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MPIPKS:
Phase transitions and critical phenomena
Abstract:
We consider a coexistence phase of both ferromagnetism and superconductivity and solve the self-consistent mean-field equations at zero temperature. The superconducting gap is shown to vanish at the Stoner point whereas the magnetization does not. This indicates that the paramagnetic-ferromagnetic quantum critical point becomes a hidden critical point. The effective mass in such a phase gets enhanced whereas the spin-wave stiffness is reduced as compared to the pure ferromagnetic phase. The spin-wave stiffness remains finite even at the paramagnetic-ferromagnetic quantum critical point.
