Gate-tunable superconductivity at the amorphous LaAlO$_{3}$/SrTiO$_{3}$ interface
The two-dimensional electron liquid at the crystalline LaAlO$_{3}$/SrTiO$_{3}$ (c-LAO/STO) interface has sparked large interest due to the coexistence of magnetism and superconductivity. Interfaces based on amorphous top layers grown at room temperature, i.e. amorphous LAO/STO (a-LAO/STO), show similar characteristics to c-LAO/STO; however, superconductivity has not yet been reported in this system. Here we report superconductivity in patterned devices at the a-LAO/STO interface. The superconducting phase transition is studied through the dependence of the sheet resistance and critical current on temperature and magnetic field. The critical temperature shows a dome-shaped dependence on backgate voltage with a maximum of $460 \, \mathrm{mK}$, higher than any previously reported values for c-LAO/STO. Evidence is found for a superconducting phase originating from a Josephson-coupled array of superconducting puddles, possibly induced by inhomogeneous doping.