Phonon anomaly in BaFe2As2
Abstract
The detailed optical properties of BaFe2As2 have been determined over a wide frequency range above and below the structural and magnetic transition at TN = 138 K. A prominent in-plane infrared-active mode is observed at 253 cm-1 (31.4 meV) at 295 K. The frequency of this vibration shifts discontinuously at TN; for T < TN 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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