Ginzburg-Landau theory of vortices in a multigap superconductor
M. E. Zhitomirsky, V.-H. Dao
DOI 10.1103/PhysRevB.69.054508 · Physical Review B
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Abstract
The Ginzburg-Landau functional for a two-gap superconductor is derived within the weak-coupling BCS model. The interaction between the two condensates is described by a unique Josephson-type mixing term. The two-gap Ginzburg-Landau theory is then applied to investigate various magnetic properties of MgB2 including an upturn temperature dependence of the transverse upper critical field and a core structure of an isolated vortex. The orientation of vortex lattice relative to crystallographic axes is studied for magnetic fields parallel to the c axis. A peculiar 30° rotation of the vortex lattice with increasing strength of an applied field observed by neutron scattering is attributed to the multigap nature of superconductivity in MgB2.
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 | onset |
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