Synchrotron-Mossbauer study of the pressure-driven magnetic evolution in EuGa<sub>4</sub>

ORAL

Abstract

Rare-earth Eu compounds represent an intriguing class of magnetic materials that provide a competing playground of Kondo physics, RKKY exchange interactions, and valence evolution. Here, we explore the evolution of antiferromagnetism under pressure via synchrotron-based Mossbauer spectroscopy. Contrary to previous electrical transport results, our observation provides direct evidence of a magnetic ground state at high pressure, continuous through a first order phase transition at 5 GPa and persisting to at least 13.6 GPa. We discuss this result in the framework of a potential interaction between evolution of the valence condition and an increase in the ordering temperature.

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Presenters

  • Anjana Krishnadas

    • Okinawa Institute of Science and Technology

Authors

  • Anjana Krishnadas

    • Okinawa Institute of Science and Technology

  • Stephen Armstrong

    • Caltech

  • Wenli Bi

    • APS, Argonne National Lab
    • Advanced Photon Source, Argonne National Laboratory
    • Advanced Photon Source, Argonne National Laboratory, Argonne

  • Jiyong Zhao

    • APS, Argonne National Lab
    • Advanced Photon Source, Argonne National Laboratory, Argonne

  • Esen Alp

    • APS, Argonne National Lab
    • Argonne National Laboratory
    • Advanced Photon Source, Argonne National Laboratory, Argonne

  • Riki Kobayashi

    • University of The Ryukyus

  • Masato Hedo

    • University of The Ryukyus

  • Takao Nakama

    • University of The Ryukyus

  • Yoshichika Onuki

    • University of The Ryukyus

  • Thomas F Rosenbaum

    • Caltech
    • Caltech, Physics, Math & Astronomy
    • California Institute of Technology

  • Yejun Feng

    • Okinawa Institute of Science and Technology
    • Okinawa Institute of Science and Technology Graduate University