Magnetic properties of a staggered $S=1$ chain Ni(pym)(H$_{2}$O)$_{2}$(NO$_{3}$)$_{2}$ with an alternating single-ion anisotropy direction

S. Vaidya; S. P. M. Curley; P. Manuel; J. Ross Stewart; M. Duc Le; C. Balz; T. Shiroka; S. J. Blundell; K. A. Wheeler; I. Calderon-Lin; Z. E. Manson; J. L. Manson; J. Singleton; T. Lancaster; R. D. Johnson; P. A. Goddard

doi:10.1103/PhysRevB.111.014421

paper

Magnetic properties of a staggered $S = 1$ chain Ni(pym)(H $_{2}$ O) $_{2}$ (NO $_{3}$ ) $_{2}$ with an alternating single-ion anisotropy direction

arXiv:2407.17894 · doi:10.1103/PhysRevB.111.014421

Abstract

Materials composed of spin-1 antiferromagnetic (AFM) chains are known to adopt complex ground states which are sensitive to the single-ion-anisotropy (SIA) energy ( $D$ ), and intrachain ( $J_{0}$ ) and interchain ( $J_{i}^{'}$ ) exchange energy scales. While theoretical and experimental studies have extended this model to include various other energy scales, the effect of the lack of a common SIA axis is not well explored. Here we investigate the magnetic properties of Ni(pyrimidine)(H $_{2}$ O) $_{2}$ (NO $_{3}$ ) $_{2}$ , a chain compound where the tilting of Ni octahedra leads to a 2-fold alternation of the easy-axis directions along the chain. Muon-spin relaxation measurements indicate a transition to long-range order at $T_{N} = 2.3$ \,K and the magnetic structure is initially determined to be antiferromagnetic and collinear using elastic neutron diffraction experiments. Inelastic neutron scattering measurements were used to find $J_{0} = 5.107 (7)$ \,K, $D = 2.79 (1)$ \,K, $J_{2}^{'} = 0.18 (3)$ \,K and a rhombic anisotropy energy $E = 0.19 (9)$ \,K. Mean-field modelling reveals that the ground state structure hosts spin canting of $ϕ \approx 6. 5^{\circ}$ , which is not detectable above the noise floor of the elastic neutron diffraction data. Monte-Carlo simulation of the powder-averaged magnetization, $M (H)$ , is then used to confirm these Hamiltonian parameters, while single-crystal $M (H)$ simulations provide insight into features observed in the data.

10 pages, 9 figures

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

Magnetic properties of a staggered S=1 chain Ni(pym)(H2​O)2​(NO3​)2​ with an alternating single-ion anisotropy direction

Abstract

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Magnetic properties of a staggered $S = 1$ chain Ni(pym)(H $_{2}$ O) $_{2}$ (NO $_{3}$ ) $_{2}$ with an alternating single-ion anisotropy direction