Magnetic excitations in the quasi-two-dimensional ferromagnet Fe3-xGeTe2 measured with inelastic neutron scattering

Calder, S.; Kolesnikov, A. I.; May, A. F.

doi:10.1103/PhysRevB.99.094423

Title: Magnetic excitations in the quasi-two-dimensional ferromagnet ${Fe}_{3 - x} {GeTe}_{2}$ measured with inelastic neutron scattering

Abstract

Fe_3-xGeTe₂ is an itinerant ferromagnet made up of of two-dimensional layers weakly connected by van der Waals bonding that shows a variety of intriguing phenomena. Inelastic neutron scattering measurements on bulk single crystals of Fe_2.75GeTe₂ were performed to quantify the magnetic exchange interaction energies and anisotropy. The observed inelastic excitations, which extend to a maximum energy of ~75 meV, are indicative of dominant in-plane correlations with negligible magnetic interactions between the layers. A spin gap of 3.7 meV is observed, allowing a measure of the magnetic anisotropy. The excitations are damped, reflective of both the magnetic site occupancy reduction of 25% on one Fe sublattice and the itinerant interactions. A minimal model is employed to describe the excitation spectra and extract magnetic exchange interaction values. The temperature evolution of the excitations are probed and correlations shown to persist above T_c, further indicating the low-dimensional nature of the magnetism.

Authors:

^[1];

^[1]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Publication Date:: 2019-03-18

Research Org.:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Org.:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

OSTI Identifier:: 1506797

Alternate Identifier(s):: OSTI ID: 1501699

Grant/Contract Number:: AC05-00OR22725

Resource Type:: Accepted Manuscript

Journal Name:: Physical Review B

Additional Journal Information:: Journal Volume: 99; Journal Issue: 9; Journal ID: ISSN 2469-9950

Publisher:: American Physical Society (APS)

Country of Publication:: United States

Language:: English

Subject:: 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS

Citation Formats


                    Calder, S., Kolesnikov, A. I., and May, A. F. Magnetic excitations in the quasi-two-dimensional ferromagnet Fe3-xGeTe2 measured with inelastic neutron scattering.  United States: N. p., 2019. 
Web.  doi:10.1103/PhysRevB.99.094423.

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                    Calder, S., Kolesnikov, A. I., & May, A. F. Magnetic excitations in the quasi-two-dimensional ferromagnet Fe3-xGeTe2 measured with inelastic neutron scattering.  United States.  https://doi.org/10.1103/PhysRevB.99.094423

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                    Calder, S., Kolesnikov, A. I., and May, A. F. Mon .  
"Magnetic excitations in the quasi-two-dimensional ferromagnet Fe3-xGeTe2 measured with inelastic neutron scattering".  United States.  https://doi.org/10.1103/PhysRevB.99.094423.  https://www.osti.gov/servlets/purl/1506797.

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@article{osti_1506797,

  title        = {Magnetic excitations in the quasi-two-dimensional ferromagnet Fe3-xGeTe2 measured with inelastic neutron scattering},

  author       = {Calder, S. and Kolesnikov, A. I. and May, A. F.},

  abstractNote = {Fe3-xGeTe2 is an itinerant ferromagnet made up of of two-dimensional layers weakly connected by van der Waals bonding that shows a variety of intriguing phenomena. Inelastic neutron scattering measurements on bulk single crystals of Fe2.75GeTe2 were performed to quantify the magnetic exchange interaction energies and anisotropy. The observed inelastic excitations, which extend to a maximum energy of ~75 meV, are indicative of dominant in-plane correlations with negligible magnetic interactions between the layers. A spin gap of 3.7 meV is observed, allowing a measure of the magnetic anisotropy. The excitations are damped, reflective of both the magnetic site occupancy reduction of 25% on one Fe sublattice and the itinerant interactions. A minimal model is employed to describe the excitation spectra and extract magnetic exchange interaction values. The temperature evolution of the excitations are probed and correlations shown to persist above Tc, further indicating the low-dimensional nature of the magnetism.},

  doi          = {10.1103/PhysRevB.99.094423},

  journal      = {Physical Review B},

  number       = 9,

  volume       = 99,

  place        = {United States},

  year         = {2019},

  month        = {3}

}

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Title: Magnetic excitations in the quasi-two-dimensional ferromagnet Fe 3 - x GeTe 2 measured with inelastic neutron scattering

Abstract

Citation Formats

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Spin waves and magnetic exchange interactions in insulating Rb0.89Fe1.58Se2
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Large anomalous Hall current induced by topological nodal lines in a ferromagnetic van der Waals semimetal
journal, July 2018

Crystal and Magnetic Structures in Layered, Transition Metal Dihalides and Trihalides
journal, April 2017

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Design and operation of the wide angular-range chopper spectrometer ARCS at the Spallation Neutron Source
journal, January 2012

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journal, July 1998

Strong anisotropy and magnetostriction in the two-dimensional Stoner ferromagnet ${Fe}_{3} {GeTe}_{2}$
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Competing antiferromagnetism in a quasi-2D itinerant ferromagnet: Fe ₃ GeTe ₂
journal, November 2016

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journal, August 2015

Anomalous Hall effect in the van der Waals bonded ferromagnet ${Fe}_{3 - x} {GeTe}_{2}$
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journal, March 2015

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journal, January 2018

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Magnetic microstructure and magnetic properties of uniaxial itinerant ferromagnet Fe3GeTe2
journal, August 2016

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journal, June 2010

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Horace : Software for the analysis of data from single crystal spectroscopy experiments at time-of-flight neutron instruments
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journal, January 2018

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