Abstract
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 that 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.
| Original language | English |
|---|---|
| Article number | 214115 |
| Journal | Physical Review B |
| Volume | 98 |
| Issue number | 21 |
| DOIs | |
| State | Published - Dec 28 2018 |
| Externally published | Yes |
Funding
This work was performed under LDRD (Tracking Code 18-SI-001) and under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory (LLNL) under Contract No. DE-AC52- 07NA27344. Part of the funding was provided through the LLNL Livermore Graduate Scholar Program. Portions of this work were performed at HPCAT (Sector 16), Advanced Photon Source (APS), Argonne National Laboratory. HPCAT operations are supported by DOE-NNSA's Office of Experimental Sciences. The Advanced Photon Source is a U.S. Department of Energy (DOE) Office of Science User Facility operated for the DOE Office of Science by Argonne National Laboratory under Contract No. DE-AC02-06CH11357. Beamtime was generously provided through the GUP system and through CDAC. This material was based upon work supported by the National Science Foundation under Grant No. NSF DMR-1609855. R.E.B. and K.H. performed crystal synthesis experiments at the National High Magnetic Field Laboratory, which is supported by National Science Foundation Cooperative Agreements No. DMR-1157490 and No. DMR-1644779 and the state of Florida. R.E.B. and K.H. were supported in part by the Center for Actinide Science and Technology, an Energy Frontier Research Center funded by the U.S. DOE, Office of Science, BES, under Award No. DE-SC0016568. D.J.C acknowledges support from the U.S. Department of Energy, Office of Science, Office of Workforce Development for Teachers and Scientists, Office of Science Graduate Student Research program, administered by the Oak Ridge Institute for Science and Education for the DOE under Contract No. DESC0014664. J.P. and D.J.C. acknowledge support from the Gordon and Betty Moore Foundation's EPiQS Initiative through Grant No. GBMF4419. This work was performed under LDRD (Tracking Code 18-SI-001) and under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory (LLNL) under Contract No. DE-AC52-07NA27344. Part of the funding was provided through the LLNL Livermore Graduate Scholar Program. Portions of this work were performed at HPCAT (Sector-16), Advanced Photon Source (APS), Argonne National Laboratory. HPCAT operations are supported by DOE-NNSA's Office of Experimental Sciences. The Advanced Photon Source is a U.S. Department of Energy (DOE) Office of Science User Facility operated for the DOE Office of Science by Argonne National Laboratory under Contract No. DE-AC02-06CH11357. Beamtime was generously provided through the GUP system and through CDAC. This material was based upon work supported by the National Science Foundation under Grant No. NSF DMR-1609855. R.E.B. and K.H. performed crystal synthesis experiments at the National High Magnetic Field Laboratory, which is supported by National Science Foundation Cooperative Agreements No. DMR-1157490 and No. DMR-1644779 and the state of Florida. R.E.B. and K.H. were supported in part by the Center for Actinide Science and Technology, an Energy Frontier Research Center funded by the U.S. DOE, Office of Science, BES, under Award No. DE-SC0016568. D.J.C acknowledges support from the U.S. Department of Energy, Office of Science, Office of Workforce Development for Teachers and Scientists, Office of Science Graduate Student Research program, administered by the Oak Ridge Institute for Science and Education for the DOE under Contract No. DESC0014664. J.P. and D.J.C. acknowledge support from the Gordon and Betty Moore Foundation's EPiQS Initiative through Grant No. GBMF4419.
| Funders | Funder number |
|---|---|
| DOE Office of Science | |
| DOE-NNSA's Office of Experimental Sciences | |
| National Science Foundation | DMR-1609855 |
| U.S. DOE | |
| National Science Foundation | DMR-1157490 |
| National Science Foundation | |
| U.S. Department of Energy | |
| Directorate for Mathematical and Physical Sciences | 1157490 |
| Directorate for Mathematical and Physical Sciences | |
| Gordon and Betty Moore Foundation | |
| Office of Science | |
| Basic Energy Sciences | |
| Workforce Development for Teachers and Scientists | |
| Argonne National Laboratory | |
| Lawrence Livermore National Laboratory | |
| Oak Ridge Institute for Science and Education | |
| Laboratory Directed Research and Development | 18-SI-001 |
| Laboratory Directed Research and Development |