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

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arxiv 0805.3535 v4 pith:NB6CDAUA submitted 2008-05-23 cond-mat.supr-con cond-mat.str-el

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

classification cond-mat.supr-con cond-mat.str-el
keywords bandmodeldensitymaterialsspinstatewaveacquire
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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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