Tunneling studies of vortices in high-sheet-resistance granular superconducting films
Shih-Ying Hsu, J. M. Valles, Jr.
DOI 10.1103/PhysRevB.49.6416 · Physical Review B
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Abstract
We have measured the tunneling density of states in ultrathin high-sheet-resistance, 16 Ω<RN<17 kΩ, granular Pb films in perpendicular magnetic fields, H. At the lowest RN, states appear within the superconducting energy gap at low fields (H<0.1 T) indicating the presence of vortex cores. At the highest RN, no states appear in the gap in fields as high as 2 T indicating that the field-induced vortices do not have cores. A simple model implies that the average Josephson coupling energy between the grains of the film is comparable to the condensation energy of a single grain at the RN separating these two regimes.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Pb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Pb 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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