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Title: Pressure-dependent intermediate valence behavior in YbNiGa 4 and YbNiIn 4

Journal Article · · Physical Review B
 [1];  [2];  [3];  [3];  [3];  [3];  [3];  [2];  [2];  [4];  [4];  [5];  [5];  [6];  [2]
  1. Univ. of California, Davis, CA (United States). Dept. of Physics; Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  3. Argonne National Lab. (ANL), Argonne, IL (United States). HP-CAT. X-ray Science Division
  4. Univ. of Maryland, College Park, MD (United States). Center for Nanophysics and Advanced Materials. Dept. of Physics
  5. Florida State Univ., Tallahassee, FL (United States). National High Magnetic Field Lab.
  6. Univ. of California, Davis, CA (United States). Dept. of Physics

We report a comprehensive structural and valence study of the intermediate valent materials YbNiGa4 and YbNiIn4 under pressures up to 60 GPa. YbNiGa4 undergoes a smooth volume contraction and shows steady increase in Yb-valence with pressure, though the Yb-valence reaches saturation around 25 GPa. In YbNiIn4, 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 YbNiIn4 and YbNiGa4 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.

Research Organization:
Energy Frontier Research Centers (EFRC) (United States). Center for Actinide Science & Technology (CAST); Argonne National Laboratory (ANL), Argonne, IL (United States); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); Florida State Univ., Tallahassee, FL (United States); Univ. of Maryland, College Park, MD (United States); Univ. of California, Davis, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Workforce Development for Teachers and Scientists (WDTS); USDOE National Nuclear Security Administration (NNSA); LLNL Laboratory Directed Research and Development (LDRD) Program; National Science Foundation (NSF); Gordon and Betty Moore Foundation (United States)
Grant/Contract Number:
AC02-06CH11357; AC52-07NA27344; SC0016568; SC0014664; DMR-1609855; DMR-1157490; DMR-1644779; GBMF4419
OSTI ID:
1495701
Alternate ID(s):
OSTI ID: 1489083; OSTI ID: 1497304
Report Number(s):
LLNL-JRNL-751141; 150445
Journal Information:
Physical Review B, Vol. 98, Issue 21; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 4 works
Citation information provided by
Web of Science

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