Superconducting properties of fractal Nb/Cu multilayers
A. Sidorenko, C. Sürgers, T. Trappmann, H. v. Löhneysen
DOI 10.1103/PhysRevB.53.11751 · Physical Review B
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Abstract
Multilayers of Nb and Cu with a fractal or periodic stacking sequence were prepared by electron-beam evaporation onto sapphire substrates. Their superconductivity was investigated by measurements of Tc and the temperature and angular dependence of the upper critical field Bc2. For low temperatures T≪Tc, all samples show the characteristic behavior of two-dimensional superconductivity independent of the stacking sequence, whereas for temperatures near Tc the type of layering determines the effective dimensionality, resulting in a ‘‘multicrossover’’ behavior in fractal samples. © 1996 The American Physical Society.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 9.34 | Pressure not reported | midpoint |
| Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 8.75 | Pressure not reported | midpoint |
| Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 7.31 | Pressure not reported | midpoint |
| Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 4.98 | Pressure not reported | midpoint |
| PbTe/PbS Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 5.5 | Pressure not reported | unknown |
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