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We report a comprehensive structural and valence study of the intermediatevalent materials YbNiGa$_{4}$ and YbNiIn$_{4}$ under pressures up to 60 GPa.YbNiGa$_{4}$ undergoes a smooth volume contraction and shows steady increase inYb-valence with pressure, though the Yb-valence reaches saturation around 25GPa. In YbNiIn$_{4}$, a change in pressure dependence of the volume and a peakin Yb-valence suggest a pressure induced electronic topological transitionoccurs around 10-14 GPa. In the pressure region where YbNiIn$_{4}$ andYbNiGa$_{4}$ possess similar Yb-Yb spacings the Yb-valence reveals aprecipitous drop. This drop is not captured by density-functional-theorycalculations and implies that both the lattice degrees of freedom and thechemical environment play an important role in establishing the valence of Yb.

Pressure dependent intermediate valence behavior in YbNiGa$_{4}$ and YbNiIn$_{4}$