Ideally hard superconductor
Encyclopedia
An ideally hard superconductor is a type II superconductor material with an infinite pinning force
(or critical current density). In the external magnetic field it behaves like an ideal diamagnet if the field is switched on when the material is in the superconducting state, so-called "zero field cooled" (ZFC) regime. In the field cooled (FC) regime, the ideally hard superconductor screens perfectly the change of the magnetic field rather than the magnetic field itself. Its magnetization behavior can be described by Bean's critical state model
. The ideally hard superconductor is a good approximation for the melt-textured high temperature superconductors (HTSC) used in large scale HTSC applications such as flywheels, HTSC bearings, HTSC motors, etc.
Pinning force
Pinning force is a force acting on a pinned object from a pinning center. In solid state physics, this most often refers to the vortex pinning, the pinning of the magnetic vortices by different kinds of the defects in a type II superconductor...
(or critical current density). In the external magnetic field it behaves like an ideal diamagnet if the field is switched on when the material is in the superconducting state, so-called "zero field cooled" (ZFC) regime. In the field cooled (FC) regime, the ideally hard superconductor screens perfectly the change of the magnetic field rather than the magnetic field itself. Its magnetization behavior can be described by Bean's critical state model
Bean's critical state model
Bean's critical state model, introduced by C. P. Bean in 1962, gives a macroscopic explanation of the irreversible magnetization behavior of hard Type-II superconductors.-Assumptions:...
. The ideally hard superconductor is a good approximation for the melt-textured high temperature superconductors (HTSC) used in large scale HTSC applications such as flywheels, HTSC bearings, HTSC motors, etc.