Observation of magnetoelectric, spin-lattice, and electron-phonon coupling in multiferroic (NH<sub>4</sub>)<sub>2</sub>[FeCl<sub>5</sub>(H<sub>2</sub>O)]

ORAL

Abstract

We bring together pulsed-field polarization techniques, magnetoinfrared spectroscopy, and lattice dynamics calculations to uncover the high magnetic field coupling mechanism of polarization and magnetic field in (NH4)2[FeCl5(H2O)] and to explore the structural distortions that this system undergoes through various magnetic phases and across the magnetic quantum phase transition. High-field polarization is quenched by the quasicollinear to collinear sinusoidal magnetic transition. Strikingly, spin-lattice coupling across the magnetic quantum phase transition reveals that nearly all low-frequency vibrations modulate magnetic exchange via hydrogen- and halogen-bonding interactions. An analysis of combined techniques demonstrates that magneto-infrared is sensitive to both spin-phonon and electron-phonon coupling.

–

Presenters

  • Janice Lynn Musfeldt

    • University of Tennessee
    • Department of Chemistry, University of Tennessee, Knoxville
    • Chemistry, University of Tennessee, Knoxville
    • University of Tennessee, Knoxville
    • Chemistry, University of Tennessee, Knoxville, Tennessee, 37996, USA

Authors

  • Kendall Hughey

    • Chemistry, University of Tennessee, Knoxville
    • University of Tennessee, Knoxville

  • Jisoo Nam

    • Ulsan National Institute of Science and Technology

  • Minseong Lee

    • Ulsan National Institute of Science and Technology

  • Amanda Clune

    • Department of Chemistry, University of Tennessee, Knoxville
    • Chemistry, University of Tennessee, Knoxville
    • University of Tennessee, Knoxville

  • Kenneth R O'Neal

    • Chemistry, University of Tennessee, Knoxville
    • University of Tennessee, Knoxville
    • Department of Chemistry, University of Tennessee, Knoxville

  • Avery Blockmon

    • University of Tennessee, Knoxville

  • Wei Tian

    • Oak Ridge National Lab
    • Neutron Scattering Science Division, Oak Ridge National Laboratory
    • Oak Ridge National Laboratory
    • Oak Ridge National Laboratory, Oak Ridge

  • Mykhaylo Ozerov

    • National High Magnetic Field Laboratory, Tallahassee, FL
    • National High Magnetic Field Lab
    • National High Magnetic Field Laboratory
    • Natl High Magnetic Field Lab

  • Vivien Zapf

    • NHMFL, Los Alamos National Laboratory
    • Los Alamos National Laboratory, National High Magnetic Field Laboratory
    • Los Alamos National Laboratory
    • National High Magnetic Field Lab, Los Alamos National Lab
    • Los Alamos Natl Lab

  • Jun Hee Lee

    • Ulsan National Institute of Science and Technology

  • Janice Lynn Musfeldt

    • University of Tennessee
    • Department of Chemistry, University of Tennessee, Knoxville
    • Chemistry, University of Tennessee, Knoxville
    • University of Tennessee, Knoxville
    • Chemistry, University of Tennessee, Knoxville, Tennessee, 37996, USA