Physics – Condensed Matter – Materials Science
Scientific paper
2009-05-19
Pramana: Journal of Physics, vol. 74, No. 2, pp. 281 (2010)
Physics
Condensed Matter
Materials Science
16 pages, 6 figures, 1 table
Scientific paper
We have measured near normal incidence far infrared (FIR) reflectivity spectra of a single crystal of TbMnO3 from 10K to 300K in the spectral range of 50 cm$^{-1}$ to 700 cm$^{-1}$. Fifteen transverse optic (TO) and longitudinal optic (LO) modes are identified in the imaginary part of the dielectric function $\epsilon_2$($\omega$) and energy loss function Im(-1/$\epsilon$($\omega$)), respectively. Some of the observed phonon modes show anomalous softening below the magnetic transition temperature T$_N$ (~ 46K). We attribute this anomalous softening to the spin-phonon coupling caused by phonon modulation of the super-exchange integral between the Mn$^{3+}$ spins. The effective charge of oxygen (Z$_O$) calculated using the measured LO-TO splitting increases below T$_N$.
Kumar Pradeep P.
Rao C. N. R.
Saha Surajit
Serrao Claudy Rayan
Sood Ajay K.
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