  The key ingredient of high critical currents in a type-II superconductor is
defect sites that 'pin' vortices. Contrary to earlier understanding on
nano-patterned artificial pinning, here we show unequivocally the advantages of
a random pinscape over an ordered array in a wide magnetic field range. We
reveal that the better performance of a random pinscape is due to the variation
of its local-density-of-pinning-sites (LDOPS), which mitigates the motion of
vortices. This is confirmed by achieving even higher enhancement of the
critical current through a conformally mapped random pinscape, where the
distribution of the LDOPS is further enlarged. The demonstrated key role of
LDOPS in enhancing superconducting critical currents gets at the heart of
random versus commensurate pinning. Our findings highlight the importance of
random pinscapes in enhancing the superconducting critical currents of applied
superconductors.
