Influence of the Verwey transition on the spin-wave dispersion of magnetite

R. J. McQueeney; M. Yethiraj; W. Montfrooij; J. S. Gardner; P. Metcalf; J. M. Honig

doi:10.1063/1.1846555

Influence of the Verwey transition on the spin-wave dispersion of magnetite

R. J. McQueeney
, M. Yethiraj
, W. Montfrooij
, J. S. Gardner
, P. Metcalf
, J. M. Honig

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

5 Scopus citations

Abstract

Inelastic neutron-scattering measurements of the spin-wave spectrum of magnetite (Fe3 O4) that shed new light on the Verwey transition problem are presented. Above the Verwey transition, the spin waves can fit a simple Heisenberg model. Below TV, a large gap (8 meV) forms in the acoustic spin-wave branch at q= (0,0,12) and E=43 meV. Heisenberg models with large unit cells were used to examine the spin waves when the superexchange is modified to reflect the crystallographic symmetry lowering due to either atomic distortions or charge ordering and find that neither of these models predicts the spin-wave gap.

Original language	English
Article number	10A902
Journal	Journal of Applied Physics
Volume	97
Issue number	10
DOIs	https://doi.org/10.1063/1.1846555
State	Published - May 15 2005
Externally published	Yes

Funding

One of the authors (R.J.M.) would like to thank T. Holden, Z. Tun, and C. Carey for their suggestions and help. This work was supported (in part) by Oak Ridge National Laboratory, which is managed by UT-Batelle LLC, under Contract No. DE-AC00OR22725 for the U. S. Department of Energy.

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abstract = "Inelastic neutron-scattering measurements of the spin-wave spectrum of magnetite (Fe3 O4) that shed new light on the Verwey transition problem are presented. Above the Verwey transition, the spin waves can fit a simple Heisenberg model. Below TV, a large gap (8 meV) forms in the acoustic spin-wave branch at q= (0,0,12) and E=43 meV. Heisenberg models with large unit cells were used to examine the spin waves when the superexchange is modified to reflect the crystallographic symmetry lowering due to either atomic distortions or charge ordering and find that neither of these models predicts the spin-wave gap.",

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AU - McQueeney, R. J.

AU - Yethiraj, M.

AU - Montfrooij, W.

AU - Gardner, J. S.

AU - Metcalf, P.

AU - Honig, J. M.

PY - 2005/5/15

Y1 - 2005/5/15

N2 - Inelastic neutron-scattering measurements of the spin-wave spectrum of magnetite (Fe3 O4) that shed new light on the Verwey transition problem are presented. Above the Verwey transition, the spin waves can fit a simple Heisenberg model. Below TV, a large gap (8 meV) forms in the acoustic spin-wave branch at q= (0,0,12) and E=43 meV. Heisenberg models with large unit cells were used to examine the spin waves when the superexchange is modified to reflect the crystallographic symmetry lowering due to either atomic distortions or charge ordering and find that neither of these models predicts the spin-wave gap.

AB - Inelastic neutron-scattering measurements of the spin-wave spectrum of magnetite (Fe3 O4) that shed new light on the Verwey transition problem are presented. Above the Verwey transition, the spin waves can fit a simple Heisenberg model. Below TV, a large gap (8 meV) forms in the acoustic spin-wave branch at q= (0,0,12) and E=43 meV. Heisenberg models with large unit cells were used to examine the spin waves when the superexchange is modified to reflect the crystallographic symmetry lowering due to either atomic distortions or charge ordering and find that neither of these models predicts the spin-wave gap.

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VL - 97

JO - Journal of Applied Physics

JF - Journal of Applied Physics

IS - 10

M1 - 10A902

ER -

Influence of the Verwey transition on the spin-wave dispersion of magnetite

Abstract

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