Upper critical field for a high-Tc electron-phonon superconductor: Regime of Tcω1n∼1
F. Marsiglio, J. P. Carbotte
DOI 10.1103/PhysRevB.36.3633 · Physical Review B
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Abstract
We have calculated the upper critical field Hc2 for an electron-phonon superconductor in the limit when the critical temperature Tc is of the same order as a typical phonon energy ω1n. This extends well beyond the conventional range for which Tcω1n≲0.25. In this very-strong-coupling regime, the strong-coupling corrections to Hc2 are found to be much less than one, in sharp contrast to the usual case for which they are invariably greater than one. On the other hand, the value of the reduced critical field hc2 at zero temperature can be larger than in Bardeen-Cooper-Schrieffer theory by more than a factor of 3. Also, as a function of reduced temperature (t), hc2(t) displays an unusual positive curvature for t in the middle of its range and hc2(0) acquires a very strong impurity dependence.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| La1.85Sr0.15CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 36 | Pressure not reported | unknown |
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