Title :
A model for Jc in granular A-15 superconductors
Author :
McDonald, Jason ; Barzi, Emanuela
Author_Institution :
Vector Fields Inc., Aurora, IL, USA
fDate :
3/1/2001 12:00:00 AM
Abstract :
The A-15 superconductors, specifically Nb3Sn, appear to be the best candidates for the next generation of high-field accelerator magnets. In order for these materials to be successfully employed in future magnets, a better understanding of their transport and magnetization properties must first be obtained. In this paper, a model is presented for the critical current density JC in a granular A-15 superconductor. The model is based on previous results for Josephson-coupled arrays, and anisotropic flux pinning by grain boundaries. It is shown that, contrary to what has previously been thought, the observed field dependence of JC can be explained without having to invoke a flux-shearing mechanism
Keywords :
critical current density (superconductivity); flux pinning; grain boundaries; granular materials; magnetisation; type II superconductors; Josephson-coupled arrays; Nb3Sn; anisotropic flux pinning; critical current density; flux-shearing mechanism; grain boundaries; granular A-15 superconductors; high-field accelerator magnets; magnetic field dependence; magnetization properties; model; transport properties; Accelerator magnets; Critical current density; Granular superconductors; Magnetic materials; Magnetic properties; Magnetization; Niobium; Superconducting materials; Superconductivity; Tin;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
