Spin-phonon coupling effects in antiferromagnetic Cr 2O 3 nanoparticles

C. H. Hung, P. H. Shin, F. Y. Wu, W. H. Li, S. Y. Wu, T. S. Chan, H. S. Sheu

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12 Scopus citations

Abstract

In the present work we use Raman microscopy to investigate the size effect of spin-phonon coupling in antiferromagnetic Cr 2O 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 2O 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.

Original languageEnglish
Pages (from-to)4596-4601
Number of pages6
JournalJournal of Nanoscience and Nanotechnology
Volume10
Issue number7
DOIs
StatePublished - Jul 2010

Keywords

  • Nanocrystalline Materials
  • Raman Spectroscopy
  • Spin-Phonon Coupling

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