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  • Letter
  • Open Access

Magnetic ground state of the Kitaev Na2Co2TeO6 spin liquid candidate

Weiliang Yao1,*, Yang Zhao2,3, Yiming Qiu2, Christian Balz4, J. Ross Stewart4, Jeffrey W. Lynn2, and Yuan Li1,5,†

  • 1International Center for Quantum Materials, School of Physics, Peking University, Beijing 100871, China
  • 2NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA
  • 3Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742, USA
  • 4ISIS Neutron and Muon Source, STFC Rutherford Appleton Laboratory, Didcot OX11 0QX, United Kingdom
  • 5Collaborative Innovation Center of Quantum Matter, Beijing 100871, China

  • *weiliangyao@outlook.com; Present address: Department of Physics and Astronomy, Rice University, Houston, TX 77005, USA.
  • †yuan.li@pku.edu.cn
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Phys. Rev. Research 5, L022045 – Published 2 June, 2023

DOI: https://doi.org/10.1103/PhysRevResearch.5.L022045

Abstract

As a candidate Kitaev material, Na2Co2TeO6 exhibits intriguing magnetism on a honeycomb lattice that is believed to be C3 symmetric. Here we report a neutron diffraction study of high-quality single crystals under a-axis magnetic fields. Our data support the less common notion of a magnetic ground state that corresponds to a triple-q magnetic structure with C3 symmetry, rather than the multidomain zigzag structure typically assumed in prototype Kitaev spin liquid candidates. In particular, we find that the field is unable to repopulate the supposed zigzag domains, where the only alternative explanation is that the domains are strongly pinned by hitherto unidentified structural reasons. If the triple-q structure is correct, then this requires reevaluation of many candidate Kitaev materials. We also find that fields beyond about 10 Tesla suppress the long-range antiferromagnetic order, allowing magnetic behavior to emerge different from that expected for a spin liquid.

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Phys. Rev. Research 5, L022045– Published 2 June, 2023
  • Received 11 December 2022
  • Revised 23 March 2023
  • Accepted 11 May 2023
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