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We propose a theory of strong spin-lattice and spin-phonon coupling in ironpnictides and discuss its implications on superconductivity. Strongmagneto-volume effect in iron compounds has long been known as the Invareffect. Fe pnictides also exhibit this effect, reflected in particular to theatomic volume of Fe defined by the nearest neighbor atoms. Through thephenomenological Landau theory, developed on the basis of the calculations bythe density functional theory (DFT) and the experimental results, we quantifythe strength of the spin-lattice interaction as it relates to the Stonercriterion for the onset of magnetism. We suggest that the coupling betweenelectrons and phonons through the spin channel may be sufficiently strong to bean important part of the superconductivity mechanism in Fe pnictides.

Spin-Phonon Coupling and Superconductivity in Fe Pnictides