Pressure-dependent intermediate valence behavior in and
- Univ. of California, Davis, CA (United States). Dept. of Physics; Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Argonne National Lab. (ANL), Argonne, IL (United States). HP-CAT. X-ray Science Division
- Univ. of Maryland, College Park, MD (United States). Center for Nanophysics and Advanced Materials. Dept. of Physics
- Florida State Univ., Tallahassee, FL (United States). National High Magnetic Field Lab.
- 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
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