TYPES OF SUPER CONDUCTORS



Superconductors are classified into two types as type I and type II superconductors by magnetization behavior.



Type I superconductors

Type I superconductors behave as perfect diamagnetic materials and obey the Meissner effect. Fig 21 shows the relation between the magnetization produced and the applied magnetic field for type I superconductors.

 
 Fig 21 Variation of magnetization (M) with applied magnetic field (H)




A negative sign is introduced in the magnetization value to represent the diamagnetic property of the superconductor. The material produces a repulsive force up to critical field Hc. Therefore it does not allow the magnetic field to penetrate through it. Hence the material behaves as a superconductor. At Hc the repulsive force is zero; the materials behave as a normal conductor and allow the magnetic flux lines to pass through. They are soft superconductors used in coils for superconducting magnets.

Type II superconductors




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