Soft elastic constants from phonon spectroscopy in hole-doped Ba${}_{1-x}$(K,Na)${}_x$Fe${}_2$As${}_2$ and Sr${}_{1-x}Na$_x$Fe$_2$As$_2$

M. Kauth, S. Rosenkranz, A. H. Said +3

We report inelastic x-ray scattering measurements of the in-plane polarized transverse acoustic phonon mode propagating along $q\parallel$[100] in various hole-doped compounds belo…