Intermediate valence behavior in YbNi(Ga,In)<sub>4</sub>

ORAL

Abstract

Strongly correlated rare-earth materials have been heavily studied because of their rich magnetic behavior which can be tuned via the application of pressure. Intermediate valence compounds are particularly interesting, since pressure can favor either a non-magnetic state, as in Ce-compounds, or a magnetic state, as observed in Yb-compounds. Because the rare-earth valence plays such a crucial role in determining magnetic properties, it is imperative to understand both the underlying physics and how to tailor materials to exhibit the desired valence configuration. With this goal in mind, we have performed a comprehensive structural and valence study of the YbNi(Ga,In)4 system. We have measured the pressure dependence of the Yb-valence up to 42 GPa in YbNiGa4 and up to 27 GPa in YbNiIn4 via x-ray absorption spectroscopy (XAS) and resonant x-ray emission spectroscopy (RXES). Additionally, we have performed x-ray diffraction studies on YbNiGa4 and YbNiIn4 in excess of P = 40 GPa. We successfully tuned the Yb-valence from n = 2.15 in YbNiIn4 to n = 2.6 at P = 42 GPa in YbNiGa4.

*This work was performed under the auspices of the US Department of Energy by LLNL under Contract No. DE-AC52- 07NA27344. This material is based upon work supported by the NSF under Grant Number NSF DMR-1609855.

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Presenters

  • Zachary Brubaker

    • Lawrence Livermore National Lab

Authors

  • Zachary Brubaker

    • Lawrence Livermore National Lab

  • Ryan Stillwell

    • Lawrence Livermore National Lab
    • Condensed Matter and Materials Division, Lawrence Livermore National Laboratory

  • Paul Chow

    • HPCAT, Carnegie Institute of Washington, Argonne National Lab
    • HPCAT

  • Yuming Xiao

    • HPCAT, Carnegie Institute of Washington, Argonne National Lab
    • HPCAT

  • Curtis Kenney-Benson

    • HPCAT, Carnegie Institute of Washington, Argonne National Lab
    • High Pressure Collaborative Access Team, Geophysical Laboratory,Carnegie Institution of Washington

  • Rich Ferry

    • HPCAT, Carnegie Institute of Washington, Argonne National Lab

  • Zsolt Jenei

    • Lawrence Livermore National Lab

  • Scott Donald

    • Lawrence Livermore National Lab

  • Art Nelson

    • Lawrence Livermore National Lab
    • Lawrence Livermore Natl Lab

  • Kevin Huang

    • National High Magnetic Field Lab, Florida State University
    • NHMFL
    • Natl High Magnetic Field Lab
    • NHMFL at Florida State University
    • National HIgh Magnetic Field Lab at Florida State University
    • National High Magnetic Field Lab at Florida State University
    • State Key Laboratory of Surface Physics, Department of Physics, Fudan University

  • Ryan Baumbach

    • National High Magnetic Field Laboratory, Florida State University
    • National High Magnetic Field Lab, Florida State University
    • National High Magnetic Field Laboratory
    • NHMFL
    • National High Magnetic Field Laboratory/Florida State University
    • Natl High Magnetic Field Lab
    • NHMFL at Florida State University

  • Rena Zieve

    • Univ of California - Davis
    • Univ. California - Davis

  • Jason Jeffries

    • Lawrence Livermore National Lab
    • Condensed Matter and Materials Division, Lawrence Livermore National Laboratory
    • LLNL