It is shown that a generic form of an antiferromagnetic wave function opens strong electron-phonon coupling channels in the iron-based superconductors. In the nonmagnetic state these channels exist locally on a single iron atom but are canceled out between the two iron atoms in the primitive unit cell. Our findings are based on symmetry and the presence of an $xz/yz$ Fermi surface near the M point and thus should be relevant for the known iron-based pnictide or chalcogenide superconductors.

• Received 17 December 2015
• Revised 23 August 2016

DOI:https://doi.org/10.1103/PhysRevB.94.104505