Upper critical field in two-band superconductivity
M. Mansor, J. P. Carbotte
DOI 10.1103/PhysRevB.72.024538 · Physical Review B
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Abstract
We use a generalization of the Werthamer-Helfand-Hohenberg equations to strong coupling and to two-band superconductivity to study the dependence of the upper critical field Hc2(T) on anisotropy in the electron-phonon coupling and in the Fermi velocities, as well as on arbitrary values of intraband and interband impurity scattering. For a layered system such as MgB2, the temperature dependence of the critical magnetic (H) field itself and the anisotropy ratio Hc2ab(T)∕Hc2c(T) between ab (H in the basal plane) and c (H perpendicular to the basal plane) directions are studied. For MgB2, the anisotropy ratio is found to be particularly sensitive to intraband impurity scattering in the π band.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 39 | Pressure not reported | unknown |
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