Journal
PHYSICAL REVIEW B
Volume 78, Issue 21, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.78.212503
Keywords
calcium compounds; electronic density of states; iron compounds; light scattering; phonons; Raman spectra; solid-state phase transformations; spectral line breadth
Ask authors/readers for more resources
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.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available