The magnetic exchange parameters and anisotropy of the quasi-two dimensional antiferromagnet NiPS$_3$
| Autor: | D. Lançon, F. Formisano, Tatiana Guidi, Andrew Wildes, Russell A. Ewings |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
ni
FOS: Physical sciences mps3 02 engineering and technology Inelastic scattering fe 01 natural sciences Condensed Matter - Strongly Correlated Electrons Lattice (order) 0103 physical sciences Antiferromagnetism order 010306 general physics Anisotropy visualization Physics Condensed Matter - Materials Science model Strongly Correlated Electrons (cond-mat.str-el) Condensed matter physics Magnetic structure Magnon Materials Science (cond-mat.mtrl-sci) 021001 nanoscience & nanotechnology mn Brillouin zone Ferromagnetism Condensed Matter::Strongly Correlated Electrons 0210 nano-technology |
| Zdroj: | Physical Review B (2018). doi:10.1103/PhysRevB.98.134414 info:cnr-pdr/source/autori:Lançon D., Ewings R.A., Guidi T., Formisano F., Wildes A.R./titolo:Magnetic exchange parameters and anisotropy of the quasi-two-dimensional antiferromagnet NiPS3/doi:10.1103%2FPhysRevB.98.134414/rivista:Physical Review B/anno:2018/pagina_da:/pagina_a:/intervallo_pagine:/volume |
| Popis: | Neutron inelastic scattering has been used to measure the magnetic excitations in powdered NiPS$_3$, a quasi-two dimensional antiferromagnet with spin $S = 1$ on a honeycomb lattice. The spectra show clear, dispersive magnons with a $\sim 7$ meV gap at the Brillouin zone center. The data were fitted using a Heisenberg Hamiltonian with a single-ion anisotropy assuming no magnetic exchange between the honeycomb planes. Magnetic exchange interactions up to the third intraplanar nearest-neighbour were required. The fits show robustly that NiPS$_3$ has an easy axis anisotropy with $��= 0.3$ meV and that the third nearest-neighbour has a strong antiferromagnetic exchange of $J_3 = -6.90$ meV. The data can be fitted reasonably well with either $J_1 < 0$ or $J_1 > 0$, however the best quantitative agreement with high-resolution data indicate that the nearest-neighbour interaction is ferromagnetic with $J_1 = 1.9$ meV and that the second nearest-neighbour exchange is small and antiferromagnetic with $J_2 = -0.1$ meV. The dispersion has a minimum in the Brillouin zone corner that is slightly larger than that at the Brillouin zone center, indicating that the magnetic structure of NiPS$_3$ is close to being unstable. 21 pages, 7 figures, 33 references |
| Databáze: | OpenAIRE |
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