Please use this identifier to cite or link to this item: https://apo.ansto.gov.au/dspace/handle/10238/12534
Title: Magnetic structure and spin correlations in magnetoelectric honeycomb Mn4Ta2O9
Authors: Narayanan, N
Senyshyn, A
Mikhailova, D
Faske, T
Lu, T
Liu, Z
Weise, B
Ehrenberg, H
Mole, RA
Hutchison, WD
Fuess, H
McIntyre, GJ
Liu, Y
Yu, DH
Keywords: Spin
Ground states
Specific heat
Neutron diffraction
Inelastic scattering
Electronic structure
Antiferromagnetism
Magnetic moments
Anisotropy
Issue Date: 22-Oct-2018
Publisher: American Physical Society
Citation: Narayanan, N., Senyshyn, A., Mikhailova, D., Faske, T., Lu, T., Liu, Z., Weise, B., Ehrenberg, H., Mole, R. A., Hutchison, W. D., Fuess, H., McIntyre, G. J., Liu, Y., & Yu, D. (2018). Magnetic structure and spin correlations in magnetoelectric honeycomb Mn4Ta2O9. Physical Review B, 98, 134438. doi:10.1103/PhysRevB.98.134438
Abstract: We elucidate the magnetic interactions and the role of spin (electron) correlation in determining the ground state of the honeycomb compound Mn4Ta2O9, by neutron powder diffraction, inelastic neutron scattering (INS), specific-heat (CP) measurements, and electronic-structure calculations. The antiferromagnetic long-range order with moments along c occurs at 102 K with strong exchange striction and small anisotropy. It is escribed by the three-dimensional Ising model. Diffuse magnetic scattering has been observed above TN, which is attributed to the two-dimensional spin correlations within the Mn2+ honeycombs. This is confirmed by the calculated exchange constants. INS experiments and spin-wave simulations together with CP measurements reveal two gapped modes on the ab plane, originating from the rotation of the spins away from the easy axis c. The magnetic anisotropy is mainly determined by an electron-correlation-assisted dipole-dipole interaction. This work provides insight into the competing origins of the magnetic anisotropy, which leads to different magnetic ground states in the family of honeycomb compounds. ©2018 American Physical Society
URI: https://doi.org/10.1103/PhysRevB.98.134438
https://apo.ansto.gov.au/dspace/handle/10238/12534
ISSN: 2469-9969
Appears in Collections:Journal Articles

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