Charging effects in coupled superconducting tunnel junctions and their implications for tunneling measurements of high-Tc superconductors
K. Mullen, E. Ben-Jacob, S. Ruggiero
DOI 10.1103/PhysRevB.38.5150 · Physical Review B
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Abstract
We calculate the quasiparticle current for two mesoscopic superconducting tunnel junctions connected in series using the semiclassical model. The I-V characteristics exhibit a sequence of steps whose spacing is determined by the superconducting gap energy and the electrostatic charging energy of the junctions. These steps are reminiscent of those observed in point-contact tunneling experiments performed on granular high-Tc superconductors. We propose that the ‘‘multiple-gap structure’’ observed in such experiments arises from charging effects in a material with a single gap, and suggest experiments to verify this.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 90 | Pressure not reported | unknown |
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