Observation of magnetoelastic effects in a quasi-one-dimensional spiral magnet

POSTER

Abstract

We present a systematic study of spin and lattice dynamics in the quasi-one-dimensional spiral magnet CuBr2, using Raman scattering in conjunction with infrared and neutron spectroscopy. Along with the development of spin correlations upon cooling, we observe a rich set of broad Raman bands at energies that correspond to phonon-dispersion energies near the one-dimensional magnetic wave vector. The low-energy bands further exhibit a distinct intensity maximum at the spiral magnetic ordering temperature. We attribute these unusual observations to two possible underlying mechanisms: (1) formation of hybrid spin-lattice excitations and/or (2) “quadrumerization” of the lattice caused by spin-singlet entanglement in competition with the spiral magnetism.

*Work at Peking University is supported by NSFC (Grants No. 11374024, No. 11522429, and No. 11174009) and MOST (Grants No. 2013CB921901, No. 2013CB921903, No. 2015CB921302, and No. 2016YFA0301004). The neutron experiment using 4SEASONS at the MLF, J-PARC was performed under a user program (Proposal No. 2014B0032).

Presenters

  • Xiaoqiang Liu

    • Peking University
    • International Center for Quantum Materials, Peking University

Authors

  • Chong Wang

    • Fudan University
    • International Center for Quantum Materials, Peking University

  • Daiwei Yu

    • International Center for Quantum Materials, Peking University

  • Xiaoqiang Liu

    • Peking University
    • International Center for Quantum Materials, Peking University

  • Rongyan Chen

    • International Center for Quantum Materials, Peking University

  • Xinyu Du

    • International Center for Quantum Materials, Peking University

  • Biaoyan Hu

    • International Center for Quantum Materials, Peking University

  • Lichen Wang

    • Internationan Center for Quantum Materials, Peking University
    • International Center for Quantum Materials, Peking University

  • Kazuki Iida

    • Comprehensive Research Organization for Science and Society, Japan
    • Neutron Science and Technology Center, Comprehensive Research Organization for Science and Society (CROSS)
    • Neutron Science and Technology Center, Comprehensive Research Organization for Science and Society

  • Kazuya Kamazawa

    • Comprehensive Research Organization for Science and Society, Japan
    • Neutron Science and Technology Center, Comprehensive Research Organization for Science and Society

  • Shuichi Wakimoto

    • Materials Sciences Research Center, Japan Atomic Energy Agency

  • Ji Feng

    • Peking University
    • International Center for Quantum Materials, Peking University

  • Nan Lin Wang

    • International Center for Quantum Materials, Peking University

  • Yuan Li

    • Internationan Center for Quantum Materials, Peking University
    • Peking University
    • International Center for Quantum Materials, Peking University
    • School of Physics, Peking University