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For more than 30 years, the remarkable superconducting properties ofREBa$_\textrm{2}$Cu$_\textrm{3}$O$_\textrm{7-x}$ (RE = rare earth) compoundshave triggered research studies across the world. Accordingly, significantprogresses have been made both from a basic understanding and a fabricationprocesses perspective. Yet, today, the major technological bottleneck towardsthe spread of their practical uses remains the exponential decay of theircritical current with grain misorientation in polycrystalline samples. In thiswork, we used an ionic liquid to apply extremely high transverse electricfields to YBa$_\textrm{2}$Cu$_\textrm{3}$O$_\textrm{7-x}$ thin films containinga single well-defined low-angle grain boundary. Our study shows that thistechnique is very effective to tune the IV characteristics of these weak-links.In-magnetic field measurements allow us to discuss the type of the vorticespresent at the grain boundary and to unveil a large variation of the localdepairing current density with gating. Comparing our results with the onesobtained on chemically-doped grain boundaries, we discuss routes to evaluatethe role of local strain in the loss of transparency at cuprates low-anglegrain boundaries. In short, this study offers a new opportunity to discussscenarios leading to the reduced transport capabilities of grain boundaries incuprates.

Strong improvement of the transport characteristics of YBa$_\textrm{2}$Cu$_\textrm{3}$O$_\textrm{7-x}$ grain boundaries using ionic liquid gating