Abstract
We have studied the low-temperature behavior of lead-alloy Josephson tunnel junctions with area S\ensuremath{\approxeq}0.01 \ensuremath{\mu}${\mathrm{m}}^{2}$, isolated from their electromagnetic environment by high-resistance metallic resistors inserted into the current and voltage leads. Under irradiation with microwaves frequencies, f=3.5--10 GHz, the dc differential resistance dV/dI, as a function of the dc current I, showed peaks at I=\ifmmode\pm\else\textpm\fi{}2ef. This effect, and other observations, arises due to the periodic electrical recharging of the junction by discrete Cooper pairs, and can be explained by the ``orthodox'' theory of Bloch oscillations.
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