Table 1 Summary of the superconducting parameters of very thin Bi-2212 films obtained in this study; Critical temperature \(T_\mathrm{c,inf}\) at the inflection point of the transition, upper critical fields with B oriented perpendicular and parallel to the CuO\(_2\) layers, \(B_{\mathrm{c2}}^{\perp }(0)\) and \(B_{\mathrm{c2}}^{\parallel }(0)\), in-plane and out-of-plane Ginzburg–Landau coherence lengths at zero temperature \(\xi _{ab}\) and \(\xi _{c}\), self-field critical current at 45 K \(J_{\mathrm{c}}^{\mathrm{sf}}(45\,{\mathrm{K}})\), in-plane London penetration depth at zero temperature \(\lambda _{ab}\), anisotropy parameter \(\gamma\), and Ginzburg–Landau parameter \(\kappa\). The uncertainties in the evaluation of these parameters are discussed in the text.
\(T_{\mathrm{c,inf}}\) (K) | \(B_{\mathrm{c2}}^{\perp }(0)\) (T) | \(B_{\mathrm{c2}}^{\parallel }(0)\) (T) | \(\xi _{ab}\) (nm) | \(\xi _{c}\) (nm) | \(J_{\mathrm{c}}^{\mathrm{sf}}(45\,{\mathrm{K}})\) (MA/cm\(^2\)) | \(\lambda _{ab}\) (nm) | \(\gamma\) | \(\kappa\) | |
|---|---|---|---|---|---|---|---|---|---|
Sample A | 90 | 106 | 19,000 | 1.8 | 0.01 | 2.89 | \(\sim 200\) | 180 | \(\sim 113\) |
Sample B | 88 | 86 | – | 2.0 | – | 2.20 | \(\lesssim 240\) | – | \(\lesssim 120\) |
