Phase diagram in ferromagnetic superconductors

Abstract

In ferromagnetic superconductors, the spin-spiral phase and the self-induced vortex phase have been predicted to be caused by the interplay between the persistent current and the magnetic moments. Along with these two phases, the Meissner phase, the ferromagnetic normal phase, and the paramagnetic normal phase are also expected to appear in the system. From the calculation of the free energies, the phase-diagrams for these phases are obtained in the planes of temperature-the Landau parameter, -magnetization, and -the concentration of magnetic ions.