Unconventional pairing in the iron arsenide superconductors

Details Unconventional pairing in the iron arsenide superconductors Unconventional pairing in the iron arsenide superconductors

2009-11-27

arxiv.org/abs/0911.5183v3

Phys. Rev. B 81, 140501(R) (2010)

Physics

Condensed Matter

Superconductivity

3 figures and 4 pages; final version as published.

Scientific paper

We use magnetic long range order as a tool to probe the Cooper pair wave function in the iron arsenide superconductors. We show theoretically that antiferromagnetism and superconductivity can coexist in these materials only if Cooper pairs form an unconventional, sign-changing state. The observation of coexistence in Ba(Fe$_{1-x}$Co$_{x}$)$_{2}$As$_{2}$ then demonstrates unconventional pairing in this material. The detailed agreement between theory and neutron diffraction experiments, in particular for the unusual behavior of the magnetic order below $T_{c}$, demonstrates the robustness of our conclusions. Our findings strongly suggest that superconductivity is unconventional in all members of the iron arsenide family.

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