Generalized critical current density of commercial Nb46.5, Nb50 and Nb53 w/o Ti multifilamentary superconductors

Anomalous superfluid density in quantum critical superconductors.

When a second-order magnetic phase transition is tuned to zero temperature by a nonthermal parameter, quantum fluctuations are critically enhanced, often leading to the emergence of unconventional superconductivity. In these "quantum critical" superconductors it has been widely reported that the normal-state properties above the superconducting transition temperature T(c) often exhibit anomalou...

Enhancement of the critical current density of YBa2Cu3Ox superconductors under hydrostatic pressure.

The dependence of the critical current density Jc on hydrostatic pressure to 0.6 GPa is determined for a single 25 degrees [001]-tilt grain boundary in a bicrystalline ring of nearly optimally doped melt-textured YBa2Cu3Ox. Jc is found to increase rapidly under pressure at +20%/GPa. A new diagnostic method is introduced (pressure-induced Jc relaxation) which reveals a sizable concentration of v...

Effect of sample size on the magnetic critical current density in nano-SiC doped MgB2 superconductors

Sample-size dependence of the magnetic critical current density in MgB2 superconductors

Field and temperature scaling of the critical current density in commercial REBCO coated conductors

Scaling relations describing the electromagnetic behaviour of coated conductors (CCs) greatly simplify the design of REBCO-based devices. The performance of REBCO CCs is strongly influenced by fabrication route, conductor architecture and materials, and these parameters vary from one manufacturer to the others. In the present work we have examined the critical surface for the current density, J...