Magneto Raman spectroscopy of magnons in CoTiO<sub>3</sub> at high magnetic fields

ORAL

Abstract

CoTiO3 is a Dirac honeycomb antiferromagnet with ferromagnetic layers stacked antiferromagnetically. The Co2+ ions are in a d7 configuration that with spin-orbit coupling and a trigonal lattice distortion, leads to effective spin 1/2 moments. In this approximation, we expect that any Hamiltonian with bilinear interactions will lead to gapless excitations. However, experimentally the gap is ~1 meV is observed at the Brillouin zone center. We demonstrate that multi-spin interactions, in the form of ring-exchange among 6 spins, are responsible for the opening of this gap. We do this by studying the magnetic field dependence of the magnons using magneto Raman spectroscopy in magnetic fields up to 22 T. We use a Hamiltonian with the ring exchange and XXZ interactions that reproduces the details of the magnetic field dependence.

*Work at OSU is funded by the Center for Emergent Materials, an NSF MRSEC, under grant DMR-2011876.

–

Publication: arXiv:2212.05278

Presenters

  • Rolando Valdes Aguilar

    • Ohio State University

Authors

  • Rolando Valdes Aguilar

    • Ohio State University

  • YUFEI LI

    • Ohio State University

  • Thuc Mai

    • National Institute of Standards and Technology
    • NIST

  • Mohammed J Karaki

    • Ohio State University
    • Department of Physics, Ohio State University

  • Evan Jasper

    • Ohio State Univ - Columbus

  • Kevin F Garrity

    • National Institute of Standards and Tech

  • Chase L Lyon

    • Ohio State University

  • Daniel Shaw

    • Colorado State University

  • Timothy N DeLazzer

    • Colorado State University

  • Adam J Biacchi

    • National Institute of Standards and Technology (NIST)
    • National Institute of Standards and Technology

  • Rebecca L Dally

    • National Institute of Standards and Technology

  • Daniel M Heligman

    • Ohio State Univ - Columbus

  • Jared Gdanski

    • The Ohio State University

  • Tehseen Adel

    • National Institute of Standards and Technology

  • Maria F Munoz

    • National Institute of Standards and Technologies

  • Alex Giovannone

    • The Ohio State University
    • University of California Santa Barbara

  • Amit Pawbake

    • LNCMI, UPR 3228, CNRS, EMFL, Université Grenoble Alpes

  • Clement Faugeras

    • LNCMI, UPR 3228, CNRS, EMFL, Université Grenoble Alpes

  • Jeffrey R Simpson

    • Towson University

  • Kate A Ross

    • Colorado State University

  • Nandini Trivedi

    • The Ohio State University

  • Yuan-Ming Lu

    • Ohio State Univ - Columbus

  • Angela R Hight Walker

    • National Institute of Standards and Tech
    • National Institute of Standards and Technology