Abstract
A possible cooperation between ferroelectric and superconducting order parameters in SrTiO${}_{3}$ has long been suspected. Here, the authors find that the superconducting critical temperature of SrTiO${}_{3}$ correlates with the length scale of polar order. The findings point to spin-orbit coupling as an important ingredient in the superconductivity of SrTiO${}_{3}$. The ability to control the size of the polar domains in thin films opens up new opportunities to control the superconductivity in SrTiO${}_{3}$ and other superconductors that exhibit local polar order
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