Interplay between magnetism and superconductivity in Fe-pnictides

Abstract

We consider phase transitions and potential co-existence of spin-density-wave (SDW) magnetic order and extended s-wave ($s^{+}$) superconducting order within a two-band itinerant model of iron pnictides, in which SDW magnetism and $s^{+}$ superconductivity are competing orders. We show that depending on parameters, the transition between these two states is either first order, or involves an intermediate phase in which the two orders co-exist. We demonstrate that such co-existence is possible when SDW order is incommensurate.

5 pages, 3 figures

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• Structural and magnetic phase diagram of CeFeAsO1-xFx and its relationship to high-temperature superconductivity
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Cited by in corpus (5)

• Momentum dependence and nodes of the superconducting gap in iron-pnictides
• NMR investigation of superconductivity and antiferromagnetism in CaFe${}_2$As${}_2$ under pressure
• Theory of Raman response in a superconductor with extended s-wave symmetry: Application to Fe-pnictides
• Excitonic spin density wave state in iron pnictides
• Vortex state in iron-based superconductors with collinear antiferromagnetic cores