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

Elissaios Stavrou, Xiao-Jia Chen, Artem R. Oganov +5

NaFe${}_2$As${}_2$ is investigated experimentally using powder x-ray diffraction and Raman spectroscopy at pressures up to 23 GPa at room temperature and using ab-initio calculations.…