Vortex Sublattice Melting in a Two-Component Superconductor

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...

Flux quantization for a vortex in two-gap superconductor

Contrary to recent theoretical prediction, we show that the magnetic flux of a vortex in SU(2) model of two-gap superconductor is quantized in units of 2π/g, not 4π/g. For the U(1) version of this model, the flux is quantized in units of 2πα/g where 0 < α < 1. The parameter α depends on the masses and concentrations of the Cooper pairs in the two condensates. PACS number(s): 74.20.De, 74.25.Qt,...

Vortex-Glass Melting Transition and Scaling Behavior in the Cuprate Superconductor Nd2-xCexCuOy at Low Temperatures

Features of the melting dynamics of a vortex lattice in a high-Tc superconductor in the presence of pinning centers

The phase transition ‘‘triangular lattice–vortex liquid’’ in layered highTc superconductors in the presence of pinning centers is studied. A two-dimensional system of vortices simulating the superconducting layers in a high-Tc Shubnikov phase is calculated by the Monte Carlo method. It was found that in the presence of defects the melting of the vortex lattice proceeds in two stages: First, the...

Vortex lines in topological insulator-superconductor heterostructures

Ching-Kai Chiu,1 Matthew J. Gilbert,2,3 and Taylor L. Hughes1 1Department of Physics, University of Illinois, 1110 West Green Street, Urbana, Illinois 61801, USA 2Department of Electrical and Computer Engineering, University of Illinois, 1406 West Green Street, Urbana, Illinois 61801, USA 3Micro and Nanotechnology Laboratory, University of Illinois, 208 North Wright Street, Urbana, Illinois 618...