Spin-Phonon Coupling Effects in Antiferromagnetic Cr(2)O(3) Nanoparticles

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Title:	Spin-Phonon Coupling Effects in Antiferromagnetic Cr(2)O(3) Nanoparticles
Authors:	Hung,CH;Shih,PH;Wu,FY;Li,WH;Wu,SY;Chan,TS;Sheu,HS
Contributors:	物理學系
Keywords:	RAMAN-SPECTRA;NANOCRYSTALS;CRO2;SCATTERING
Date:	2010
Issue Date:	2012-06-11 10:46:59 (UTC+8)
Publisher:	國立中央大學
Abstract:	In the present work we use Raman microscopy to investigate the size effect of spin-phonon coupling in antiferromagnetic Cr(2)O(3) 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 Cr(2)O(3). 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.
Relation:	JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
Appears in Collections:	[物理學系] 期刊論文

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