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Grain boundary bicrystal Josephson junctions of the electron-dopedinfinite-layer superconductor Sr$_{1-x}$La$_x$CuO$_2$ ($x = 0.15$) were grownby pulsed laser deposition. BaTiO$_3$-buffered $24\,^\circ$ [001]-tiltsymmetric SrTiO$_3$ bicrystals were used as substrates. We examined both Cooperpair (CP) and quasiparticle (QP) tunneling by electric transport measurementsat temperatures down to 4.2\,K. CP tunneling revealed an extraordinary highcritical current density for electron-doped cuprates of $j_c > 10^3\,$A/cm$^2$at 4.2\,K. Thermally activated phase slippage was observed as dissipativemechanism close to the transition temperature. Out-of-plane magnetic fields $H$revealed a remarkably regular Fraunhofer-like $j_c(H)$ pattern as well as Fiskeand flux flow resonances, both yielding a Swihart velocity of$3.1\cdot10^6\,$m/s. Furthermore, we examined the superconducting gap by meansof QP tunneling spectroscopy. The gap was found to be V-shaped with anextrapolated zero temperature energy gap $\Delta_0 \approx 2.4\,$meV. No zerobias conductance peak was observed.

Importance of grain boundary Josephson junctions in the electron-doped infinite-layer cuprate superconductor Sr$_{1-x}$La$_x$CuO$_2$