Fabrication and characterisation of YBCO single grain boundary step edge junctions

Foley, C. P.; Mitchell, E.E.; Lam, Siu Shu Eddie; Sankrithyan, B; Wilson, Y.; Tilbrook, David; Morris, Stephen

doi:10.1109/77.783971

Cited by 114 publications

(103 citation statements)

References 10 publications

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“…4. The devices are highly reproducible, on-chip and from chip to chip, as evidenced by critical-current and resistor measurements [5], [6].…”

Section: B Junctionsmentioning

confidence: 99%

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Simulation and Measurement of HTS Josephson Heterodyne Oscillator

Macfarlane

Taylor³

et al. 2009

IEEE Trans. Appl. Supercond.

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The Strathprints institutional repository (https://strathprints.strath.ac.uk) is a digital archive of University of Strathclyde research outputs. It has been developed to disseminate open access research outputs, expose data about those outputs, and enable the management and persistent access to Strathclyde's intellectual output. We have now modified the fabrication procedures, and adjusted the shunt resistors and bias current values so that higher frequencies can be achieved. The Josephson junctions are of step-edge type, rather than the bi-crystal type used in our earlier work. The step-edge technique permits much more flexibility in the geometrical lay-out and utilizes the more cost-effective single-crystal MgO substrates. In the present paper, we report numerical simulations and experimental measurements on these devices in the frequency range up to 2 GHz.

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“…4. The devices are highly reproducible, on-chip and from chip to chip, as evidenced by critical-current and resistor measurements [5], [6].…”

Section: B Junctionsmentioning

confidence: 99%

“…The devices are based on the established step-edge YBCO junction technology developed at CSIRO [5], [6]. The MgO substrates were first etched by Ar-ion beam to produce steps of 400 nm high in the desired positions.…”

Section: B Junctionsmentioning

confidence: 99%

Simulation and Measurement of HTS Josephson Heterodyne Oscillator

Macfarlane

Taylor³

et al. 2009

IEEE Trans. Appl. Supercond.

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“…This process allows us to obtain the step-edges with the optimised step-angle of 33 °. [ 15 ] The epitaxial, c -axis oriented, 200 nm thick monolayered YBCO and multilayered YBCO/NdBCO/YBCO thin fi lms were grown by pulsed laser deposition (PLD). [ 14,16 ] …”

Section: Doi: 101002/admi201300112mentioning

confidence: 99%

Enhancing Properties of High‐Temperature Superconducting Step‐Edge Josephson Junctions by Nano‐Multilayers with a Small Mismatch

Pan

Shcherbakova

Fedoseev

et al. 2014

Adv Materials Inter

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activated motion in these superconducting structures. [ 6 ] One of the approaches to minimize the 1/f noise caused by vortex motion is improvement of pinning properties and, hence, the critical current density ( J c ) of the superconducting fi lm. Recently, the noise performance of HTS SQUID has been improved in a magnetic environment by using YBCO fi lm with a large thickness and high J c value. [ 8 ] We have also demonstrated that fi lms with better structural integrity (smooth, no holes) minimize fl ux creep and vortex hopping in alternating magnetic fi elds and have lower 1/f noise. [ 9 ] Thus, the materials technology needs for qubits are similar to the requirements of SQUID applications, also having Josephson junctions as their basic element. High quality YBCO Josephson junctions play a key-role in the successful implementation of HTS superconducting circuits at 77 K. [ 6 ] This is mainly due to YBCO material properties, resulting from the complexity of structural characteristics and having strong infl uence on the transport properties of YBCO. [ 10 ] A range of different types of YBCO junctions have been engineered. [ 10 ] Among them, stepedge junctions are singled out due to their low cost, relatively high characteristic voltage (the so-called I R c n value of 100 to 400 μV at 77 K, [ 7,11 ] where I c is the critical current and R n is the resistance in the normal state), and excellent integrability and the scalability of the junctions. These features enable miniaturization and high effi ciency of electronic circuits, as well as applications in magnetic sensing and terahertz (THz) imaging. [ 12,13 ] Therefore, the combined enhancement of fl ux pinning, critical current and microstructure in the YBCO junctions is a crucial task for obtaining tailored junction properties towards the well-defi ned requirements. [ 1 ] In this work, we demonstrate a new straightforward, but effective multilayering approach for fabrication of HTS step-edge junctions with signifi cantly enhanced characteristics. The alternation of main YBCO and intermediate NdBa 2 Cu 3 O 7 (NdBCO) superconducting layers was shown to dramatically improve surface morphology of 1 μm thick fi lms. [ 14 ] Furthermore, this architecture resulted in considerable enhancement of fl ux pinning and current-carrying ability over a wide range of magnetic fi elds and temperatures. We have successfully managed to apply this technology to YBCO step-edge junctions and to demonstrate signifi cant enhancement of transport and structural properties in these junctions. This approach is preferred over the fabrication of thick fi lm, [ 8 ] because it enables structural tailoring with simultaneous adjustment of transport properties required for junction performance. Thus, the multilayered deposition is offering a new promising approach for applications in HTS-based electronics.Recent signifi cant progress in superconducting qubits (based on Josephson junctions) has achieved coherence times approaching to the practically required for quantum computers. [ 1 ] At the same...

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“…An important outcome of this program was the development of a step-edge Josephson junction (SEJ) technology that allows a junction to be positioned anywhere on a MgO (001) substrate and is suitable for fabricating multiple devices or arrays on a single chip [8,9]. This technology has proven to be a cost effective process for fabricating HTS SQUIDs and other junction-based devices.…”

Section: High Temperature Squid Magnetometersmentioning

confidence: 99%

An overview of some of CSIRO’s “Underground Science” capabilities

Leslie

Dewhurst²

2011

I-Dust 2010

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Abstract. CSIRO is a multi-disciplined, Australian Government funded, science organisation whose major aims include the investigation of science issues that are of particular relevance to Australia in a global context. The organisation has over 5700 employees. This review paper contains a broad outline of some of the "underground science" capabilities found within CSIRO, with an emphasis on SQUID-based sensors developed within the CSIRO's Superconductivity Group and the general capabilities to be found within CSIRO's Petroleum Geoscience Program.

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Fabrication and characterisation of YBCO single grain boundary step edge junctions

Cited by 114 publications

References 10 publications

Simulation and Measurement of HTS Josephson Heterodyne Oscillator

Simulation and Measurement of HTS Josephson Heterodyne Oscillator

Enhancing Properties of High‐Temperature Superconducting Step‐Edge Josephson Junctions by Nano‐Multilayers with a Small Mismatch

An overview of some of CSIRO’s “Underground Science” capabilities

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