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A central issue for copper oxides is the nature of the insulating groundstate at low carrier densities and the emergence of high-temperaturesuperconductivity from that state with doping. Even though thissuperconductor-insulator transition (SIT) is a zero-temperature transition,measurements are not usually carried out at low temperatures. Here we usemagnetoresistance to probe both the insulating state at very low temperaturesand the presence of superconducting fluctuations in La_{2-x}Sr_{x}CuO_{4}(LSCO)films, for doping levels that range from the insulator to the superconductor(x=0.03-0.08). We observe that the charge glass behavior, characteristic of theinsulating state, is suppressed with doping, but it coexists withsuperconducting fluctuations that emerge already on the insulating side of theSIT. The unexpected quenching of the superconducting fluctuations by thecompeting charge order at low temperatures provides a new perspective on themechanism for the SIT.

Emergence of superconductivity from the dynamically heterogeneous insulating state in La_{2-x}Sr_{x}CuO_{4}