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Single-ion anisotropy driven chiral magnetic order in a spin-1 antiferromagnetic chain

S. Vaidya1,*, S. P. M. Curley1, P. Manuel2, J. Ross Stewart2, M. Duc Le2, A. Hernández-Melián3, T. J. Hicken3,4, C. Wang4, H. Luetkens4 et al.

J. Krieger4, S. J. Blundell5, T. Lancaster3, K. A. Wheeler6, D. Y. Villa7,8, Z. E. Manson7, J. A. Villa7, J. L. Manson7,†, J. Singleton8, R. D. Johnson9,10, and P. A. Goddard1,‡

  • *Contact author: shroya.vaidya@npl.co.uk
  • †Deceased 7 June 2023.
  • ‡Contact author: p.goddard@warwick.ac.uk
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Phys. Rev. B 114, 094402 – Published 3 August, 2026

DOI: https://doi.org/10.1103/2gnf-lrdx

Abstract

Chirality in magnetic systems gives rise to a wide range of exotic phenomena, yet its influence in S=1 chains remains largely unexplored. Herein, we present a comprehensive experimental study of a chiral antiferromagnetic S=1 chain, [Ni(pym)(H2O)4]SO4·H2O (pym = pyrimidine), where the Ni(II) octahedral orientation exhibits a fourfold chiral periodicity. Muon-spin rotation measurements indicate the onset of long-range magnetic order below TN=1.82(1)K. Neutron diffraction measurements reveal a chiral antiferromagnetic order driven by a chiral modulation of the easy-axis anisotropy direction, rather than the typical scenario of Dzyaloshinskii-Moriya interactions, geometrical frustration, or higher-order interactions. Inelastic neutron scattering measurements reveal dispersive spin-wave excitations well described by linear spin-wave theory, with Hamiltonian parameters J0=6.81(1)K (intrachain exchange), J1a′=−0.09(1)K (interchain exchange), and D=−3.02(1)K (easy-axis single-ion anisotropy). These parameters are further validated by Monte Carlo simulations of the magnetization. Additionally, the inelastic neutron scattering data reveal multiple dispersionless bands, suggesting the presence of further excitations beyond the scope of our linear spin-wave theory.

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Phys. Rev. B 114, 094402– Published 3 August, 2026
  • Received 8 September 2025
  • Revised 9 April 2026
  • Accepted 16 June 2026
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