We study in detail, solving the Bogoliubov-de Gennes equations, the magnetic field, supercurrent and order parameter profiles originated by a solenoid or magnetic whisker inserted in a type-II superconductor. We consider solutions of different vorticities, n, in the various cases. The results confirm the connection between the vorticity, the internal currents and the boundstates in a self-consi...

Article history: Received 26 February 2010 Received in revised form 3 July 2010 Accepted 12 July 2010 Available online 16 July 2010

In this laboratory work we will study the vortex lattice VL of a type II superconductor using Small Angle Neutron Scattering SANS. The sample is a single crystal of Nb, a superconductor with a Tc = 9.3 K and lower and upper critical fields of μ0Hc1 = 0.18T and μ0Hc2 = 0.4T, respectively. For external magnetic fields between Hc1 and Hc2 the superconductor is in the so-called intermediate state. ...

Abstract: The world-line formalism is used for the evaluation of the mixed heavy-quark– gluon condensate in two models of QCD – the stochastic vacuum model and the dual superconductor one. Calculations are performed for an arbitrary dimensionality of spacetime d ≥ 2. While in the stochastic vacuum model, the condensate is UV finite up to d = 8, in the dual superconductor model it is UV divergen...

We study theoretically the electronic and transport properties of a diffusive superconductor-normal metal-superconductor (SNS) junction in the presence of a perpendicular magnetic field. We show that the field dependence of the critical current crosses over from the well-known Fraunhofer pattern in wide junctions to a monotonic decay when the width of the normal wire is smaller than the magneti...

Crucially important for application of type-II superconductor films is the stability of the vortex matter--magnetic flux lines penetrating the material. If some vortices get detached from pinning centres, the energy dissipated by their motion will facilitate further depinning, and may trigger a massive electromagnetic breakdown. Up to now, the time-resolved behaviour of these ultra-fast events ...

We study flux penetration in a disordered type II superconductor by simulations of interacting vortices, using a Monte Carlo method for vortex nucleation. Our results show that a detailed description of the nucleation process yields a correction to the scaling laws usually associated with flux front invasion. We propose a simple model to account for these corrections.