Nodal Spin Density Wave and band topology of the FeAs based materials

Details Nodal Spin Density Wave and band topology of the FeAs based materials Nodal Spin Density Wave and band topology of the FeAs based materials

2008-05-23

arxiv.org/abs/0805.3535v4

Phys. Rev. B 79, 014505 (2009)

Physics

Condensed Matter

Superconductivity

rewritten for clarity

Scientific paper

10.1103/PhysRevB.79.014505

The recently discovered FeAs-based materials exhibit a $(\pi,0)$ Spin Density Wave (SDW) in the undoped state, which gives way to superconductivity upon doping. Here we show that due to an interesting topological feature of the band structure, the SDW state cannot acquire a full gap. This is demonstrated within the SDW mean-field theory of both a simplified two band model and a more realistic 5-band model. The positions of the nodes are different in the two models and can be used to detected the validity of each model.

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