Transitions between π- and 0-states in superconductor - ferromagnet - superconductor junctions

摘要

Experimental and theoretical study of superconductor (S) - ferromagnet (F) - superconductor junctions showed that in certain range of parameters (e.g., the length of the ferromagnet d_F, the exchange field, E_(ex).) the ground state of the SFS junction corresponds to superconducting phase difference π or 0. The phase diagram of a SFS junction with the respect to π and 0 states is investigated in this letter in E_ex), d_F, T space. It is shown that the phase diagram is very sensitive to the geometry of the system, in particular, to amount of disorder in the junction.