What happens in Josephson junctions at high critical current densities

Massarotti¹,

Stornaiuolo²,

Lucignano³

et al. 2017

Low Temperature Physics

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The impressive advances in material science and nanotechnology are more and more promoting the use of exotic barriers and/or superconductors, thus paving the way to new families of Josephson junctions. Semiconducting, ferromagnetic, topological insulator and graphene barriers are leading to unconventional and anomalous aspects of the Josephson coupling, which might be useful to respond to some issues on key problems of solid state physics. However, the complexity of the layout and of the competing physical processes occurring in the junctions is posing novel questions on the interpretation of their phenomenology. We classify some significant behaviors of hybrid and unconventional junctions in terms of their first imprinting, i.e. current-voltage curves, and propose a phenomenological approach to describe some features of junctions characterized by relatively high critical current densities J c . Accurate arguments on the distribution of switching currents will provide quantitative criteria to understand physical processes occurring in high-J c junctions. These notions are universal and apply to all kinds of junctions.

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“…The use of HTS could bring several advantages, and more importantly higher operational temperatures fundamental for practical applications of superconducting field effect transistors [8][9][10][11].…”

Section: Introductionmentioning

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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Recent Achievements on the Physics of High-T C Superconductor Josephson Junctions: Background, Perspectives and Inspiration

Cited by 47 publications

References 223 publications

Anomalous temperature dependence of the stationary Josephson tunnel current in junctions between d-wave superconductors

Anomalous temperature dependence of the stationary Josephson tunnel current in junctions between d-wave superconductors

What happens in Josephson junctions at high critical current densities

Josephson effect through YBa2Cu3O7−δ /Au-encapsulated nanogaps

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