Why Magnesium Diboride Is Not Described by Anisotropic Ginzburg-Landau Theory
A. E. Koshelev, A. A. Golubov
DOI 10.1103/PhysRevLett.92.107008 · Physical Review Letters
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Abstract
It is well established that the superconductivity in the recently discovered superconducting compound MgB2 resides in the quasi-two-dimensional band (σ band) and three-dimensional band (π band). We demonstrate that, due to such band structure, the anisotropic Ginzburg-Landau theory practically does not have a region of applicability, because gradient expansion in the c direction breaks down. In the case of a dirty π band, we derive the simplest equations, which describe properties of such superconductors near Tc, and explore some consequences of these equations.
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. | — | Pressure not reported | unknown |
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