Kumar, Pradeep ; Saha, Surajit ; Muthu, D. V. S. ; Sahu, J. R. ; Sood, A. K. ; Rao, C. N. R. (2010) Raman evidence for orbiton-mediated multiphonon scattering in multiferroic TbMnO3 Journal of Physics: Condensed Matter, 22 (11). 115403_1-115403_5. ISSN 0953-8984
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Official URL: http://iopscience.iop.org/0953-8984/22/11/115403
Related URL: http://dx.doi.org/10.1088/0953-8984/22/11/115403
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 (~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 TN (~46 K), suggesting a strong spin-phonon coupling.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to Institute of Physics. |
| ID Code: | 44706 |
| Deposited On: | 23 Jun 2011 06:00 |
| Last Modified: | 03 Oct 2011 14:39 |
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