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

• Datum: 2014
• Hauptverfasser: Meloche, E., Cottam, M.G., Lockwood, D.J.
• Format: Artikel
• Sprache: English
• Veröffentlicht: Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України 2014
• Schriftenreihe: Физика низких температур
• Schlagworte: К восьмидесятилетию антиферромагнетизма ІІ. Эксперимент
• Online Zugang: https://nasplib.isofts.kiev.ua/handle/123456789/119410
• Назва журналу: Digital Library of Periodicals of National Academy of Sciences of Ukraine
• Zitieren: One-magnon and exciton inelastic light scattering in the antiferromagnet CoF₂ / E. Meloche, M.G. Cottam, D.J. Lockwood // Физика низких температур. — 2014. — Т. 40, № 2. — С. 173-186. — Бібліогр.: 21 назв. — англ.

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.