Charge-density-wave origin of the dip-hump structure in tunnel spectra of the BSCCO superconductor (original) (raw)

Differential conductance G as the function of the bias voltage V across the tunnel junction between a normal metal and an inhomogeneous superconductor with charge density waves ͑CDW's͒ has been calculated by spatial averaging over random domains with varying superconducting-and normal-state properties. For these materials, irregularly distorted CDW patterns with spatially scattered values of various parameters were earlier shown to manifest themselves in a great body of experimental data. The results of the calculations were applied to explain the well-known dip-hump structure in the G͑V͒ dependence for Bi 2 Sr 2 CaCu 2 O 8+␦ and other high-T c cuprates.