Spin-phonon coupling effects in antiferromagnetic Cr2O3 nanoparticles.
In the present work we use Raman microscopy to investigate the size effect of spin-phonon coupling in antiferromagnetic Cr2O3 nanoparticles. The peculiarities of the dependency of the phonon wave number on temperature (with a relatively weak peak at 293 cm(-1)) can be attributed to the spin-phonon coupling. The variation with temperature of the spin-phonon mode develops when the antiferromagnetic state is near the ordering temperature of the Cr spins. The observations can be reasonably well interpreted by describing the order parameter. A shift in frequency is caused by a strong spin-phonon interaction in Cr2O3. The obtained s-ph coefficients are found to be consistent with the strain, where raising the strain results in weakening of the s-ph coupling.
Department of Physics, National Dong Hwa University, Hualien 97401, Taiwan.
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CH
Hung
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Shih
F-Y
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Wu
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Li
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Wu
T S
TS
Chan
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Sheu