Abstract
The electromagnetic interaction between the persistent current and the rare earth magnetic moments plays an important role for superconducting and magnetic properties in the rare earth ternary superconductors. In the superconducting state of ferromagnetic superconductors, the screening of the spin-spin interaction due to the persistent current causes a spin-spiral order, or a spin-sinusoidal order in the presence of magnetocrystalline anisotropy. The rare earth magnetization influences the flux-quantization condition and gives rise to the strong attractive force between the vortices which changes the type II/2 superconductor to a type II/1 or a type I superconductor near the magnetic phase transition temperature. Under some conditions, the interplay between the magnetic field induced by the persistent current and the rare earth magnetic moments stabilizes the self-induced vortex state, and the self-induced laminar state. The thermal and magnetic behavior of the laminar state resembles that of the periodic state found in ErRh4B4 and HoMo6S8. The anomalous temperature dependence of Hc2 in antiferromagnetic superconductors is also discussed.
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