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

Автор(и)

  • E. Meloche Department of Physics and Astronomy, University of Western Ontario, London, Ontario N6A 3K7, Canada
  • M.G. Cottam Department of Physics and Astronomy, University of Western Ontario, London, Ontario N6A 3K7, Canada
  • D.J. Lockwood Institute for Microstructural Sciences, National Research Council, Ottawa, Ontario K1A 0R6, Canada

DOI:

https://doi.org/10.1063/1.4865560%20

Ключові слова:

antiferromagnet, inelastic light scattering, magnetic excitations.

Анотація

Experimental data are reported for the temperature and polarization dependence of the one-magnon Raman light scattering in the rutile-structure antiferromagnet CoF2 (Néel 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.

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Опубліковано

2013-12-18

Як цитувати

(1)
Meloche, E.; Cottam, M.; Lockwood, D. One-Magnon and Exciton Inelastic Light Scattering in the Antiferromagnet CoF2. Fiz. Nizk. Temp. 2013, 40, 173-186.

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