Density of states in layered superconductor-insulator structures

Branko P. Stojković, Oriol T. Valls

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


We study superconductor-insulator layered structures, using a microscopic method based on the Gorkov equations. We present our results for the single-particle density of states and the order parameter (OP) as a function of the experimental parameters, such as the insulating barrier strength, the coherence length, and the range of transverse momentum of probes. The results provide a very good fit to the tunneling spectra of Bi2Sr2CaCu2O8, obtained in a soft-point-contact scanning-tunneling microscopy measurement. The results also indicate that the OP in strongly coupled superconducting regions (such as CuO planes in high-temperature superconductors), may be significantly larger than the energy gap found in experiments. The role of all relevant physical and geometrical parameters is also discussed.

Original languageEnglish (US)
Pages (from-to)3186-3194
Number of pages9
JournalPhysical Review B
Issue number5
StatePublished - 1995


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