Periodic coherence-peak height modulations in superconducting Bi2Sr2CaCu2O8+δ -: art. no. 214514

In this paper we analyze, using scanning tunneling spectroscopy (STS), the local density of electronic states (LDOS) in nearly optimally doped Bi2Sr2CaCu2O8+delta in zero magnetic field. We see both dispersive and nondispersive spatial LDOS modulations as a function of energy in our samples. Moreover, a spatial map of the superconducting coherence peak heights shows the same structure as the low-energy LDOS. This suggests that these nondispersive LDOS modulations originate from an underlying charge-density modulation, which interacts with superconductivity.