Question

Differentiate between Type-1 & Type- II Superconductors.

Answer 1

Sr. No.	Type I superconducters	Type II superconductors
1.	They exhibit complete Meissner effect.	They exhibit partial Meissner effect.
2.	There are perfect diamagnetics.	They are not perfect diamagnetics.
3.	These are known as soft superconductors.	They are known as hard superconductors.
4.	They have only one critical magnetic field.	They have two critical magnetic fields.
5.	These material undergo a sharp transition from the superconducting state to the normal state at the critical magnetic field.	These materials undergo a gradual transition from the superconducting state to the normal state between the two critical magnetic fields.
6.	The highest value of critical magnetic field is 0. 1 WB/m2	The upper critical magnetic filed can be of the order of 50 Wb/m2
7.	Application are very limited.	They are used to generate very high magnetic fields.
8.	Examples: Lead, Tin, Mercury, etc	Examples: Alloys like Nb-Sn, Nb-Ti, etc.