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

  • Author(s): Brubaker, ZE
  • Stillwell, RL
  • Chow, P
  • Xiao, Y
  • Kenney-Benson, C
  • Ferry, R
  • Popov, D
  • Donald, SB
  • Söderlind, P
  • Campbell, DJ
  • Paglione, J
  • Huang, K
  • Baumbach, RE
  • Zieve, RJ
  • Jeffries, JR
  • et al.
Abstract

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

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