Phys. Rev. B 66, 140505(R) (2002) [4 pages]Hidden quantum critical point in a ferromagnetic superconductor
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. © 2002 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.66.140505
DOI:
10.1103/PhysRevB.66.140505
PACS:
74.10.+v, 71.10.-w, 71.27.+a, 75.10.Lp
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