Phonon anomaly in BaFe2As2

Details Phonon anomaly in BaFe2As2 Phonon anomaly in BaFe2As2

2009-10-08

arxiv.org/abs/0910.1565v2

Phys. Rev. B 80, 180502(R) (2009)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 3 figures and one table (minor revisions)

Scientific paper

10.1103/PhysRevB.80.180502

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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