Coexistence of superconductivity and a spin density wave in pnictides: Gap symmetry and nodal lines

Abstract

We investigate the effect of a spin-density wave (SDW) on $s_{\pm }$ superconductivity in Fe-based superconductors. We show that, contrary to the common wisdom, no nodes open at the new, reconnected Fermi surfaces when the hole and electron pockets fold down in the SDW state, despite the fact that the $s_{\pm }$ gap changes sign between the two pockets. Instead, the order parameter preserves its sign along the newly formed Fermi surfaces. The familiar experimental signatures of an $s_{\pm }$ symmetry are still preserved, although they appear in a mathematically different way. For a regular $s$ case ($s_{++})$ the nodes do appear in the SDW state. This distinction suggests a novel simple way to experimentally separate an $s_{\pm }$ state from a regular $s$ in the pnictides. We argue that recently published thermal conductivity data in the coexisting state are consistent with the $s_{\pm },$ but not the $s_{++}$ state.

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• Spin-Density-Wave and Asymmetry of Coherence Peaks in iron-Pnictide Superconductors from a two-orbital model
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• Magnetic resonance from the interplay of frustration and superconductivity
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• Superconducting pairing in the spin-density-wave phase of iron pnictides
• Double magnetic resonance and spin anisotropy in Fe-based superconductors due to static and fluctuating antiferromagnetic orders
• Doping evolution of the superconducting gap structure in the underdoped iron arsenide Ba1-xKxFe2As2 revealed by thermal conductivity
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• Odd-frequency Pairing in the Edge States of Superconducting Pnictides in the Coexistence Phase with Antiferromagnetism
• Coexistence of Antiferromagnetism and Superconductivity in Iron-Based Superconductors
• Interplay between spin density wave and $\pi$ phase shifted superconductivity in the Fe pnictide superconductors
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• Evolution of superconducting gap anisotropy in hole-doped 122 iron pnictides