Quantum fluctuations effects on the 1/3-magnetization plateau of Ba<sub>3</sub>CoSb<sub>2</sub>O<sub>9</sub>

ORAL

Abstract

Magnetization plateaux are emerged from the collective quantum phenomena in quantum magnets and have been the focus of intense research over the last decades. After analyzing the ground state of the triangular lattice S = 1/2 antiferromagnet Ba3CoSb2O9 at 0T, we investgate the dynamical properties of the 1/3 magnetization plateau phase under the magnetic field. By measuring the entire structure of the excitation spectrum and revealing excellent agreement with nonlinear spin wave theory, we demonstrate that magnons behave semiclassically in spite of the quantum origin of the underlying magnetic ordering. We also discuss implications of the present result to the elusive zero-field spin dynamics in the same material, which has been recently observed by different groups.

*J.M. acknowledges the support of the Ministry of Science and Technology of China (2016YFA0300500). Y.K. acknowledges the financial support by JSPS Grants-in-Aid for Scientific Research under Grant No. JP16H02206.

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Presenters

  • Jie Ma

    • Physics and Astronomy, Shanghai Jiao Tong University
    • Shanghai Jiao Tong Univ

Authors

  • Jie Ma

    • Physics and Astronomy, Shanghai Jiao Tong University
    • Shanghai Jiao Tong Univ

  • Yoshitomo Kamiya

    • Condensed Matter Laboratory, RIKEN
    • RIKEN
    • iTHES Research Group and Condensed Matter Theory Laboratory, RIKEN

  • Luwei Ge

    • Georgia Institute of Technology

  • Tao Hong

    • Neutron Scattering Division, Oak Ridge National Laboratory
    • Quantum Condensed Matter Division, Oak Ridge National Laboratory
    • Oak Ridge National Lab
    • Oak Ridge National Laboratory
    • Neutron scattering devision, Oak Ridge National Lab

  • Yiming Qiu

    • NIST
    • NIST Center for Neutron Research
    • National Institute of Standards and Technology
    • NIST NCNR

  • Diana L. Quintero Castro

    • University of Stavanger
    • Helmholtz-Zentrum Berlin für Materialien und Energie

  • Huibo Cao

    • Neutron Scattering Division, Oak Ridge National Laboratory
    • Oak Ridge National Laboratory
    • Quantum Condensed Matter Division, Oak Ridge National Laboratory
    • Neutron Sciences Directorate, Oak Ridge National Laboratory
    • Neutron Scattering Division, Oak Ridge National Lab
    • Oak Ridge National Lab
    • Oak Ridge Natl Lab
    • Quantum Condensed Matter Division , Oak Ridge National Laboratory

  • Masaaki Matsuda

    • Oak Ridge National Lab
    • Neutron Scattering Division, Oak Ridge National Laboratory
    • Quantum Condensed Matter Division, Oak Ridge National Lab
    • Oak Ridge National Laboratory

  • Cristian Batista

    • Department of Physics and Astronomy, Univ of Tennessee, Knoxville
    • Univ of Tennessee, Knoxville
    • Department of Physics and Astronomy, The University of Tennessee
    • University of Tennessee
    • Physics, University of Tennessee
    • The University of Tennessee
    • Department of Phys., Univ. of Tennessee
    • U. Tennessee, Knoxville
    • University of Tennessee, Knoxville

  • Martin Mourigal

    • School of Physics, Georgia Inst of Tech
    • School of Physics, Georgia Institute of Technology
    • School of Physics, Georgia Tech
    • Georgia Inst of Tech
    • Georgia Institute of Technology
    • Physics, Georgia Inst of Tech

  • Haidong Zhou

    • Physics and Astronomy, Univ of Tennessee, Knoxville
    • Physics and Astronomy, University of Tennessee Knoxville
    • Department of Physics and Astronomy, University of Tennessee
    • Department of Physics and Astronomy, University of Tennessee Knoxville
    • Department of Physics & Astronomy, University of Tennessee
    • University of Tennessee
    • Physics and Astronomy, University of Tennessee
    • Physics, University of Tennessee
    • Univ of Tennessee, Knoxville
    • Physics and Astronomy, University of Tennessee, knoxville
    • Dept. of Physics and Astronomy, University of Tennessee