Flux-flow transistors based on long YBa2Cu3O7−δ bicrystal grain boundary junctions
- 28 February 1994
- journal article
- research article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 64 (9) , 1153-1155
- https://doi.org/10.1063/1.110836
Abstract
Josephson flux‐flow transistors were made from long YBa2Cu3O7−δ bicrystal grain boundary junctions. A normal metal loop, separated from the junction by an SiO layer, was used as the current control line. The line modulated the critical current, Ic , which for temperatures ≤60 K showed the typical dependence for a long junction, while at higher temperatures the regular small junction modulation was seen. Current gain larger than unity was obtained below 70 K. The current gain increased with the junction length, and varied roughly like √Ic when decreasing the temperature. A transresistance larger than 5 Ω was obtained at 15 K. Better performance is expected from junctions with higher current densities.Keywords
This publication has 7 references indexed in Scilit:
- Linewidth measurements of Josephson flux-flow oscillators in the band 280–330 GHzApplied Physics Letters, 1993
- Flux flow microelectronicsIEEE Transactions on Applied Superconductivity, 1993
- The RF performance of long junction active devices using TlCaBaCuO step edge structuresIEEE Transactions on Applied Superconductivity, 1992
- Weak links and dc SQUIDS on artificial nonsymmetric grain boundaries in YBa2Cu3O7−δApplied Physics Letters, 1991
- A Josephson junction to FET high speed line driver made of TlCaBaCuOIEEE Transactions on Magnetics, 1991
- Superconducting current injection transistorApplied Physics Letters, 1983
- A Josephson vortex-flow deviceApplied Physics Letters, 1981