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Effect of Staggered Single-Ion Anisotropy in Non-linear Spin-1 Chains

ORAL · Invited

Abstract

Molecular ligands can be used to synthesize magnetic lattices that are difficult to create using inorganic materials. Examples include non-linear antiferromagnetic chains, in which the orientation of the local environment of the magnetic ion changes from site to site. Spin-1/2 non-linear chains exhibit additional terms in their Hamiltonians as compared to conventional magnets, including non-trivial staggered g-tensors and Dzyalonshinskii-Moriya interactions. On application of an external magnetic field, these energy scales can give rise to staggered fields, field-dependent energy gaps and low-temperature excitation spectra containing both breather and soliton modes [1–3].

Spin-1 AFM chains are known to adopt ground states that differ fundamentally from their spin-1/2 counterparts, an example being the Haldane-gapped phase. Here, we present magnetometry, muon-spin rotation and neutron-scattering data on the newly synthesized spin-1 two-fold staggered chain Ni(pyrimidine)(NO3)2(H2O)2, the four-fold chiral chain [Ni(pyrimidine)(H2O)4]SO4, and the diamond-lattice material NiCl2(pyrimidine)2 [4,5]. The alternating single-ion-anisotropy axis accompanying the alternating local g-tensors, as well as competition between the anisotropy and the exchange along the pyrimidine molecules adds a different level of complexity to these novel quantum magnets.

[1] D. C. Dender et al., Phys. Rev. Lett. 79, 1750 (1997)

[2] S. A. Zvyagin et al., Phys. Rev. Lett. 93, 027201 (2004)

[3] J. Liu et al., Phys. Rev. Lett. 122, 57207 (2019)

[4] S. Vaidya et al., arXiv:2405.15623 (2024)

[5] S. Vaidya et al., arXiv:2407.17894 (2024)

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Publication: [4] Pseudo-easy-axis anisotropy in antiferromagnetic S = 1 diamond-lattice systems<br>S. Vaidya, A. Hernández-Melián, J. P. Tidey, S. P. M. Curley, S. Sharma, P. Manuel, C. Wang, G. L. Hannaford, S. J. Blundell, Z. E. Manson, J. L. Manson, J. Singleton, T. Lancaster, R. D. Johnson, P. A. Goddard, arXiv:2405.15623 (2024)<br><br>[5] Magnetic properties of a staggered S = 1 chain with an alternating single-ion anisotropy direction<br>S. Vaidya, S. P. M. Curley, P. Manuel, J. Ross Stewart, M. Duc Le, T. Shiroka, S. J. Blundell, K. A. Wheeler, Z. E. Manson, J. L. Manson, J. Singleton, T. Lancaster, R. D. Johnson, P. A. Goddard,<br>arXiv:2407.17894 (2024)

Presenters

  • Paul A Goddard

    University of Warwick

Authors

  • Paul A Goddard

    University of Warwick

  • shroya Vaidya

    Birmingham University

  • Roger D Johnson

    University College London

  • Alberto Hernández-Melián

    Durham University

  • John Singleton

    Los Alamos National Laboratory (LANL)

  • Sam Curley

    University of Warwick

  • Sanjay Sharma

    University of Warwick

  • Jeremiah Tidey

    University of Warwick

  • Tom Lancaster

    Durham University

  • Grace Hannaford

    Durham University

  • Stephen Blundell

    University of Oxford

  • Chennan Wang

    Université de Fribourg, 1700 Fribourg, Switzerland, University of Fribourg

  • Toni Shiroka

    Paul Scherrer Institut, Paul Scherrer Institue

  • Pascal Manuel

    ISIS Neutron and Muon Source

  • Ross Stewart

    STFC Rutherford Appleton Laboratory, ISIS Neutron and Muon Source, STFC Rutherford Appleton Laboratory, ISIS Neutron and Muon Facility, Didcot, U.K.

  • M. Duc Le

    ISIS Neutron and Muon Source

  • Zachary E Manson

    Eastern Washington University

  • Kraig Wheeler

    Whitworth University

  • Jamie L Manson

    Eastern Washington University