# Type I and Type II superconductors

Depending upon their behavior in an external magnetic field, superconductors are divided into two types:

a) Type I superconductors and b) Type II superconductors

Let us discuss them one by one:

1) Type I superconductors:

a). Type I superconductors are those superconductors which loose their superconductivity very easily or abruptly when placed in the external magnetic field. As you can see from the graph of intensity of magnetization (M) versus applied magnetic field (H), when the Type I superconductor is placed in the magnetic field, it suddenly or easily looses its superconductivity at critical magnetic field (Hc) (point A).

After Hc, the Type I superconductor will become conductor.

b). Type I superconductors are also known as soft superconductors because of this reason that is they loose their superconductivity easily.

c) Type I superconductors perfectly obey Meissner effect.

d) Example of Type I superconductors: Aluminum (Hc = 0.0105 Tesla), Zinc (Hc = 0.0054)

2) Type II superconductors:

a). Type II superconductors are those superconductors which loose their superconductivity gradually but not easily or abruptly when placed in the external magnetic field. As you can see from the graph of intensity of magnetization (M) versus applied magnetic field (H), when the Type II superconductor is placed in the magnetic field, it gradually looses its superconductivity. Type II superconductors start to loose their superconductivity at lower critical magnetic field (Hc1) and completely loose their superconductivity at upper critical magnetic field (Hc2).

b) The state between the lower critical magnetic field (Hc1) and upper critical magnetic field (Hc2) is known as vortex state or intermediate state.

After Hc2, the Type II superconductor will become conductor.

c). Type II superconductors are also known as hard superconductors because of this reason that is they loose their superconductivity gradually but not easily.

c) Type II superconductors obey Meissner effect but not completely.

d) Example of Type II superconductors: NbN (Hc = 8 x 106 Tesla), Babi3 (Hc = 59 x 103 Tesla)

e) Application of Type II superconductors: Type II superconductors are used for strong field superconducting magnets.

### 11 Responses to Type I and Type II superconductors

1. Pingback: Applications of superconductors

2. keneth says:

there is a simple mistake on the last part of type II superconductors
you are still writing that type one yet we on type II already
but it great stuff

• amsh says:

Thanks for the pointing the mistake. I have corrected it now.

3. Aadish Rahman says:

Hi, I am a student, can I use the information for a presentation and seminar in my college.

• amsh says:

yes, you can use but give the reference of our website.

4. sabo khan says:

hey i m a student..can i know about your reference for this type 1 and type 2 superconductor…actually i write it in my thesis …

• amsh says:

You can reference of this website.

5. sabo khan says:

Plz can you give me some answers about properties of superconductors..???if yes then i well ask it…

• amsh says:

Please ask.

6. sabo khan says:

which properties change with superconductors..??
and why..??

7. sabo khan says:

i m so confused bcz after one month wl be my presentation about my project plzz give me answer..