Improving the IcRn product and the reproducibility of high Tc Josephson junctions made by ion irradiation

Sirena, M.; Fabrèges, X.; Bergeal, N.; Lesueur, J.; Faini, G.; Bernard, Rozenn; Briático, J.

doi:10.1063/1.2828133

Cited by 5 publications

(4 citation statements)

References 14 publications

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“…8.23, for details see the review of Merkle et al (1999). Further improvement of the I c R N product was obtained by Sirena et al (2007) by increasing the ion energy. The metal electrodes (mainly Au) are included in devices as well as passivation and protection layers.…”

Section: Preparation and Performance Of Artificial Barrier Junctionsmentioning

confidence: 99%

High-T c Josephson junctions

Seidel

2011

High-Temperature Superconductors

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Section: Preparation and Performance Of Artificial Barrier Junctionsmentioning

confidence: 99%

High-T c Josephson junctions

Seidel

2011

High-Temperature Superconductors

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“…Although the ion-irradiated Josephson junction fabricated for this study has a characteristic frequency well below any reasonable estimate of the YBa 2 Cu 3 O 7 gap frequency, several developments can be made to optimize the I c R n product [18,19]. In particular, a higher fluence of irradiation combined with an annealing of the sample should lead to a qualitative improvement [20,21].…”

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confidence: 94%

Toward terahertz heterodyne detection with superconducting Josephson nano-junctions

Luo,

Wolf,

Wang

et al. 2012

Preprint

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In this letter, we present the study of the high-frequency mixing properties of ion irradiated YBa2Cu3O7 Josephson nano-junctions. The frequency range, spanning above and below the characteristic frequencies fc of the junctions, permits a clear observation of the transition between two mixing regimes. The experimental conversion gain was found to be in good agreement with the prediction of the three ports model. Finally, we discuss the potential of the junctions to build a Josephson mixer operating in the terahertz frequency range.The terahertz (THz) region of the electromagnetic spectrum [0.3-10THz] has, so far, not been exploited fully due to the lack of suitable sources and detectors [1]. Indeed, THz frequency lies between the frequency range of traditional electronics and photonics where the existing technology cannot be simply extended. Low temperature superconducting-insulating-superconducting Niobium tunnel junctions are currently used as frequency mixing element in heterodyne receivers [2], providing extremely low noise and high sensitivity [3]. However, they are intrinsically limited in frequency by the energy gap of Nb (∼800 GHz ) and operate only at low temperature (4.2K).An alternative to these devices consists of using high-temperature superconducting (HTS) receivers based on Josephson Junctions mixers or hot-electron bolometers. In addition to the obvious advantage of a much higher operating temperature, the investigation of HTS mixers is motivated by the possibility of approaching quantumlimited noise performance at frequencies higher than what is possible with conventional Nb devices [4,5]. Hence, it is important to develop HTS devices and related heterodyne mixer technology for applications in the THz range.However, despite a few promising realizations mainly based on grain-boundary or ramp edge junctions [6-8], the development was slowed down by the difficulty to build a junction technology sufficiently reliable to fabricate complex

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“…Both S/N/S weak-links [7,8] and S/I/S tunnel junctions [11] can be defined in this way. Besides yielding very reproducible Josephson characteristics [12], the key advantage of this approach is that the planar geometry allows for very large junction arrays [13], thus opening the door to a variety of superconductor electronics applications [14] .In this paper we investigate a different approach to define planar weak-links in cuprate superconducting films. The idea is to create a nanoscale spatial modulation of T C by electrostatic doping [15] through ferroelectric field-effect [16][17][18].…”

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High-Temperature-Superconducting Weak Link Defined by the Ferroelectric Field Effect

et al. 2017

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In all-oxide ferroelectric (FE) / superconductor (S) bilayers, due to the low carrier concentration of oxides compared to transition metals, the FE interfacial polarization charges induce an accumulation (or depletion) of charge carriers in the S. This leads either to an enhancement or a depression of its critical temperature depending on FE polarization direction. Here we exploit this effect at a local scale to define planar weaklinks in high-temperature superconducting wires. This is realized in BiFeO 3 (FE)/YBa 2 Cu 3 O 7-x (S) bilayers in which the remnant FE domain structure is "written" at will by locally applying voltage pulses with a conductive-tip atomic force microscope. In this fashion, the FE domain pattern defines a spatial modulation of superconductivity. This allows us to "write" a device whose electrical transport shows different temperature regimes and magnetic field matching effects that are characteristic of Josephson coupled weak-links. This illustrates the potential of the ferroelectric approach for the realization of high-temperature superconducting devices. Josephson applications were early realized using low critical temperature (T C ) superconductors. However, the advent of high T C superconductivity prompted efforts to createJosephson devices using high-T C cuprates [6] capable of operating above liquid-nitrogen temperature. A versatile approach, developed during the last decade, exploits a nanoscale spatial modulation of T C in a superconducting film [7,8]. This is accomplished by controllably introducing structural disorder (mostly oxygen interstitials and vacancies) on a local scale, via masked ion irradiation or focused ion beams. That type of disorder locally depresses T C , which allows "patterning" the superconducting properties of the film [9,10]. Both S/N/S weak-links [7,8] and S/I/S tunnel junctions [11] can be defined in this way. Besides yielding very reproducible Josephson characteristics [12], the key advantage of this approach is that the planar geometry allows for very large junction arrays [13], thus opening the door to a variety of superconductor electronics applications [14] .In this paper we investigate a different approach to define planar weak-links in cuprate superconducting films. The idea is to create a nanoscale spatial modulation of T C by electrostatic doping [15] through ferroelectric field-effect [16][17][18]. This is achieved in ferroelectric (FE)/superconductor (S) bilayers in which we combine a FE (BiFeO 3 ) whose polarization has a strong out-of-plane component [19] and a high-T C superconductor (YBa 2 Cu 3 O 7-x ). In this FE/S structure, if the FE polarization points away from the interface, holes are accumulated in the S to screen the negative polarization charges, which enhances T C [red curve in Fig. 1(a)]. Conversely, if the FE points towards the interface, a hole depletion is induced, which leads to a depressed T C [blue curve in Fig. 1(a)]. Switching between those two remnant states is achieved by momentarily applying a gate voltage to reverse t...

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Improving the IcRn product and the reproducibility of high Tc Josephson junctions made by ion irradiation

Abstract: Fabrication of high-temperature superconductor Josephson junctions by focused ion beam milling

Cited by 5 publications

References 14 publications

High-T c Josephson junctions

High-T c Josephson junctions

Toward terahertz heterodyne detection with superconducting Josephson nano-junctions

High-Temperature-Superconducting Weak Link Defined by the Ferroelectric Field Effect

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