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Title: Raman evidence for orbiton-mediated multiphonon scattering in multiferroic TbMnO3
Authors: Kumar, Pradeep
Saha, Surajit
Muthu, D V S
Sahu, J R
Sood, A K
Rao, C N R
Keywords: Optical Phonons
Raman Spectrascopy
Issue Date: 24-Mar-2010
Publisher: IOP Publishing Ltd
Citation: Journal of Physics-Condensed Matter 22(11), 1-5 (2010)
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.
Description: Restricted access.
Other Identifiers: 0953-8984
Appears in Collections:Research Papers (Prof. C.N.R. Rao)

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