Abstract
In thin BSCCO (2212) whisker-based superconducting bridges with width and length ≤ 1 μm we observe random telegraph noise at discrete values of current. We show that the noise is associated with spontaneous processes of addition and removal of discrete vortex trains and reflects the regular structure of steps on the I–V curves. The average lifetime of the trains τ falls down with increasing temperature T in a complex way: intervals of steep drop (∼ an order of magnitude per Kelvin) are separated with a plateau of τ(T) with τ ∼ 10−2 s. The 70 GHz irradiation with 100 μW power results in the growth of the average switching frequency by 5 orders of magnitude; thus the HTSC bridges could be efficient detectors of microwave radiation. We discuss the peculiar features of τ(T).
Published Version
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