Analysis of the pseudogap-related structure in tunneling spectra of superconducting Bi2Sr2CaCu2O8+δ revealed by the break-junction technique

The tunnel conductance G(V) for break junctions made of single-crystal as-grown Bi(2)Sr(2)CaCu(2)O(8+delta) samples with T(c)approximate to 86-89 K were measured and clear-cut dip-hump structures (DHSs) were found in the range 80-120 mV of the bias voltage V. A theory of tunneling in symmetrical junctions between inhomogeneous charge-density-wave (CDW) superconductors, considered in the framework of the s-pairing model, has been developed. CDWs have been shown to be responsible for the appearance of the DHS in the tunnel current-voltage characteristics and properly describe the experimental results.