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A Spin Hamiltonian for BaCdVO(PO4) 2



V. K. Bhartiya, S. Hayashida, K. Yu. Povarov, Z. Yan, Yiming Qiu, S. Raymond, A. Zheludev


Single crystal inelastic neutron scattering is used to study spin wave excitations in the fully polarized state of the frustrated quantum ferro-antiferromagnet BaCdVO(PO4) 2. The data analysis is based on a Heisenberg spin Hamiltonian that includes as many distinct nearest-neighbor and next-nearest neighbor interactions as allowed by crystal symmetry. All 8 such exchange constants are obtained in a simultaneous fit to over 150 scans across the dispersion manifold. This establishes a definitive quantitative model of this material. It turns out to be substantially different from the one assumed in numerous previous studies based on powder experiments.
Physical Review B


spin nematic phase, hamiltonian, neutron scattering


Bhartiya, V. , Hayashida, S. , Povarov, K. , Yan, Z. , Qiu, Y. , Raymond, S. and Zheludev, A. (2021), A Spin Hamiltonian for BaCdVO(PO<sub>4</sub>) <sub>2</sub>, Physical Review B (Accessed May 28, 2024)


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Created April 1, 2021, Updated November 29, 2022