54
4 Fundamental Electromagnetic Properties of Superconductors
Table. 4.1
Critical temperatures and critical fields at 0 K for various superconductors. In some superconductors H
c1
(0) cannot be measured because of the
influence of flux pinning, and/or the value of H
c2
(0) is different depending on the direction of the magnetic field due to anisotropy
Type
Superconductor
T
c (K)
μ 0 H
c
(0) (mT)
μ 0 H
c1
(0) (mT)
μ 0 H
c2
(0) (T)
I
Hg(α)
4.15
41
In
3.41
28
Pb
7.20
80
Ta
4.47
83
II
Nb
9.25
199
174
0.404
Nb
37 Ti
63
9.08
253
15
Nb
3 Sn
18.3
530
29
Nb
3 Al
18.6
33
PbMo
6 S
8
15.3
60
MgB
2
39
SmFeAsO
1-x F
x
57.5
YBa
2 Cu
3 O
7-δ
93
(Bi,Pb)
2 Sr
2 Ca
2 Cu
3 O
x
115
HgBa
2 Ca
2 Cu
3 O
x
138
820
4 Fundamental Electromagnetic Properties of Superconductors
Table. 4.1
Critical temperatures and critical fields at 0 K for various superconductors. In some superconductors H
c1
(0) cannot be measured because of the
influence of flux pinning, and/or the value of H
c2
(0) is different depending on the direction of the magnetic field due to anisotropy
Type
Superconductor
T
c (K)
μ 0 H
c
(0) (mT)
μ 0 H
c1
(0) (mT)
μ 0 H
c2
(0) (T)
I
Hg(α)
4.15
41
In
3.41
28
Pb
7.20
80
Ta
4.47
83
II
Nb
9.25
199
174
0.404
Nb
37 Ti
63
9.08
253
15
Nb
3 Sn
18.3
530
29
Nb
3 Al
18.6
33
PbMo
6 S
8
15.3
60
MgB
2
39
SmFeAsO
1-x F
x
57.5
YBa
2 Cu
3 O
7-δ
93
(Bi,Pb)
2 Sr
2 Ca
2 Cu
3 O
x
115
HgBa
2 Ca
2 Cu
3 O
x
138
820