Abstract
We have studied both theoretically and experimentally the low-frequency behaviour of discrete HTS Josephson vortex flow transistors. The devices were fabricated from YBa 2Cu 3O 7 thin films grown on 24° SrTiO 3 bicrystal substrates. They consist of an asymmetric array of 10 or 20 Josephson junctions, with a control current fed through an independent line that is inductively coupled to the array. We have measured current gains up to 40 at 77 K and substantially higher at lower temperatures. We discuss the results of simulations of the device behaviour and consider the effects of junction critical current, number of junctions and array loop inductance. We compare the measured device behaviour at 77 K with simulations which include the effects of thermal noise.
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