Josephson vortex-flow transistors based on parallel arrays of YBa/sub 2/Cu/sub 3/O/sub 7-/spl delta// bicrystal grain boundary junctions

Three-terminal electronic devices based on flux-flow phenomena have attracted considerable interest due to their potential application in the interface between superconducting and semiconducting electronics. We have fabricated Josephson vortex flow transistors based on parallel arrays of YBa/sub 2/Cu/sub 3/O/sub 7-/spl delta// (YBCO) bicrystal Grain Boundary Junctions (GBJs). The array critical current I/sub c/ has been measured as a function of an external magnetic field B or the magnetic field of the current I/sub ctrl/ that is fed through the control line coupled inductively to the array. By varying the device geometry we have studied the influence of the coupling of the magnetic control and the array parameters such as the number N of discrete Josephson elements and the screening parameter /spl beta//sub L/ on the I/sub c/(B) dependences of the arrays. Going from /spl beta//sub L//spl Lt/1 to /spl beta//sub L//spl Gt/1 the measured I/sub c/(B) curves changed from a dependence similar to the diffraction pattern of a grid to a dependence dominated by the parameters of a single array cell. The impact on the available current gain is discussed.<
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