Magnetic correlations and structure in bixbyite across the spin-glass transition

Nikolaj Roth; Feng Ye; Andrew F. May; Bryan C. Chakoumakos; Bo Brummerstedt Iversen

doi:10.1103/PhysRevB.100.144404

Magnetic correlations and structure in bixbyite across the spin-glass transition

Nikolaj Roth, Feng Ye, Andrew F. May, Bryan C. Chakoumakos, Bo Brummerstedt Iversen

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

15 Scopus citations

Abstract

Magnetic frustration in atomically ordered crystals gives rise to a broad range of quantum phenomena. The mineral bixbyite, Fe2-xMnxO3, has magnetic frustration induced by atomic disorder. The end-members Mn2O3 and β-Fe2O3 both have magnetically ordered ground states, but the bixbyite crystal studied here, with a composition Fe1.12Mn0.88O3, instead undergoes a spin-glass-like transition near 32 K. In this study, the magnetic correlations and atomic structure of bixbyite are followed across the spin-glass transition using powder and single-crystal neutron scattering. Refinement of Bragg intensities from neutron diffraction data allows precise determination of the average Fe and Mn concentration on the different crystallographic sites of the structure. No structural transitions occur in bixbyite upon cooling. Using the three-dimensional magnetic difference pair distribution function (3D-mΔPDF), the magnetic correlations are resolved spatially and their temperature dependence determined. The results demonstrate that the spin-spin correlations are strong well above the glass transition temperature, consistent with the spin-glass nature of the magnetism in bixbyite.

Original language	English
Article number	144404
Journal	Physical Review B
Volume	100
Issue number	14
DOIs	https://doi.org/10.1103/PhysRevB.100.144404
State	Published - Oct 2 2019

Funding

Kasper Tolborg is thanked for fruitful discussions. A portion of this research used resources at the Spallation Neutron Source, a DOE Office of Science User Facility operated by the Oak Ridge National Laboratory. Physical property characterization (AFM) was supported by the US Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division. The work was supported by the Danish National Research Foundation (DNRF93).

Funders	Funder number
US Department of Energy
Office of Science
Basic Energy Sciences
Division of Materials Sciences and Engineering
Danmarks Grundforskningsfond	DNRF93

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10.1103/PhysRevB.100.144404

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title = "Magnetic correlations and structure in bixbyite across the spin-glass transition",

abstract = "Magnetic frustration in atomically ordered crystals gives rise to a broad range of quantum phenomena. The mineral bixbyite, Fe2-xMnxO3, has magnetic frustration induced by atomic disorder. The end-members Mn2O3 and β-Fe2O3 both have magnetically ordered ground states, but the bixbyite crystal studied here, with a composition Fe1.12Mn0.88O3, instead undergoes a spin-glass-like transition near 32 K. In this study, the magnetic correlations and atomic structure of bixbyite are followed across the spin-glass transition using powder and single-crystal neutron scattering. Refinement of Bragg intensities from neutron diffraction data allows precise determination of the average Fe and Mn concentration on the different crystallographic sites of the structure. No structural transitions occur in bixbyite upon cooling. Using the three-dimensional magnetic difference pair distribution function (3D-mΔPDF), the magnetic correlations are resolved spatially and their temperature dependence determined. The results demonstrate that the spin-spin correlations are strong well above the glass transition temperature, consistent with the spin-glass nature of the magnetism in bixbyite.",

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AU - Ye, Feng

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AU - Iversen, Bo Brummerstedt

PY - 2019/10/2

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N2 - Magnetic frustration in atomically ordered crystals gives rise to a broad range of quantum phenomena. The mineral bixbyite, Fe2-xMnxO3, has magnetic frustration induced by atomic disorder. The end-members Mn2O3 and β-Fe2O3 both have magnetically ordered ground states, but the bixbyite crystal studied here, with a composition Fe1.12Mn0.88O3, instead undergoes a spin-glass-like transition near 32 K. In this study, the magnetic correlations and atomic structure of bixbyite are followed across the spin-glass transition using powder and single-crystal neutron scattering. Refinement of Bragg intensities from neutron diffraction data allows precise determination of the average Fe and Mn concentration on the different crystallographic sites of the structure. No structural transitions occur in bixbyite upon cooling. Using the three-dimensional magnetic difference pair distribution function (3D-mΔPDF), the magnetic correlations are resolved spatially and their temperature dependence determined. The results demonstrate that the spin-spin correlations are strong well above the glass transition temperature, consistent with the spin-glass nature of the magnetism in bixbyite.

AB - Magnetic frustration in atomically ordered crystals gives rise to a broad range of quantum phenomena. The mineral bixbyite, Fe2-xMnxO3, has magnetic frustration induced by atomic disorder. The end-members Mn2O3 and β-Fe2O3 both have magnetically ordered ground states, but the bixbyite crystal studied here, with a composition Fe1.12Mn0.88O3, instead undergoes a spin-glass-like transition near 32 K. In this study, the magnetic correlations and atomic structure of bixbyite are followed across the spin-glass transition using powder and single-crystal neutron scattering. Refinement of Bragg intensities from neutron diffraction data allows precise determination of the average Fe and Mn concentration on the different crystallographic sites of the structure. No structural transitions occur in bixbyite upon cooling. Using the three-dimensional magnetic difference pair distribution function (3D-mΔPDF), the magnetic correlations are resolved spatially and their temperature dependence determined. The results demonstrate that the spin-spin correlations are strong well above the glass transition temperature, consistent with the spin-glass nature of the magnetism in bixbyite.

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Magnetic correlations and structure in bixbyite across the spin-glass transition

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