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From first principles calculations we unravel surprisingly stronginteractions between arsenic ions in iron-pnictides, the strength of which iscontrolled by the Fe-spin state. Reducing the Fe-magnetic moment, weakens theFe-As bonding, and in turn, increases As-As interactions, causing giantreduction in the c-axis. For CaFe$_2$As$_2$ system, this reduction is as largeas 1.4 \AA. Since the large c-reduction has been recently observed only underhigh-pressure\cite{cTphase}, our results suggest that the iron magnetic momentshould be present in Fe-pnictides at all times at ambient pressure. Finally,the conventional electron-phonon coupling in the collapsed phase ofCaFe$_2$As$_2$ gives a maximum $T_c$ of 0.6 K and can not explain the $\sim12$K superconductivity observed in some experiments. Implications of thesefindings on the mechanism of superconductivity in iron-pnictides are discussed.

The Unprecedented Giant Coupling of Fe-spin State and the As-As Hybridization in Iron-Pnictide