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We have studied the C14 hexagonal Laves phase of YbAg$_2$ at normalconditions and under external pressure up to 19 GPa by the time-differentialperturbed angular $\gamma-\gamma$ correlation spectroscopy (TDPAC) using$^{111}$Cd probe nuclei. Under pressure the valence of Yb undergoes a two stagetransition from 2.8 to 3. The two stage scenario is characterized by twodistinct quadrupole frequencies of $^{111}$Cd probes in silver sublattice,monotonically increasing with pressure and saturating at 8 and 16 GPa. Ourexperimental data are compared with the density functional studies of theelectron band structure of YbAg$_2$, whose results are used for discussion andinterpretation of these experiments. We have found that there are two differentelectric field gradients at inequivalent silver sites and that $4d$-states ofsilver participate in metal bonding, allowing for the formation of thehexagonal Laves phase.

physical review. b./physical review. b

Two stage pressure-induced Yb valence change in the Hexagonal Laves  Phase YbAg$_2$: Investigation by time differential perturbed angular  $\gamma$-$\gamma$ correlation spectroscopy method and density functional  calculations