Theory of flux cutting and flux transport at the critical current of a type-II superconducting cylindrical wire
Journal Article
·
· Physical Review. B, Condensed Matter and Materials Physics
I introduce a critical-state theory incorporating both flux cutting and flux transport to calculate the magnetic-field and current-density distributions inside a type-II superconducting cylinder at its critical current in a longitudinal applied magnetic field. The theory is an extension of the elliptic critical-state model introduced by Romero-Salazar and Perez-Rodriguez. The vortex dynamics depend in detail on two nonlinear effective resistivities for flux cutting ({rho}{parallel}) and flux flow ({rho}{perpendicular}), and their ratio r = {rho}{parallel}/{rho}{perpendicular}. When r < 1, the low relative efficiency of flux cutting in reducing the magnitude of the internal magnetic-flux density leads to a paramagnetic longitudinal magnetic moment. As a model for understanding the experimentally observed interrelationship between the critical currents for flux cutting and depinning, I calculate the forces on a helical vortex arc stretched between two pinning centers when the vortex is subjected to a current density of arbitrary angle {phi}. Simultaneous initiation of flux cutting and flux transport occurs at the critical current density J{sub c}({phi}) that makes the vortex arc unstable.
- Research Organization:
- Ames Laboratory (AMES), Ames, IA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- DOE Contract Number:
- AC02-07CH11358
- OSTI ID:
- 1025300
- Report Number(s):
- IS-J 7604
- Journal Information:
- Physical Review. B, Condensed Matter and Materials Physics, Journal Name: Physical Review. B, Condensed Matter and Materials Physics Journal Issue: 21 Vol. 83; ISSN 1098-0121
- Country of Publication:
- United States
- Language:
- English
Similar Records
Theory of flux cutting and flux transport at the critical current of a type-II superconducting cylindrical wire
Theory and experiment testing flux-line cutting physics
Flux-line-cutting and flux-pinning losses in type-II superconductors in rotating magnetic fields
Journal Article
·
Wed Feb 16 23:00:00 EST 2011
· Physical Review. B, Condensed Matter and Materials Physics
·
OSTI ID:1025746
Theory and experiment testing flux-line cutting physics
Journal Article
·
Tue Mar 29 00:00:00 EDT 2011
· Superconductor Science and Technology
·
OSTI ID:1025252
Flux-line-cutting and flux-pinning losses in type-II superconductors in rotating magnetic fields
Journal Article
·
Wed Oct 31 23:00:00 EST 1984
· Phys. Rev. B: Condens. Matter; (United States)
·
OSTI ID:6256876