Evidence item

Here we show that bulk single crystal specimens of the triplet superconductor candidate uranium ditelluride (UTe2) possess such properties. Upon applying a magnetic field to access an intermediate regime straddling two distinct superconducting phases, we find that direct current pulses can push the material in and out of a metastable state possessing an enhanced critical current Jc. This switching is controllable by the strength and duration of the stimuli, with the system ‘remembering’ whether it is in the high or low Jc state for extended periods. This high-Jc state persists for hours ... The system can then be reset ... by gradually ramping back down to zero current. This could be thought of as annealing the system, thereby returning to the equilibrium low-Jc state.