Upper bound on the ratio of Ginzburg-Landau parameters κ2/κ for layered superconductors near Tc
J. Rammer
DOI 10.1103/PhysRevB.43.2983 · Physical Review B
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Abstract
The slope of the generalized Ginzburg-Landau parameter κ2(T) at Tc is calculated in the clean limit using Eliashberg’s strong-coupling theory. Fermi surfaces rotationally invariant about the magnetic-field axis are considered, and specific results are presented for the spherical and the cylindrical case. For a given Fermi surface, an upper bound on the normalized κ2 slope is found for a coupling strength Tc/〈ω〉≃0.16, where 〈ω〉 is a characteristic frequency in the coupling function. The maximum enhancement factor relative to the weak-coupling value is of the order 1.5. Finally, it is found that, for very strong coupling, Tc/〈ω〉≳0.4, the slope in κ2 changes sign.
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. | 91.5 | Pressure not reported | onset |
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