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| Main Authors: | , , , , , , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2024
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2405.15623 |
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| _version_ | 1866913589471739904 |
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| author | Vaidya, S. Hernández-Melián, A. Tidey, J. P. Curley, S. P. M. Sharma, S. Manuel, P. Wang, C. Hannaford, G. L. Blundell, S. J. Manson, Z. E. Manson, J. L. Singleton, J. Lancaster, T. Johnson, R. D. Goddard, P. A. |
| author_facet | Vaidya, S. Hernández-Melián, A. Tidey, J. P. Curley, S. P. M. Sharma, S. Manuel, P. Wang, C. Hannaford, G. L. Blundell, S. J. Manson, Z. E. Manson, J. L. Singleton, J. Lancaster, T. Johnson, R. D. Goddard, P. A. |
| contents | We investigate the magnetic properties of $S=1$ antiferromagnetic diamond lattice, Ni$X_{2}$(pyrimidine)$_{2}$ ($X$ = Cl, Br), hosting a single-ion anisotropy (SIA) orientation which alternates between neighbouring sites. Through neutron diffraction measurements of the $X$ = Cl compound, the ordered state spins are found to align collinearly along a pseudo-easy-axis, a unique direction created by the intersection of two easy planes. Similarities in the magnetization, exhibiting spin-flop transitions, and the magnetic susceptibility in the two compounds imply that the same magnetic structure and a pseudo-easy-axis is also present for $X$ = Br. We estimate the Hamiltonian parameters by combining analytical calculations and Monte-Carlo (MC) simulations of the spin-flop and saturation field. The MC simulations also reveal that the spin-flop transition occurs when the applied field is parallel to the pseudo-easy-axis. Contrary to conventional easy-axis systems, there exist field directions perpendicular to the pseudo-easy-axis for which the magnetic saturation is approached asymptotically and no symmetry-breaking phase transition is observed at finite fields. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2405_15623 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Pseudo-easy-axis anisotropy in antiferromagnetic $S=1$ diamond-lattice systems Ni$X_{2}$(pym)$_{2}$ Vaidya, S. Hernández-Melián, A. Tidey, J. P. Curley, S. P. M. Sharma, S. Manuel, P. Wang, C. Hannaford, G. L. Blundell, S. J. Manson, Z. E. Manson, J. L. Singleton, J. Lancaster, T. Johnson, R. D. Goddard, P. A. Strongly Correlated Electrons We investigate the magnetic properties of $S=1$ antiferromagnetic diamond lattice, Ni$X_{2}$(pyrimidine)$_{2}$ ($X$ = Cl, Br), hosting a single-ion anisotropy (SIA) orientation which alternates between neighbouring sites. Through neutron diffraction measurements of the $X$ = Cl compound, the ordered state spins are found to align collinearly along a pseudo-easy-axis, a unique direction created by the intersection of two easy planes. Similarities in the magnetization, exhibiting spin-flop transitions, and the magnetic susceptibility in the two compounds imply that the same magnetic structure and a pseudo-easy-axis is also present for $X$ = Br. We estimate the Hamiltonian parameters by combining analytical calculations and Monte-Carlo (MC) simulations of the spin-flop and saturation field. The MC simulations also reveal that the spin-flop transition occurs when the applied field is parallel to the pseudo-easy-axis. Contrary to conventional easy-axis systems, there exist field directions perpendicular to the pseudo-easy-axis for which the magnetic saturation is approached asymptotically and no symmetry-breaking phase transition is observed at finite fields. |
| title | Pseudo-easy-axis anisotropy in antiferromagnetic $S=1$ diamond-lattice systems Ni$X_{2}$(pym)$_{2}$ |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2405.15623 |