Cubic anharmonicity of the Fe-As bond of the iron-pnictides estimated from Raman spectroscopy (original) (raw)

2009

Abstract

We study the phonon spectrum of the iron-pnictide superconductors, (Ce,Nd)O1-xFxFeAs, using Raman spectroscopy. Based on the temperature dependent softening of the out of plane optical Fe-mode (B1g at gamma) we estimate the magnitude of the cubic anharmonicity of the Fe-As bond by calculating the self-energy due to phonon-phonon interactions. This also gives an estimate of the lattice expansion or contraction

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