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Doped Mott insulators have been shown to have a strong propensity to formpatterns of holes and spins often referred to as stripes. In copper-oxides,doping also gives rise to the pseudogap state, which transforms into a hightemperature superconductor with sufficient doping or by reducing thetemperature. A long standing question has been the interplay between pseudogap,which is generic to all hole-doped cuprates, and stripes, whose static formoccurs in only one family of cuprates over a narrow range of the phase diagram.Here we examine the spatial reorganization of electronic states with the onsetof the pseudogap state at T* in the high-temperature superconductorBi2Sr2CaCu2O8+x using spectroscopic mapping with the scanning tunnelingmicroscope (STM). We find that the onset of the pseudogap phase coincides withthe appearance of electronic patterns that have the predicted characteristicsof fluctuating stripes. As expected, the stripe patterns are strongest when thehole concentration in the CuO2 planes is close to 1/8 (per Cu). Whiledemonstrating that the fluctuating stripes emerge with the onset of thepseudogap state and occur over a large part of the cuprate phase diagram, ourexperiments indicate that they are a consequence of pseudogap behavior ratherthan its cause.

Appearance of fluctuating stripes at the onset of the pseudogap in the high-Tc Superconductor Bi2Sr2CaCu2O8+x