YBCO Josephson Junctions and Striplines for RSFQ Circuits Made by Ion Irradiation

Wolf, Thomas; Bergeal, N.; Lesueur, J.; Fourie, Coenrad J.; Faini, G.; Ulysse, C.; Febvre, Pascal

doi:10.1109/tasc.2012.2237513

Cited by 21 publications

(15 citation statements)

References 25 publications

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“…In this analysis, we used the Likharev-Semenov model which has been proposed for short Josephson junction corresponding to the regime L < λ J where λ J = Φ 0 2πµ 0 jcd is the Josephson penetration length (λ L is the London penetration length, d = 2λ L + l, j c is the critical current density and µ 0 is the vacuum permeability). Assuming a London penetration depth λ L (0) ∼ 200 nm for our YBa 2 Cu 3 O 7 junctions [32], the Josephson length is λ J ≈ 600 nm for a critical current of 100 µA which is comparable to the width of the junction L=750 nm. Therefore, for the lower part of the temperature range investigated here, the junction is not strictly short and the Likharev-Semenov model may not give a very accurate result.…”

Section: Generation Linewidthmentioning

confidence: 99%

Josephson oscillation linewidth of ion-irradiated YBa₂Cu₃O₇junctions

Sharafiev

Malnou

Feuillet-Palma

et al. 2016

Supercond. Sci. Technol.

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Abstract. We report on the noise properties of ion-irradiated YBa 2 Cu 3 O 7 Josephson junctions. This work aims at investigating the linewidth of the Josephson oscillation with a detector response experiment at 132 GHz. Experimental results are compared with a simple analytical model based on the Likharev-Semenov equation and the de Gennes dirty limit approximation. We show that the main source of low-frequency fluctuations in these junctions is the broadband Johnson noise and that the excess (

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Section: Generation Linewidthmentioning

confidence: 99%

Josephson oscillation linewidth of ion-irradiated YBa₂Cu₃O₇junctions

Sharafiev

Malnou

Feuillet-Palma

et al. 2016

Supercond. Sci. Technol.

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“…We used the Inductex software to calculate the inductance of the SQUID which includes High-Tc Superconducting Quantum Interference Filters (SQIFs) made by ion irradiation8 geometric (L geo ) and kinetic inductance (L K ) since for these temperature this latter is not negligible anymore. L K depends on the superconducting penetration depth λ L , which varies with temperature according to the Gorter-Casimir formula [35,36,37] :…”

Section: Characteristics Of a Dc-squid Made By Ion Irradiationmentioning

confidence: 99%

High-Tc superconducting quantum interference filters (SQIFs) made by ion irradiation

Ouanani

Kermorvant

Ulysse

et al. 2016

Supercond. Sci. Technol.

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Abstract.Superconducting Quantum Interference Filters (SQIFs) are arrays of superconducting loops of different sizes including Josephson Junctions (JJ). For a random distribution of sizes, they present a non-periodic response to an applied magnetic field, with a large transfer function and a magnetic field sensitivity potentially improved with respect to that of a single SQUID. Such properties make SQIFs interesting devices arXiv:1603.07592v2 [cond-mat.supr-con] 1 Jun 2016High-Tc Superconducting Quantum Interference Filters (SQIFs) made by ion irradiation2 to detect the magnetic component of electromagnetic waves at microwave frequencies.We have used the highly scalable technique of ion irradiation to make SQUIDs and SQIFs based on commercial YBa 2 Cu 3 O 7 films, and studied their properties. Both display optimum performances as a function of temperature and bias current, that can be understood in the frame of numerical simulations that we developed. The role of asymmetries and dispersion in JJ characteristics (routinely found in High Tc Superconductors technologies) is also studied. We have found that both do not impede the existence of a SQIF effect but play a role on the emergence of the optimal point. We finally present results on SQIF made with 2000 SQUID in series, showing a transfer function dV /dB ∼ 1000V /T .

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“…In particular, ion irradiation of oxide materials has been used for both device fabrication and material modification. [25,26] In LAO/STO, ion beam irradiation processes have been essentially used to induce metal-to-insulator (MIT) transition at the interface by creating defects (amorphization, local disorder) and strains in the heterostructure, either by using 150-350 eV monoatomic argon ions, [27,28] low-Z (2-MeV hydrogen and 500-keV helium) ions [29] or 50-keV oxygen ions [30] (see Table SI-1 in part 1 of Supporting Information).…”

Section: Introductionmentioning

confidence: 99%

Tuning the electronic properties of LaAlO3 / SrTiO3 interfaces by irradiating the LaAlO3 surface with low-energy cluster ion beams

et al. 2018

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We have investigated the effects of low-energy ion beam irradiations using argon clusters on the chemical and electronic properties of LaAlO 3 /SrTiO 3 (LAO/STO) heterointerfaces by combining X-ray photoelectron spectroscopy (XPS) and electrical transport measurements. Due to its unique features, we show that a short-time cluster ion irradiation of the LAO surface induces indirect modifications in the chemical properties of the buried STO substrate, with (1) what is observed by using higher energy ion beam techniques, this leads to an increase of the electrical conductivity at the LAO/STO interface. Our XPS data clearly reveal the existence of dynamical processes on the titanium and strontium atoms, which compete with the effect of the cluster ion beam irradiation. These relaxation effects are in part attributed to the diffusion of the ion-induced oxygen vacancies in the entire heterostructure, since an increase of the interfacial metallicity is also evidenced far from the irradiated area. These results demonstrate that a local perturbation of the LAO surface can induce new properties at the interface and in the entire heterostructure. This study highlights the possibility of tuning the electronic properties of LAO/STO interfaces by surface engineering, confirming experimentally the intimate connection between LAO surface chemistry and electronic properties of LAO/STO interfaces.3

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YBCO Josephson Junctions and Striplines for RSFQ Circuits Made by Ion Irradiation

Cited by 21 publications

References 25 publications

Josephson oscillation linewidth of ion-irradiated YBa₂Cu₃O₇junctions

Josephson oscillation linewidth of ion-irradiated YBa₂Cu₃O₇junctions

High-Tc superconducting quantum interference filters (SQIFs) made by ion irradiation

Tuning the electronic properties of LaAlO3 / SrTiO3 interfaces by irradiating the LaAlO3 surface with low-energy cluster ion beams

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YBCO Josephson Junctions and Striplines for RSFQ Circuits Made by Ion Irradiation

Cited by 21 publications

References 25 publications

Josephson oscillation linewidth of ion-irradiated YBa2Cu3O7junctions

Josephson oscillation linewidth of ion-irradiated YBa2Cu3O7junctions

High-Tc superconducting quantum interference filters (SQIFs) made by ion irradiation

Tuning the electronic properties of LaAlO3 / SrTiO3 interfaces by irradiating the LaAlO3 surface with low-energy cluster ion beams

Contact Info

Product

Resources

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Josephson oscillation linewidth of ion-irradiated YBa₂Cu₃O₇junctions

Josephson oscillation linewidth of ion-irradiated YBa₂Cu₃O₇junctions