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

Abstract

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.

Authors:
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
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.
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. doi:10.1103/PhysRevB.99.094423.
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. doi:10.1103/PhysRevB.99.094423. https://www.osti.gov/servlets/purl/1506797.
@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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