Three-Dimensional Magnetism and the Dzyaloshinskii-Moriya Interaction in S=3/2 Kagome Staircase Co3V2O8
Joel Helton, Nicholas P. Butch, Daniel M. Pajerowski, Sergei N. Barilo, Jeffrey W. Lynn
Time-of-flight neutron spectroscopy reveals spin waves in the ferromagnetic ground state of the kagome staircase material Co32V2O8. While previous work has treated this material as quasi-two-dimensional we find an inherently three-dimensional spin Hamiltonian. A model of ferromagnetic first, third, and fourth-nearest neighbor interactions and an antiferromagnetic twelfth-nearest neighbor interactions and an antiferromagnetic twelfth-nearest neighbor interaction describes the spin wave spectrum throughout reciprocal space. The spin wave branches show gaps that point to a signification Dzyaloshinskii-Moriya interaction on the nearest-neighbor bond, with D1≥J1/2. A better understanding of the Dzyaloshinskii-Moriya interaction in this material could shed light on the multiferroicity of the structurally similar Nid3^V2O8. At a higher temperature where Co3V2O8 displays an antiferromagnetic spin density wave structure there are no well-defined spin wave excitations, with most of the spectral weight observed in broad diffuse scattering centered at the (0, 0.5, 0) antiferromagnetic Bragg peak.
, Butch, N.
, , D.
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and Lynn, J.
Three-Dimensional Magnetism and the Dzyaloshinskii-Moriya Interaction in S=3/2 Kagome Staircase Co<sub>3</sub>V<sub>2</sub>O<sub>8</sub>, Science Advances, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=928576
(Accessed September 26, 2023)