  Pairs fluctuation supercurrents and inverse lifetimes were measured on
epitaxial c-axis junctions of the cuprates in the pseudogap regime, with a
$PrBa_2Cu_3O_{7-\delta}$ barrier sandwiched in between two
$YBa_2Cu_3O_{7-\delta}$ or doped $YBa_2Cu_3O_y$ electrodes, with or without
magnetic fields parallel to the a-b planes. All junctions had a $\rm
T_c(high)\approx 85-90$ K and a $\rm T_c(low)\approx 50-55$ K electrodes,
allowing us to study pairs fluctuation supercurrents and inverse life times in
between these two temperatures. In junctions with a pseudogap electrode under
zero field, an excesss current due to pair fluctuations was observed which
persisted at temperatures above $\rm T_c(low)$, in the pseudogap regime, and up
to about $\rm T_c(high)$. No such excess current was observed in junctions
without a pseudo-gap in the electrode. The measured conductance spectra at
temperatures above $\rm T_c(low)$ were fitted using a modified fluctuations
model by Scalapino [Phys. Rev. Lett. \textbf{24}, 1052(1970)] of a junction
with a serial resistance. We found that in the pseudo-gap regime, the
conductance vs voltage consists of a narrow peak sitting on top of a very broad
peak. This yielded two distinct pairs fluctuation lifetimes in the pseudogap
electrode which differ by an order of magnitude up to about $\rm T_c(high)$.
Under in-plane fields, these two lifetime values remain separated in two
distinct groups, which varied with increasing field moderately. We also found
that detection of Amperian pairing [Phys. Rev. X \textbf{4}, 031017 (2014)] in
our cuprate junctions is not feasible, due to Josephson vortices penetration
into the superconducting electrodes which drove the necessary field above the
depairing field.
