Computer simulations on melting phenomena of quantized flux lines in type-II superconductors

摘要

Large scale Monte Carlo simulations are performed in order to clarify thermodynamic properties of vortex states of extremely type-II, layered superconductors. The first-order normal to superconductivity transition is observed accompanied by the melting of the flux-line lattice. If the magnetic field is applied parallel to the layer, there exists a critical field above which the melting becomes continuous. Dynamics of current-driven vortices in a random potential has also been investigated and it is found that for certain currents the moving Bragg glass melts first into moving smectic and then to liquid. [References: 19]