Hidden quantum critical point in a ferromagnetic superconductor

Sa, D.

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Hidden quantum critical point in a ferromagnetic superconductor

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Sa, D.
Max Planck Institute for the Physics of Complex Systems, Max Planck Society;

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Citation

Sa, D. (2002). Hidden quantum critical point in a ferromagnetic superconductor. Physical Review B, 66(14): 140505. Retrieved from http://ojps.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=PRBMDO000066000014140505000001&idtype=cvips&gifs=yes.

Cite as: https://hdl.handle.net/11858/00-001M-0000-002B-36CF-5

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.