Two-dimensional vortex lattice melting

Two-dimensional vortex lattice melting.

We report on a Monte-Carlo study of two-dimensional Ginzburg-Landau superconductors in a magnetic field which finds clear evidence for a firstorder phase transition characterized by broken translational symmetry of the superfluid density. A key aspect of our study is the introduction of a quantity proportional to the Fourier transform of the superfluid density which can be sampled efficiently i...

Quantum melting of a two-dimensional vortex lattice at zero temperature.

We consider the quantum melting of a two-dimensional flux lattice at temperature T 5 0 in the ‘‘superclean limit.’’ In this regime, we find that vortex motion is dominated by the Magnus force. A Lindemann criterion predicts melting when nv /np>b , where nv and np are the areal number densities of vortex pancakes and Cooper pairs, and b'0.1. A second criterion is derived by using Wigner-crystal ...

NMR and Vortex Lattice Melting in YBa2Cu3O7

Fundamental and vortex solitons in a two-dimensional optical lattice.

Fundamental and vortex solitons in a two-dimensional optically induced waveguide array are reported. In the strong localization regime the fundamental soliton is largely confined to one lattice site, whereas the vortex state comprises four fundamental modes superimposed in a square configuration with a phase structure that is topologically equivalent to the conventional vortex. However, in the ...

Vortex Lattice Depinning vs. Vortex Lattice Melting: a pinning-based explanation of the equilibrium magnetization jump

In this communication we argue that the Vortex Lattice Melting scenario fails to explain several key experimental results published in the literature. From a careful analysis of these results we conclude that the Flux Line Lattice (FLL) does not melt along a materialand sample-dependent boundary Hj(T ) but the opposite, it de-couples from the superconducting matrix becoming more ordered. When t...