Hidden Quantum Critical Point in a Ferromagnetic Superconductor

Details Hidden Quantum Critical Point in a Ferromagnetic Superconductor Hidden Quantum Critical Point in a Ferromagnetic Superconductor

2002-09-10

arxiv.org/abs/cond-mat/0209237v1

Phys. Rev B, 66, 140505(R) (2002)

Physics

Condensed Matter

Superconductivity

4 pages, Phys. Rev. B (Rapid) accepted

Scientific paper

10.1103/PhysRevB.66.140505

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 doesn't. This indicates that the para-Ferro 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 FM phase. The spin wave stiffness remains finite even at the para-Ferro quantum critical point.

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