Threshold fluctuations in a superconducting current-carrying bridge

Emergence of dissipative structures in current-carrying superconducting wires.

We discuss the emergence of a spontaneous temperature and critical current spatial modulation in current-carrying high-temperature superconducting wire. The modulation of the critical current along the wire on a scale of 3-10 mm forces a fraction of the transport current to crisscross the resistive interface between the superconducting film and normal metal stabilizer attached to it. This gener...

Gauge fluctuations in superconducting films

In this paper we consider a type-I superconducting film modeled by the Ginzburg-Landau model, confined between two parallel planes a distance L apart from one another. Our approach is based on the Gaussian effective potential in the transverse unitarity gauge, which allows to treat gauge contributions in a compact form. Using techniques from dimensional and ζ-function regularizations, modified ...

Study of Superconducting Fault Current Limiter Device in a AC Railway System

Development of the electric networks led to more interconnection in this system, therefore high level of short circuit faults flows in the networks. Many destructive damages such as instability, insulation problems and voltage mitigation can highly play unwanted influences on the system’s equipment. Using appropriate protection devices like high voltage fuses, fast switches, and such devices...

Nonuniqueness and derivative discontinuities in density-functional theories for current-carrying and superconducting systems

Current-carrying and superconducting systems can be treated within density-functional theory if suitable additional density variables ~the current density and the superconducting order parameter, respectively! are included in the density-functional formalism. Here we show that the corresponding conjugate potentials ~vector and pair potentials, respectively! are not uniquely determined by the de...

Experimental evidence of photo-induced vortex crossing in current carrying superconducting strips