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

Journal Article · 18 March 2019 · Physical Review B

DOI: https://doi.org/10.1103/PhysRevB.99.094423 · OSTI ID:1506797

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

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.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

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

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1506797

Alternate ID(s):: OSTI ID: 1501699

Journal Information:: Physical Review B, Vol. 99, Issue 9; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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