High speed components based on high-Tc superconducting grain boundary junctions
Konferensbidrag (offentliggjort, men ej förlagsutgivet), 1996

Artificial grain boundary junctions of both bi-crystal and step edge configurations have been characterized at high frequency using Fiske type resonances as well as flux flow induced steps in the current-voltage curve. A dielectric behavior of the barrier with sufficiently low microwave losses to allow resonances is indicated. Deduced values of the barrier thickness, the penetration depth, and surface microwave losses agree with those from other measurements. Long grain boundary junctions, as well as parallel arrays of shorter junctions, have been used in Josephson Flux Flow Transistors (J-FFT). Asymmetrically coupled devices give considerable current gain at low temperature. Grain boundary junctions have also been employed in simple Rapid Single Flux Quantum (RSFQ) circuits to demonstrate functions like flip flop, voltage divider and voltage doubler. A single superconducting layer technology implies small inductances formed as narrow slits in the deposited film. A tri-layer technology is superior but puts demands on insulation and strip cross-overs. Presently available high-Tc junctions are not sufficiently reproducible to allow large scale integrated circuits. Another limitation is the limited performance (for example given by the junction IcRn product) of present junctions at 77 K

superconducting integrated circuits

bicrystals

grain boundaries

superconducting transistors

superconducting junction devices

penetration depth (superconductivity)

high-temperature superconductors

flux flow

Författare

Tord Claeson

Institutionen för fysik

Zdravko Ivanov

Institutionen för fysik

V. Kaplunenko

Institutionen för fysik

Bengt Nilsson

Institutionen för fysik

Evgeni Stepantsov

Institutionen för fysik

E. Wikborg

Institutionen för fysik

Dag Winkler

Institutionen för fysik

Huai-ren Yi

Institutionen för fysik

Y. M. Zhang

Institutionen för fysik

1996 International Workshop on Superconductivity. `High Temperature Superconducting Electronics: Fundamentals and Applications. Program and Extended Abstracts

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Styrkeområden

Nanovetenskap och nanoteknik

Ämneskategorier

Annan elektroteknik och elektronik