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Phonon anomaly in BaFe2As2

Strongly Correlated Electrons 2009-11-20 v2 Superconductivity
Authors: A. Akrap , J. J. Tu , L. J. Li , G. H. Cao , X. A. Xu , C. C. Homes
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Abstract

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.

Keywords

phonon modes and lattice dynamics phonon physics phase transitions

Cite

@article{arxiv.0910.1565,
  title  = {Phonon anomaly in BaFe2As2},
  author = {A. Akrap and J. J. Tu and L. J. Li and G. H. Cao and X. A. Xu and C. C. Homes},
  journal= {arXiv preprint arXiv:0910.1565},
  year   = {2009}
}

Comments

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

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