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NaFe$_2$As$_2$ is investigated experimentally using powder x-ray diffractionand Raman spectroscopy at pressures up to 23 GPa at room temperature and usingab-initio calculations. The results reveal a pressure-induced structuralmodification at 4 GPa from the starting tetragonal to a collapsed tetragonalphase. We determined the changes in interatomic distances under pressure thatallowed us to connect the structural changes and superconductivity. Thetransition is related to the formation of interlayer As-As bonds at the expenseof weakening of Fe-As bonds in agreement with recent theoretical predictions.

Formation of As-As Interlayer Bonding in the collapsed tetragonal phase of NaFe$_2$As$_2$ under pressure