Two-dimensional ferromagnetic spin-orbital excitations in honeycomb VI3

H. Lane; E. Pachoud; J. A. Rodriguez-Rivera; M. Songvilay; G. Xu; P. M. Gehring; J. P. Attfield; R. A. Ewings; C. Stock

doi:10.1103/PhysRevB.104.L020411

Two-dimensional ferromagnetic spin-orbital excitations in honeycomb VI3

H. Lane, E. Pachoud, J. A. Rodriguez-Rivera, M. Songvilay, G. Xu, P. M. Gehring, J. P. Attfield, R. A. Ewings, C. Stock

Research output: Contribution to journal › Letter › peer-review

Abstract

VI3 is a ferromagnet with planar honeycomb sheets of bonded V3+ ions held together by van der Waals forces. We apply neutron spectroscopy to measure the two-dimensional (J/Jc≈17) magnetic excitations in the ferromagnetic phase, finding two energetically gapped (Δ≈kBTc≈55K) and dispersive excitations. We apply a multilevel spin-wave formalism to describe the spectra in terms of two coexisting domains hosting differing V3+ orbital ground states built from contrasting distorted octahedral environments. This analysis fits a common nearest-neighbor in-plane exchange coupling (J=−8.6±0.3meV) between V3+ sites. The distorted local crystalline electric field combined with spin-orbit coupling provides the needed magnetic anisotropy for spatially long-ranged two-dimensional ferromagnetism in VI3.

Original language	English
Article number	L020411
Pages (from-to)	1-7
Number of pages	7
Journal	Physical Review B
Volume	104
Issue number	2
DOIs	https://doi.org/10.1103/PhysRevB.104.L020411
Publication status	Published - 20 Jul 2021

Keywords

cond-mat.str-el

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10.1103/PhysRevB.104.L020411

2107.04311v1Accepted author manuscript, 7.37 MB

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title = "Two-dimensional ferromagnetic spin-orbital excitations in honeycomb VI3",

abstract = "VI3 is a ferromagnet with planar honeycomb sheets of bonded V3+ ions held together by van der Waals forces. We apply neutron spectroscopy to measure the two-dimensional (J/Jc≈17) magnetic excitations in the ferromagnetic phase, finding two energetically gapped (Δ≈kBTc≈55K) and dispersive excitations. We apply a multilevel spin-wave formalism to describe the spectra in terms of two coexisting domains hosting differing V3+ orbital ground states built from contrasting distorted octahedral environments. This analysis fits a common nearest-neighbor in-plane exchange coupling (J=−8.6±0.3meV) between V3+ sites. The distorted local crystalline electric field combined with spin-orbit coupling provides the needed magnetic anisotropy for spatially long-ranged two-dimensional ferromagnetism in VI3.",

keywords = "cond-mat.str-el",

author = "H. Lane and E. Pachoud and Rodriguez-Rivera, {J. A.} and M. Songvilay and G. Xu and Gehring, {P. M.} and Attfield, {J. P.} and Ewings, {R. A.} and C. Stock",

note = "(main text - 7 pages, 4 figures; supplementary information - 13 pages, 9 figures, to be published in Phys. Rev. B)",

year = "2021",

month = jul,

day = "20",

doi = "10.1103/PhysRevB.104.L020411",

language = "English",

volume = "104",

pages = "1--7",

journal = "Physical Review B",

issn = "2469-9950",

publisher = "American Physical Society",

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TY - JOUR

T1 - Two-dimensional ferromagnetic spin-orbital excitations in honeycomb VI3

AU - Lane, H.

AU - Pachoud, E.

AU - Rodriguez-Rivera, J. A.

AU - Songvilay, M.

AU - Xu, G.

AU - Gehring, P. M.

AU - Attfield, J. P.

AU - Ewings, R. A.

AU - Stock, C.

N1 - (main text - 7 pages, 4 figures; supplementary information - 13 pages, 9 figures, to be published in Phys. Rev. B)

PY - 2021/7/20

Y1 - 2021/7/20

N2 - VI3 is a ferromagnet with planar honeycomb sheets of bonded V3+ ions held together by van der Waals forces. We apply neutron spectroscopy to measure the two-dimensional (J/Jc≈17) magnetic excitations in the ferromagnetic phase, finding two energetically gapped (Δ≈kBTc≈55K) and dispersive excitations. We apply a multilevel spin-wave formalism to describe the spectra in terms of two coexisting domains hosting differing V3+ orbital ground states built from contrasting distorted octahedral environments. This analysis fits a common nearest-neighbor in-plane exchange coupling (J=−8.6±0.3meV) between V3+ sites. The distorted local crystalline electric field combined with spin-orbit coupling provides the needed magnetic anisotropy for spatially long-ranged two-dimensional ferromagnetism in VI3.

AB - VI3 is a ferromagnet with planar honeycomb sheets of bonded V3+ ions held together by van der Waals forces. We apply neutron spectroscopy to measure the two-dimensional (J/Jc≈17) magnetic excitations in the ferromagnetic phase, finding two energetically gapped (Δ≈kBTc≈55K) and dispersive excitations. We apply a multilevel spin-wave formalism to describe the spectra in terms of two coexisting domains hosting differing V3+ orbital ground states built from contrasting distorted octahedral environments. This analysis fits a common nearest-neighbor in-plane exchange coupling (J=−8.6±0.3meV) between V3+ sites. The distorted local crystalline electric field combined with spin-orbit coupling provides the needed magnetic anisotropy for spatially long-ranged two-dimensional ferromagnetism in VI3.

KW - cond-mat.str-el

U2 - 10.1103/PhysRevB.104.L020411

DO - 10.1103/PhysRevB.104.L020411

M3 - Letter

VL - 104

SP - 1

EP - 7

JO - Physical Review B

JF - Physical Review B

SN - 2469-9950

IS - 2

M1 - L020411

ER -

Two-dimensional ferromagnetic spin-orbital excitations in honeycomb VI3

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Keywords

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