Giant vortices in the Ginzburg-Landau description of superconductivity

Details Giant vortices in the Ginzburg-Landau description of superconductivity Giant vortices in the Ginzburg-Landau description of superconductivity

2001-12-21

arxiv.org/abs/cond-mat/0112413v1

Phys.Rev.B 64, 134512 (2001)

Physics

Condensed Matter

Superconductivity

35 pages, 10 figures

Scientific paper

10.1103/PhysRevB.64.134512

Recent experiments on mesoscopic samples and theoretical considerations lead us to analyze multiply charged ($n>1$) vortex solutions of the Ginzburg-Landau equations for arbitrary values of the Landau-Ginzburg parameter $\kappa$. For $n\gg 1$, they have a simple structure and a free energy ${\cal F}\sim n$. In order to relate this behaviour to the classic Abrikosov result ${\cal F}\sim n^2$ when $\kappa\to +\infty$, we consider the limit where both $n\gg 1$ and $\kappa\gg1$, and obtain a scaling function of the variable $\kappa/n$ that describes the cross-over between these two behaviours of ${\cal F}$. It is then shown that a small-n expansion can also be performed and the first two terms of this expansion are calculated. Finally, large and small n expansions are given for recently computed phenomenological exponents characterizing the free energy growth with $\kappa$ of a giant vortex.

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