Surface Superconductivity of Dirty Two-Band Superconductors: Applications to MgB2
Denis A. Gorokhov
DOI 10.1103/PhysRevLett.94.077004 · Physical Review Letters
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Abstract
The minimal magnetic field Hc2 destroying superconductivity in the bulk of a superconductor is smaller than the magnetic field Hc3 needed to destroy surface superconductivity if the surface of a superconductor coincides with one of the crystallographic planes and is parallel to the external magnetic field. While for a dirty single-band superconductor the ratio of Hc3 to Hc2 is a universal temperature-independent constant 1.6946, for dirty two-band superconductors this is not the case. I show that in the latter case the interaction of the two bands leads to a novel scenario with the ratio Hc3/Hc2 varying with temperature and taking values larger and smaller than 1.6946. The results are applied to MgB2 and compared with recent experiments (A. Rydh et al., cond-mat/0307445).
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. | 40 | Pressure not reported | unknown |
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