The Magnetic Properties Of Superconductors

The magnetic properties of superconductors: In addition to the loss of resistance, superconductors prevent external magnetic field from penetrating the interior of the superconductor. This expulsion of external magnetic fields takes place for magnetic fields that are less than the critical field. Magnetic field greater than BC destroys the superconductive state.

Critical magnetic field: The critical magnetic field depends upon the temperature,

B_C0 = critical magnetic field at T=0.

Relationship between resistivity (a), magnetic field inside the superconductive material (b) and magnetization of superconductor as a function of external magnetic field