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Orbital character of the spin-reorientation transition in TbMn6Sn6

Author

Listed:
  • S. X. M. Riberolles

    (Ames National Laboratory)

  • Tyler J. Slade

    (Ames National Laboratory
    Iowa State University)

  • R. L. Dally

    (National Institute of Standards and Technology)

  • P. M. Sarte

    (University of California Santa Barbara)

  • Bing Li

    (Iowa State University)

  • Tianxiong Han

    (Iowa State University)

  • H. Lane

    (University of Edinburgh
    Georgia Institute of Technology)

  • C. Stock

    (University of Edinburgh)

  • H. Bhandari

    (George Mason University
    George Mason University)

  • N. J. Ghimire

    (George Mason University
    George Mason University)

  • D. L. Abernathy

    (Oak Ridge National Laboratory)

  • P. C. Canfield

    (Ames National Laboratory
    Iowa State University)

  • J. W. Lynn

    (National Institute of Standards and Technology)

  • B. G. Ueland

    (Ames National Laboratory)

  • R. J. McQueeney

    (Ames National Laboratory
    Iowa State University)

Abstract

Ferromagnetic (FM) order in a two-dimensional kagome layer is predicted to generate a topological Chern insulator without an applied magnetic field. The Chern gap is largest when spin moments point perpendicular to the kagome layer, enabling the capability to switch topological transport properties, such as the quantum anomalous Hall effect, by controlling the spin orientation. In TbMn6Sn6, the uniaxial magnetic anisotropy of the Tb3+ ion is effective at generating the Chern state within the FM Mn kagome layers while a spin-reorientation (SR) transition to easy-plane order above TSR = 310 K provides a mechanism for switching. Here, we use inelastic neutron scattering to provide key insights into the fundamental nature of the SR transition. The observation of two Tb excitations, which are split by the magnetic anisotropy energy, indicates an effective two-state orbital character for the Tb ion, with a uniaxial ground state and an isotropic excited state. The simultaneous observation of both modes below TSR confirms that orbital fluctuations are slow on magnetic and electronic time scales

Suggested Citation

  • S. X. M. Riberolles & Tyler J. Slade & R. L. Dally & P. M. Sarte & Bing Li & Tianxiong Han & H. Lane & C. Stock & H. Bhandari & N. J. Ghimire & D. L. Abernathy & P. C. Canfield & J. W. Lynn & B. G. Ue, 2023. "Orbital character of the spin-reorientation transition in TbMn6Sn6," Nature Communications, Nature, vol. 14(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-38174-5
    DOI: 10.1038/s41467-023-38174-5
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    References listed on IDEAS

    as
    1. Jia-Xin Yin & Biao Lian & M. Zahid Hasan, 2022. "Topological kagome magnets and superconductors," Nature, Nature, vol. 612(7941), pages 647-657, December.
    2. Jia-Xin Yin & Wenlong Ma & Tyler A. Cochran & Xitong Xu & Songtian S. Zhang & Hung-Ju Tien & Nana Shumiya & Guangming Cheng & Kun Jiang & Biao Lian & Zhida Song & Guoqing Chang & Ilya Belopolski & Dan, 2020. "Quantum-limit Chern topological magnetism in TbMn6Sn6," Nature, Nature, vol. 583(7817), pages 533-536, July.
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