STM studies of near-optimal doped Bi2Sr2CaCu2O8+δ

In this paper, we summarize our Scanning Tunnelling Microscope (STM) studies of the density of electronic states in nearly optimally doped Bi2Sr2CaCu2O8+δ in zero field. We report on the inhomogeneity of the gap structure, density of states modulations with four-lattice constant period, and coherence peak modulation.