52
4 Fundamental Electromagnetic Properties of Superconductors
Fig. 4.1 Magnetization of a type I and b type II superconductors. The broken line in b shows the
behavior of an equivalent type I superconductor, and H c is the thermodynamic critical field
Fig. 4.2 Magnetic flux line
lattice in Pb-1.6wt%Tl
formed by applying 35 mT
above the critical
temperature and then cooling
down to 1.2 K (Courtesy of
Dr. B. Obst)
The magnitude of H c is roughly proportional to the critical temperature T c for all
superconductors, and hence, it does not change very widely. On the other hand, H c2
of a type II superconductor can take on a large value. In particular, H c2 of practical
superconductors is very large, and this is an advantageous property for applications.
The critical temperature and critical fields of various superconductors are listed in
Table 4.1.
4 Fundamental Electromagnetic Properties of Superconductors
Fig. 4.1 Magnetization of a type I and b type II superconductors. The broken line in b shows the
behavior of an equivalent type I superconductor, and H c is the thermodynamic critical field
Fig. 4.2 Magnetic flux line
lattice in Pb-1.6wt%Tl
formed by applying 35 mT
above the critical
temperature and then cooling
down to 1.2 K (Courtesy of
Dr. B. Obst)
The magnitude of H c is roughly proportional to the critical temperature T c for all
superconductors, and hence, it does not change very widely. On the other hand, H c2
of a type II superconductor can take on a large value. In particular, H c2 of practical
superconductors is very large, and this is an advantageous property for applications.
The critical temperature and critical fields of various superconductors are listed in
Table 4.1.