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arxiv: 0910.1565 · v2 · submitted 2009-10-08 · ❄️ cond-mat.str-el · cond-mat.supr-con

Phonon anomaly in BaFe2As2

A. Akrap , J. J. Tu , L. J. Li , G. H. Cao , X. A. Xu , C. C. Homes This is my paper
classification ❄️ cond-mat.str-el cond-mat.supr-con
keywords frequencybafe2as2modeabovealmostanomalousanomalyappears
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The detailed optical properties of BaFe2As2 have been determined over a wide frequency range above and below the structural and magnetic transition at T_N = 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 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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