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Lattice and electronic anomalies of CaFe2As2 studied by Raman spectroscopy
- Issue Date
- Dec-2008
- Publisher
- AMER PHYSICAL SOC
- Keywords
- calcium compounds; electronic density of states; iron compounds; light scattering; phonons; Raman spectra; solid-state phase transformations; spectral line breadth
- Citation
- PHYSICAL REVIEW B, v.78, no.21
- Journal Title
- PHYSICAL REVIEW B
- Volume
- 78
- Number
- 21
- ISSN
- 1098-0121
- Abstract
- We report inelastic light-scattering experiments on CaFe2As2 in the temperature range of 4-290 K. In in-plane polarizations two Raman-active phonon modes are observed at 189 and 211 cm(-1), displaying A(1g) and B-1g symmetries, respectively. Upon heating through the tetragonal-to-orthorhombic transition at about T-S=173 K, the B-1g phonon undergoes a discontinuous drop of frequency by 4 cm(-1), whereas the A(1g) phonon shows a suppression of the integrated intensity. Their linewidth increases strongly with increasing temperature and saturates above T-S. This suggests (i) a first-order structural phase transition and (ii) a drastic change in charge distribution within the FeAs plane through T-S.
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