arXiv Strongly Correlated Electrons
arXiv Strongly Correlated Electrons
Preprint
4 years ago

Spin-waves in 2D honeycomb lattice -type van der Waals antiferromagnet CoPS . (arXiv:2007.11791v1 [cond-mat.mtrl-sci])

Chaebin Kim, Jaehong Jeong, Takatsugu Masuda, Shinichiro Asai, Shinichi Itoh, Heung-Sik Kim, Andrew Wildes, Je-Geun Park
The magnetic excitations in CoPS , a two-dimensional van der Waals (vdW) antiferromagnet with spin on a honeycomb lattice, has been measured using powder inelastic neutron scattering. Clear dispersive spin waves are observed with a large spin gap of ~13 meV. The magnon spectra were fitted using an -type Heisenberg Hamiltonian with a single-ion anisotropy assuming no magnetic exchange between the honeycomb layers. The best-fit parameters show ferromagnetic exchange meV and meV for the nearest and second-nearest neighbors and a sizeable antiferromagnetic exchange meV for the third-nearest neighbor with the strong easy-axis anisotropy meV. The suitable fitting could only be achieved by the anisotropic -type Hamiltonian, in which the exchange interaction for the out-of-plane component is smaller than that for the in-plane one by a ratio . Moreover, the absence of spin-orbit exciton around 30 meV indicates that Co ions in CoPS have a state rather than a spin-orbital entangled ground state. Our result directly shows that CoPS is an experimental realization of the model with a honeycomb lattice in 2D vdW magnets.

Publisher URL: http://arxiv.org/abs/2007.11791

DOI: arXiv:2007.11791v1

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