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
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)

[5] Magnetic properties of a staggered S = 1 chain with an alternating single-ion anisotropy direction
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,
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