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Proximity effects and pair currents were measured in epitaxial trilayer\textit{c-axis} junctions comprise of a $PrBa_2Cu_3O_{7-\delta}$ barriersandwiched in between an overdoped $Y_{0.94}Ca_{0.06}Ba_2Cu_3O_{7-\delta}$ andunderdoped $YBa_2Cu_{2.7}Co_{0.3}O_y$ layers. These junctions had two $\rm T_c$values of $\rm T_c(high)=84-86$ K and $\rm T_c(low)=50-55$ K, allowinginvestigation when both electrodes are superconducting, or when only one issuperconducting while the other is in its pseudogap regime. For T below $\rmT_c(high)$ but much above $\rm T_c(low)$, two distinct proximity effecttransitions were observed in the resistance at two temperature regimes, between80 and 84 K, and 76 to 80 K. The first is a conventional proximity effect withthe $\rm T_c(high)$ electrode, while the second is a second-order proximityeffect of this electrode with uncorrelated pairs in the pseudogap regime.Conductance spectra measured between 2 and 86 K showed four different $I_c$pair currents which were attributed to coherent pairs tunneling through thebarrier below 42 K, to fluctuating pairs current up to $\sim$77 K, and toproximity pairs current between 77 and 84 K. All pair currents were suppressedunder magnetic fields, with two distinct decay parameters that originated inthe two different electrodes, with a significant suppression observed in thepseudogap regime.

Proximity effects and pair currents in cuprate junctions