The optical phonon spectrum of SmFeAsO

Details The optical phonon spectrum of SmFeAsO The optical phonon spectrum of SmFeAsO

2008-10-13

arxiv.org/abs/0810.2176v1

Physics

Condensed Matter

Superconductivity

text file (.tex) and 2 figures (.eps)

Scientific paper

10.1209/0295-5075/84/67013

We measured the Raman and the Infrared phonon spectrum of SmFeAsO polycrystalline samples. We also performed Density Functional Theory calculations within the pseudopotential approximation to obtain the structural and dynamical lattice properties of both the SmFeAsO and the prototype LaFeAsO compounds. The measured Raman and Infrared phonon frequencies are well predicted by the optical phonon frequencies computed at the Gamma point, showing the capability of the employed ab-initio methods to describe the dynamical properties of these materials. A comparison among the phonon frequencies of different oxypnictides suggests a possible role of the high frequency phonons in the pairing mechanism leading to superconductivity in these materials.

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