Journal
JOURNAL OF PHYSICS-CONDENSED MATTER
Volume 20, Issue 42, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0953-8984/20/42/425219
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Funding
- National Science and Engineering Research Council of Canada
- Fonds Quebecois de la Recherche sur la Nature et les Technologies
- Bulgarian Science Fund [TK-X-1712/2007]
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ErMnO3 single crystals are studied by polarized first-order and second-order micro-Raman measurements as a function of temperature and compared to previous hexagonal RMnO3 ( R = Y, Ho, Yb) studies. In addition to the resonance effects of the 684 cm(-1) mode that are correlated with Mn3+ d-d electronic transitions, some phonon frequencies show anomalous temperature variations suggesting a spin-phonon coupling below T-N. The deviation from standard temperature dependence is discussed within a model accounting for the modulation of the exchange interaction by phonon vibrations.
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