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Understanding the rich and competing electronic orders in cupratesuperconductors may provide important insight into the mechanism ofhigh-temperature superconductivity. Here, by measuring Bi2Sr2CaCu2O8+x in theextremely underdoped regime, we obtain evidence for a distinct type ofordering, which manifests itself as resistance oscillations at low magneticfields (<10 T) and at temperatures around the superconducting transition. Bytuning the doping level p continuously, we reveal that these low-fieldoscillations occur only when p<0.1. The oscillation amplitude increases withdecreasing p but the oscillation period stays almost constant. We show thatthese low-field oscillations can be well described by assuming a periodicsuperconducting structure with a mesh size of about 50 nm. Such a charge order,which is distinctly different from the well-established charge density wave andpair density wave, seems to be an unexpected piece of the puzzle on thecorrelated physics in cuprates.

Little-Parks like oscillations in lightly doped cuprate superconductors