If a computer could be assembled from superconducting components, the en-
ergy efficiency would far surpass that of conventional electronics. Historic re-
search efforts towards this goal yielded pivotal breakthroughs in the develop-
ment and discovery of scanning tunnelling microscopy1 and high temperature
superconductivity.2 Although recent strides have been taken in advancing su-
perconducting diode3, 4 and switching5 technologies, harnessing read/writeable
memory functionality in superconducting platforms has remained challenging.
Here we show that bulk single crystal specimens of the triplet superconductor
candidate uranium ditelluride (UTe2)6–8 possess such properties. Upon ap-
plying a magnetic field to access an intermediate regime straddling two dis-
tinct superconducting phases,9, 10 we find that direct current pulses can push
the material in and out of a metastable state possessing an enhanced criti-
cal 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. We interpret this to be due to competition be-
tween two distinct vortex species, which can be perturbatively pushed into a
non-equilibrium high-disorder configuration with stronger pinning forces and
thus higher 𝐽𝑐. Rather than requiring proximate magnetic or semiconducting
interfaces,11–14 this memory functionality appears to be an intrinsic property
of UTe2 rooted in the superconducting order itself. Our findings underscore
the rich complexity of putatively 𝑝-wave vortex matter and demonstrate the
viability of engineering a new class of superconducting memory elements with
ultralow-power switching, which could be transformative for cryogenic com-
puting and quantum hardware.