Density of states in layered superconductor-insulator structures
Branko P. Stojković, Oriol T. Valls
DOI 10.1103/PhysRevB.51.3186 · Physical Review B
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Abstract
We study superconductor-insulator layered structures, using a microscopic method based on the Gor’kov 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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Bi2Sr2CaCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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