Vortex flow characteristics of high-<i>T</i> <i>c</i> flux flow transistors

Abstract

High-Tc superconducting flux flow transistors were fabricated from thin films of coevaporated YBaCuO. The vortex flow characteristics of the devices were experimentally investigated. The flow velocity of a vortex along a channel was measured from the applied magnetic field dependence of the I-V characteristics. It is 3.6–6.9×105 m/s when the bias current is 3–6 mA. This value is of the same order as that of a Josephson vortex flowing along a barrier region in a super-normal-super junction, and more than three orders of magnitude larger than that in type-II metal superconducting thin films.