Temperature-dependent light scattering from magnetic excitons in TlCoF3 |
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Authors: | JF Ryan JF Scott J Nouet |
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Institution: | Department of Physics and Astrophysics, University of Colorado, Boulder, Colorado 80302, U.S.A.;Service de Physique, Universite du Mans, Le Mans, France |
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Abstract: | Raman spectra of antiferromagnetic thallium cobaltous fluoride have been obtained with 4579A argon ion laser excitation at temperatures from 4°K to TN = 94 ± 2°K. The features observed consist of six Co2+ excitons ranging in energy from 325 to 1070 cm-1, at two-magnon peak with low-temperature energy of 315 cm-1, and a one-magnon feature whose 4°K energy is 37 cm-1. The energy and linewidth of the one-magnon scattering has been measured from 4°K to about 0.8 TN; it is found that the magnon becomes critically damped at about 0.8 TN, in good agreement with our previous observations on RbCoF3. The Co2+ excitons observed at 325, 380, 410, 730 (weak), 960, and 1070 cm-1 agree in energy quite well with the KCoF3 levels calculated by Buyers, Holden et al. as 340, 400, 467, 767, 967 and 1050 cm-1. |
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