Raman evidence for Orbiton-Mediated Multiphonon Scattering in Multiferroic TbMnO$_3$

Details Raman evidence for Orbiton-Mediated Multiphonon Scattering in Multiferroic TbMnO$_3$ Raman evidence for Orbiton-Mediated Multiphonon Scattering in Multiferroic TbMnO$_3$

2010-04-09

arxiv.org/abs/1004.1616v1

J. Phys.: Condens. Matter vol. 22, pp. 115403 (2010)

Physics

Condensed Matter

Strongly Correlated Electrons

14 pages, 3 figures, 1 table

Scientific paper

10.1088/0953-8984/22/11/115403

Temperature-dependent Raman spectra of TbMnO$_3$ from 5 K to 300 K in the spectral range of 200 to 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 ($\sim$ 0.6) at all temperatures, suggesting a orbiton-phonon mixed nature of the high frequency mode. One of the first order phonon modes shows anomalous softening below T$_N$ ($\sim$ 46 K), suggesting a strong spin-phonon coupling.

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