Physics – Condensed Matter – Superconductivity
Scientific paper
2009-04-05
Some results published in Phys. Lett. A 374, 58 (2009)
Physics
Condensed Matter
Superconductivity
9 pages, 2 figures
Scientific paper
10.1016/j.physleta.2009.10.014
Existence of thermodynamically stable composite vortices in a two-component superconductor may form distinctive vortex patterns, and may lead to type-1.5 superconductivity. Here we study the surface energy of the two-component superconductor and show that the sign of surface energy is determined not only by the Ginzburg-Landau parameters $\kappa_i (i=1,2)$ of two superconducting components, but also by a temperature independent parameter $\kappa_\xi $, which is defined as the ratio of the coherence lengths of two components. Since the negative surface energy conduces to the invasion of thermodynamically stable composite vortices into a superconductor, the criterions for stability of composite vortex are these three independent dimensionless parameters. We find that there can exist thermodynamically stable composite vortex in a type-1+type-2 or type-2+type-2 material. We also predict that unusual vortex patterns like those observed in $MgB_2$ (V. Moshchalkov et al, Phys. Rev. Lett., 102, 117001 (2009)) can occur in some type-2+type-2 superconductors.
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