One-magnon and exciton inelastic light scattering in the antiferromagnet CoF2

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DOIResolve DOI: http://doi.org/10.1063/1.4865560
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TypeArticle
Journal titleLow Temperature Physics
ISSN1063-777X
1090-6517
Volume40
Issue2
Pages134145; # of pages: 12
AbstractExperimental data are reported for the temperature and polarization dependence of the one-magnon Raman light scattering in the rutile-structure antiferromagnet CoF₂ (Neel temperature TN = 38 K). The low-lying excitons are also investigated at low temperatures and comparisons made with results from earlier Raman, infrared, and neutron scattering work. A detailed analysis of the one-magnon Stokes and anti-Stokes Raman spectra is presented resulting in comprehensive data for the temperature variation up to TN of the one-magnon frequency, line width, and integrated intensity. A theory of the one-magnon scattering and other magnetic transitions is constructed based mainly on a spin S = 3/2 exchange model, extending a simpler effective S = 1/2 approach. The excitation energies and spectral intensities over a broad range of temperatures are obtained using a Green's function equation of motion method that allows for a careful treatment of the single-ion anisotropy. Overall the S = 3/2 theory compares well with the experimental data.
Publication date
LanguageEnglish
AffiliationMeasurement Science and Standards; National Research Council Canada
Peer reviewedYes
NPARC number21272098
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Record identifiera62aaf86-c190-48be-b3c3-1138bc542fe6
Record created2014-07-21
Record modified2016-05-09
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