Abstract
The detailed optical properties of ${\text{BaFe}}_{2}{\text{As}}_{2}$ have been determined over a wide frequency range above and below the structural and magnetic transition at ${T}_{N}\ensuremath{\simeq}138\text{ }\text{K}$. A prominent in-plane infrared-active mode is observed at $253\text{ }{\text{cm}}^{\ensuremath{-}1}$ (31.4 meV) at 295 K. The frequency of this vibration shifts discontinuously at ${T}_{N}$; for $T<{T}_{N}$ the frequency of this mode displays almost no temperature dependence, yet it nearly doubles in intensity. This anomalous behavior appears to be a consequence of orbital ordering in the Fe-As layers.
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