Magnetic structure and spin correlations in magnetoelectric honeycomb M n4 T a2 O9

N. Narayanan; A. Senyshyn; D. Mikhailova; T. Faske; T. Lu; Z. Liu; B. Weise; H. Ehrenberg; R. A. Mole; W. D. Hutchison; H. Fuess; G. J. McIntyre; Y. Liu; D. Yu

doi:10.1103/PhysRevB.98.134438

Magnetic structure and spin correlations in magnetoelectric honeycomb M n4 T a2 O9

N. Narayanan, A. Senyshyn, D. Mikhailova, T. Faske, T. Lu, Z. Liu, B. Weise, H. Ehrenberg, R. A. Mole, W. D. Hutchison, H. Fuess, G. J. McIntyre, Y. Liu, D. Yu

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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 described 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.

Original language	English
Article number	134438
Journal	Physical Review B
Volume	94
Issue number	13
DOIs	https://doi.org/10.1103/PhysRevB.98.134438
Publication status	Published - 22 Oct 2018

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@article{c61c93922e4e473fa3973ef29d7ef9a8,

title = "Magnetic structure and spin correlations in magnetoelectric honeycomb M n4 T a2 O9",

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 described 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.",

author = "N. Narayanan and A. Senyshyn and D. Mikhailova and T. Faske and T. Lu and Z. Liu and B. Weise and H. Ehrenberg and Mole, {R. A.} and Hutchison, {W. D.} and H. Fuess and McIntyre, {G. J.} and Y. Liu and D. Yu",

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year = "2018",

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day = "22",

doi = "10.1103/PhysRevB.98.134438",

language = "English",

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T1 - Magnetic structure and spin correlations in magnetoelectric honeycomb M n4 T a2 O9

AU - Narayanan, N.

AU - Senyshyn, A.

AU - Mikhailova, D.

AU - Faske, T.

AU - Lu, T.

AU - Liu, Z.

AU - Weise, B.

AU - Ehrenberg, H.

AU - Mole, R. A.

AU - Hutchison, W. D.

AU - Fuess, H.

AU - McIntyre, G. J.

AU - Liu, Y.

AU - Yu, D.

PY - 2018/10/22

Y1 - 2018/10/22

N2 - 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 described 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.

AB - 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 described 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.

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DO - 10.1103/PhysRevB.98.134438

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VL - 94

JO - Physical Review B

JF - Physical Review B

IS - 13

M1 - 134438

ER -

Magnetic structure and spin correlations in magnetoelectric honeycomb M n4 T a2 O9

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