Experiments exploring the dynamics of KYbSe2 and NaYbSe2 in field near their magnetization plateaux.

ORAL · Invited

Abstract

The AYbSe2 delafossite family is a near perfect realization of a triangular lattice Heisenberg model, with a ratio between the first and second neighbor in-plane exchanges J2/J1 very close to a theoretically predicted quantum spin liquid phase. In this talk I present neutron scattering measurements in zero field and the 1/3 magnetization plateau phase. In this "up-up-down" magnetic ordered phase we find coherent magnons which are describable via nonlinear spin wave theory, and can be fitted to a magnetic exchange model. The fittted J2/J1 of KYbSe2 lies within the 120 degree ordered phase, consistent with other measurements. However, the fitted J2/J1 of NaYbSe2 indicates larger J2/J1, potentially inside the theoretical quantum spin liquid phase, consistent with reports of no magnetic order in NaYbSe2. This indicates that the periodic table can be used to tune the triangular lattice across this phase diagram, and enter the long-sought quantum spin liquid phase in a controlled manner.

* The work was primarily supported by the Quantum Science Center (QSC), a National Quantum Information Science Research Center of the U.S. Department of Energy (DOE). The neutron scattering experiments used resources at the Spallation Neutron Source, a DOE Office of Science User Facility operated by the Oak Ridge National Laboratory. We also acknowledge support from the French Agence Nationale de la Recherche under Grant No. ANR-18-CE30-0022-04 LINK, the U.S. Department of Energy, Basic Energy Sciences, Materials Science and Engineering Division, the U.S. Department of Energy under Grant No. DE-SC0020254, and NSF with Grant No. NSF-DMR-2003117.

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Publication: Scheie, A. O., et al. "Non-linear magnons in the 1/3 magnetization plateau of a proximate quantum spin liquid." arXiv preprint arXiv:2207.14785 (2022).

Presenters

  • Allen O Scheie

    Los Alamos National Laboratory

Authors

  • Allen O Scheie

    Los Alamos National Laboratory

  • Yoshitomo Kamiya

    Shanghai Jiao Tong Univ

  • Hao Zhang

    LANL, Los Alamos National Laboratory

  • Sangyun Lee

    Los Alamos National Laboratory

  • Andrew J Woods

    National High Magnetic Field Lab, Maglab, Los Alamos National Laboratory

  • Ajeesh M Omanakuttan

    Los Alamos National Laboratory

  • Matias G Gonzalez

    Sorbonne Universite

  • Bernard Bernu

    Sorbonne University

  • John W Villanova

    Oak Ridge National Laboratory

  • Jie Xing

    University of South Carolina

  • Qing Huang

    University of Tennessee

  • Qingming Zhang

    Lanzhou University/Institute of Physics

  • Jie Ma

    Shanghai Jiao Tong Univ

  • Eun Sang Choi

    National High Magnetic Field Laboratory, National High Magnetic Field Lab, Tallahassee, Florida, NHMFL, MagLab, Florida State University, National High Magnetic Field Laboratory, Florida State University

  • Daniel M Pajerowski

    Oak Ridge National Lab, Oak Ridge National Laboratory

  • Haidong Zhou

    University of Tennessee

  • Athena S Sefat

    Department of Energy - US

  • Satoshi Okamoto

    Oak Ridge National Laboratory, Oak Ridge National Lab

  • Tom Berlijn

    Oak Ridge National Laboratory

  • Laura Messio

    Sorbonne University

  • Roman Movshovich

    Los Alamos Natl Lab

  • Cristian D Batista

    University of Tennessee

  • David A Tennant

    the University of Tennessee at Knoxville, Oak Ridge National Lab, University of Tennessee, Knoxville, University of Tennessee