Large scale two-dimensional arrays of magnesium diboride superconducting quantum interference devices

Cybart, Shane A.; Wong, T. J.; Cho, Ethan Y.; Beeman, J. W.; Yung, C. S.; Moeckly, B. H.; Dynes, R. C.

doi:10.1063/1.4876129

Cited by 10 publications

(9 citation statements)

References 26 publications

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“…Large arrays have been produced [4,31,32] with up to 36 000 JJ. We recently showed that a 4000 JJ SQIF can have a transfer factor ∂V DC /∂B ∼ 1000 V /T [33,34] which is very encouraging.…”

Section: Introductionmentioning

confidence: 99%

Static and radio frequency magnetic response of high T _c superconducting quantum interference filters made by ion irradiation

Pawlowski¹,

Kermorvant²,

Crété³

et al. 2018

Supercond. Sci. Technol.

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Superconducting Quantum Interference Filters (SQIF) are promising devices for Radio-Frequency (RF) detection combining low noise, high sensitivity, large dynamic range and wide-band capabilities. Impressive progress have been made recently in the field, with SQIF based antennas and amplifiers showing interesting properties in the GHz range using the well-established Nb/AlOx technology. The possibility to extend these results to High Temperature Superconductors (HTS) is still open, and different techniques to fabricate HTS SQIFs are competing to make RF devices.We report on the DC and RF response of a High Temperature SQIF fabricated by the ion irradiation technique. It is made of 1000 Superconducting QUantum Interference Devices (SQUIDs) in series, with loop areas randomly distributed between 6 µm 2 and 60 µm 2 . The DC transfer factor is ∼ 450 V T −1 at optimal bias and temperature, and the maximum voltage swing ∼ 2.5 mV . We show that such a SQIF detects RF signals up to 150 MHz. It presents linear characteristics for RF power spanning more than five decades, and non-linearities develop beyond P RF = −35 dBm in our set-up configuration. Second-harmonic generation has been shown to be minimum at the functioning point in the whole range of frequencies. A model has been developed which captures the essential features of the SQIF RF response.

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Section: Introductionmentioning

confidence: 99%

Static and radio frequency magnetic response of high T _c superconducting quantum interference filters made by ion irradiation

Pawlowski¹,

Kermorvant²,

Crété³

et al. 2018

Supercond. Sci. Technol.

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“…However, with a transition temperature of 9.25 K, practical operating temperatures for Nb devices are around 4 K and require expensive cryogenic cooling with large power requirements. The simple and cheapto-fabricate compound MgB 2 , with a high critical temperature of 40 K, large superconducting energy gaps greater than 2 meV, and small penetration depth of ∼40 nm, offers a promising alternative [3]- [6] in higher operating speed and temperatures than Nb circuits.…”

Section: Introductionmentioning

confidence: 99%

Study of $\hbox{MgB}_{2}$ Josephson Junction Arrays and Sub- $\mu\hbox{m}$ Junctions

Melbourne

Cunnane

Galan

et al. 2015

IEEE Trans. Appl. Supercond.

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Sandwich-type MgB 2 /MgO/MgB 2 Josephson junctions with sizes ranging from 0.5 μm × 0.5 μm to 10 μm × 10 μm were fabricated using electron beam lithography. The junctions show critical current densities as high as 130 kA/cm 2 . The smallest of the junctions operated free of hysteresis below 4.2 K. They may be ideal for use in rapid single flux quantum circuits with no requirement for external shunt resistors. The 10-μm junctions show good agreement with the expected Fraunhofer-like modulation of critical current with magnetic field; however, the smaller junctions show a sinusoidal modulation, indicating an anomalous current distribution that needs to be further investigated. Series arrays of Josephson junctions were made to quantitatively study the uniformity of junction parameters, which shows a 54% spread in critical current of a 100 junction array of 4-μm junctions.

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“…Similar electronic structures between S and N layers and a finite SC pairing interaction in the N layer are considered as sources for the enhanced proximity effect 13,14,16,24 . Conventional superconductor MgB 2 with relatively high T c of 40 K is a good candidate for GPE realization via the ion irradiation technique because of its large superconducting coherence length, metallicity, and large superconducting energy gap 25,26 .…”

Section: Introductionmentioning

confidence: 99%

Giant proximity effect in single-crystalline MgB2 bilayers

Jung

Pham

Park

et al. 2019

Sci Rep

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Although giant proximity effect (GPE) can shed important information on understanding superconducting pairing mechanisms and superconducting electronics, reports on the GPE are few because the fabrication of the junctions with GPE is technologically difficult. Here, we report a GPE in the single-crystalline MgB 2 bilayers ( S ′/ S ), where the S ′ is the damaged MgB 2 layer by cobalt (Co)-ion irradiation and the S is the undamaged MgB 2 layer. Superconducting properties of the S ′ is remarkably degraded by the irradiation, whereas those of the S is uninfluenced by the irradiation. The degraded superconductivity in the S ′ is fully recovered by increasing the thickness of undamaged MgB 2 layer S despite almost ten times larger thickness ~ 95 nm of S ′ than the superconducting coherence length ξ ab (0) ~ 8.5 nm of the S , indicating a presence of GPE in the S ′ /S MgB 2 bilayers. A diffusion of electrons in the S ′ into the S can reduce a pair breaking scattering in the S ′, and the similar electronic structures of S ′ and S layers and a finite attractive electron-electron interaction in the S ′ are thought to be origins of unpredicted GPE between the same superconducting materials. Both upper critical field ( μ 0 H c2 ) and in-field critical current density ( J c ) of S ′/ S bilayers show a significant enhancement, representing a strong correlation between S ′ and S . These discoveries provide the blue print to the design of the superconducting multilayers for fundamental researches on the mechanism of the GPE as well as their technological applications.

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Large scale two-dimensional arrays of magnesium diboride superconducting quantum interference devices

Cited by 10 publications

References 26 publications

Static and radio frequency magnetic response of high T _c superconducting quantum interference filters made by ion irradiation

Static and radio frequency magnetic response of high T _c superconducting quantum interference filters made by ion irradiation

Study of $\hbox{MgB}_{2}$ Josephson Junction Arrays and Sub- $\mu\hbox{m}$ Junctions

Giant proximity effect in single-crystalline MgB2 bilayers

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Large scale two-dimensional arrays of magnesium diboride superconducting quantum interference devices

Cited by 10 publications

References 26 publications

Static and radio frequency magnetic response of high T c superconducting quantum interference filters made by ion irradiation

Static and radio frequency magnetic response of high T c superconducting quantum interference filters made by ion irradiation

Study of $\hbox{MgB}_{2}$ Josephson Junction Arrays and Sub- $\mu\hbox{m}$ Junctions

Giant proximity effect in single-crystalline MgB2 bilayers

Contact Info

Product

Resources

About

Static and radio frequency magnetic response of high T _c superconducting quantum interference filters made by ion irradiation

Static and radio frequency magnetic response of high T _c superconducting quantum interference filters made by ion irradiation