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An environmentally stable mesoscopic thin film of Au of certain thickness hasbeen deposited thermally on top of a Ag+ implanted oxide substrate to develop aclose to room temperature superconductor. This thin film has been deposited intwo different stages. Initially, a sol-gel derived ion conducting metal oxide(ICMO) thin film has been deposited by spin coating. Afterward, Ag+ has beenintroduced inside ICMO thin film by a chemical method. Following this, a thinlayer of Au has been deposited on top of that Ag ion-implanted oxide viathermal evaporation. The temperature dependent resistivity (R-T) has beenstudied by four probe method. During high-to-low temperature sweep, around 240K this thin film sample shows a sudden drop of resistance from 0.7 Ohm to 0.1micro-Ohm. This 6-7 orders drop of resistance has been observed instantlywithin <0.1 K temperature variation of the sample. This transition temperature(TC) has been shifted toward the higher temperature by 5-6 degrees whentemperature has been increased from low to the higher side. During 2nd and 3rdtemperature cycling, both these transitions have been shifted by ~10 K towardsroom temperature w.r.t the earlier. However, after three successive temperaturecycles, TC becomes stable and transitions occur close to 0 oC repeatedly. Atthe low resistance phase, current level has been varied from +100 mA to -100 mAwhich shows a random fluctuation of voltage drop within 10 nV range, indicatingresistance under such circumstance is too low to measure by Delta modeelectrical measurement (0.1 micro-Ohm). Besides, transition temperature reducesto lower temperature by 4 K, after applying 1 tesla magnetic fieldperpendicular to the thin film. Few YouTube video links of temperaturedependent electrical characterization of such a thin film is given next to theacknowledgement section.

Observation of near room temperature thin film superconductivity of atmospherically stable Ag-Au mesoscopic thin film