Understanding magnetic instability in gapless superconductors

Details Understanding magnetic instability in gapless superconductors Understanding magnetic instability in gapless superconductors

2005-09-18

arxiv.org/abs/hep-ph/0509177v1

Int.J.Mod.Phys.A21:910-913,2006

Physics

High Energy Physics

High Energy Physics - Phenomenology

Proceeding for the "International Conference on QCD and Hadronic Physics", Jun. 16-20, Beijing, China

Scientific paper

10.1142/S0217751X06032290

Magnetic instability in gapless superconductors still remains as a puzzle. In this article, we point out that the instability might be caused by using BCS theory in mean-field approximation, where the phase fluctuation has been neglected. The mean-field BCS theory describes very well the strongly coherent or rigid superconducting state. With the increase of mismatch between the Fermi surfaces of pairing fermions, the phase fluctuation plays more and more important role, and "soften" the superconductor. The strong phase fluctuation will eventually quantum disorder the superconducting state, and turn the system into a phase-decoherent pseudogap state.

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