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Frustrated Magnetic Interactions in an S = 3/2 Bilayer Honeycomb Lattice Compound Bi3Mn4O12(NO3)



M. Matsuda, S. E. Dissanayake, D. L. Abernathy, Yiming Qiu, John R. Copley, N. Kumada, M. Azuma


Inelastic neutron scattering study has been performed in an S=3/2 bilayer honeycomb lattice compound Bi3Mn4O12(NO3) at ambient and high magnetic fields. Relatively broad and monotonically dispersive magnetic excitations were observed at ambient field, where no long range magnetic order exists. In the magnetic field-induced long-range ordered state at 10 T, the magnetic dispersions become slightly more intense, albeit still broad as in the disordered state, and two excitations gaps, probably originating from an easy-plane magnetic anisotropy and intrabilayer interactions, develop. Analyzing the magnetic dispersions using the linear spin-wave theory, we estimated the intraplane and intrabilayer magnetic interactions, which are consistent with those determined by ab initio density functional theory calculations [M. Alaei et al., Phys. Rev. B 96, 140404 (R) (2017)], except the 3rd and 4th neighbor intrabilayer interactions. Most importantly, as predicted by the theory, there is no frustration in the honeycomb plane but frustrating intrabilayer interactions probably give rise to the disordered ground state.
Physical Review B


spin wave, inelastic neutron scattering


Matsuda, M. , Dissanayake, S. , Abernathy, D. , Qiu, Y. , Copley, J. , Kumada, N. and Azuma, M. (2019), Frustrated Magnetic Interactions in an S = 3/2 Bilayer Honeycomb Lattice Compound Bi<sub>3</sub>Mn<sub>4</sub>O<sub>12</sub>(NO<sub>3</sub>), Physical Review B, [online], (Accessed June 21, 2024)


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Created October 21, 2019, Updated October 12, 2021