Raman evidence for orbiton-mediated multiphonon scattering in multiferroic TbMnO3

Kumar, Pradeep and Saha, Surajit and Muthu, DVS and Sahu, JR and Sood, AK and Rao, CNR (2010) Raman evidence for orbiton-mediated multiphonon scattering in multiferroic TbMnO3. In: Journal of Physics: Condensed Matter, 22 (11).

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Abstract

Temperature-dependent Raman spectra of TbMnO3 from 5 to 300 K in the spectral range of 200-1525 cm(-1) show five first-order Raman allowed modes and two high frequency modes. The intensity ratio of the high frequency Raman band to the corresponding first-order Raman mode is nearly constant and high (similar to 0.6) at all temperatures, suggesting an orbiton-phonon mixed nature of the high frequency mode. One of the first-order phonon modes shows anomalous softening below T-N (similar to 46 K), suggesting a strong spin-phonon coupling.

Item Type:	Journal Article
Publication:	Journal of Physics: Condensed Matter
Publisher:	Institute of Physics.
Additional Information:	Copyright of this article belongs to Institute of Physics.
Department/Centre:	Division of Physical & Mathematical Sciences > Physics
Date Deposited:	23 Mar 2010 10:37
Last Modified:	19 Sep 2010 05:57
URI:	http://eprints.iisc.ac.in/id/eprint/26394

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