Simple Vortex States in Films of Type-I Ginzburg-Landau Superconductor

Details Simple Vortex States in Films of Type-I Ginzburg-Landau Superconductor Simple Vortex States in Films of Type-I Ginzburg-Landau Superconductor

2010-03-02

arxiv.org/abs/1003.0648v1

Physics

Condensed Matter

Superconductivity

21 pages, 6 figures

Scientific paper

10.1103/PhysRevB.82.214508

Sufficiently thin films of type-I superconductor in a perpendicular magnetic field exhibit a triangular vortex lattice, while thick films develop an intermediate state. To elucidate what happens between these two regimes, precise numerical calculations have been made within Ginzburg-Landau theory at $\kappa=0.5$ and 0.25 for a variety of vortex lattice structures with one flux quantum per unit cell. The phase diagram in the space of mean induction and film thickness includes a narrow wedge in which a square lattice is stable, surrounded by the domain of stability of the triangular lattice at thinner films/lower fields and, on the other side, rectangular lattices with continuously varying aspect ratio. The vortex lattice has an anomalously small shear modulus within and close to the square lattice phase.

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