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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.

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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