Critical temperature of MgB2 ultrathin superconducting films: BCS model calculations in the tight-binding approximation
Karol Szałowski
DOI 10.1103/PhysRevB.74.094501 · Physical Review B
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Abstract
We develop the multiband BCS model of superconductivity in the ultrathin films using the orthogonal tight-binding approximation for constructing the electron wave functions. This allows for relatively simple determination of the band structure near the Fermi level as well as the electron-electron interaction matrix elements of the BCS type. The model is applied to the ultrathin MgB2(0001) films, for which the critical temperature values are calculated in the thickness range 2–10MgB2 layers. The importance of the boundary conditions is emphasized, as either boron or magnesium layers may cover the film. It is found that films thinner than four layers show a substantial decrease in the critical temperature. The charge spillage outside the geometric boundaries of the film, which is allowed in our model, supresses Tc oscillations and weakens its dependence on film covering layer composition.
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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