Properties of strong-coupled superconductors
L. N. Bulaevskii, O. V. Dolgov, M. O. Ptitsyn
DOI 10.1103/PhysRevB.38.11290 · Physical Review B
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Abstract
By use of Eliashberg equations the system of electrons and phonons with the Einstein spectrum α2(ω)F(ω)=(λΩ/2)δ(ω-Ω) is studied. The orbital and paramagnetic upper critical magnetic fields are obtained in the case of strong electron-phonon coupling λ (including λ≫1). For λ≫1, superconducting parameters at very low temperatures differ remarkably from those near Tc; the crossover takes place at a temperature corresponding to the phonon frequency Ω. For λ≳4, at temperatures below about Ω/3 the superconducting correlation length decreases, giving the positive curvature in the temperature dependence of the upper critical field. The coefficients of the Ginzburg-Landau functional are calculated. The absolute value of the specific-heat jump grows with λ while its relative value drops. For λ≳4, the resistivity above Tc increases linearly with temperature.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| (BEDT-TTF)2I3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 8 | Pressure not reported | unknown |
| (BEDT-TTF)2AuI2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 5 | Pressure not reported | unknown |
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