Abstract
The polarized Raman spectra of stoichiometric ${\mathrm{LaTiO}}_{3}$ ${(T}_{N}=150\mathrm{K})$ were measured between 6 and 300 K. In contrast to earlier report on half-metallic ${\mathrm{LaTiO}}_{3.02},$ neither strong background scattering nor Fano shape of the Raman lines was observed. The high-frequency phonon line at $655{\mathrm{cm}}^{\ensuremath{-}1}$ exhibits anomalous softening below ${T}_{N}:$ a signature for structural rearrangement. The assignment of the Raman lines was done by comparison to the calculations of lattice dynamics and the nature of structural changes upon magnetic ordering is discussed. The broad Raman band, which appears in the antiferromagnetic phase, is assigned to two-magnon scattering. The estimated superexchange constant $J=15.4\ifmmode\pm\else\textpm\fi{}0.4\mathrm{meV}$ is in excellent agreement with the result of neutron-scattering studies.
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