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Manipulating the superconducting states of high-T_c cuprate superconductorsin an efficient and reliable way is of great importance for their applicationsin next-generation electronics. Traditional methods are mostly based on atrial-and-error method that is difficult to implement and time consuming. Here,employing ionic liquid gating, a selective control of volatile and non-volatilesuperconductivity is achieved in pristine insulating Pr_2CuO_{4\pm\delta} film,based on two distinct mechanisms: 1) with positive electric fields, the filmcan be reversibly switched between non-superconducting and superconductingstates, attributed to the carrier doping effect. 2) The film becomes moreresistive by applying negative bias voltage up to -4 V, but strikingly, anon-volatile superconductivity is achieved once the gate voltage is removed.Such a persistent superconducting state represents a novel phenomenon in copperoxides, resulting from the doping healing of oxygen vacancies in copper-oxygenplanes as unraveled by high-resolution scanning transmission electronmicroscope and in-situ x-ray diffraction experiments. The effectivemanipulation and mastering of volatile/non-volatile superconductivity in thesame parent cuprate opens the door to more functionalities for superconductingelectronics, as well as supplies flexible samples for investigating the natureof quantum phase transitions in high-T_c superconductors.

Non-Volatile Superconductivity in an Insulating Copper Oxide Induced via Ionic Liquid Gating