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23 April 2024

» arxiv » 0810.4941

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C-axis Phonons in Fe-As Based Superconductors Investigated by Inelastic X-ray Scattering
D. Reznik ; K. Lokshin ; D. C. Mitchell ; D. Parshall ; W. Dmowski ; D. Lamago ; R. Heid ; K.-P. Bohnen ; A. S. Sefat ; M. A. McGuire ; B. C. Sales ; D. G. Mandrus ; A. Asubedi ; D. J. Singh ; A. Alatas ; M. H. Upton ; A. H. Said ; Yu. Shvyd'ko ; T. Egami ;
Date:	27 Oct 2008
Abstract:	In Fe-As based superconductors magnetism and superconductivity show strong sensitivity to the lattice, suggesting a possibility of unconventional electron-phonon coupling. We investigated c-axis polarized phonons in doped and undoped BaFe2As2 by inelastic X-ray scattering. Phonon peak positions and linewidths did not vary significantly as a function of doping either by Co or by K. The linewidth of the Fe vibration shows unusual wavevector-dependence, which may be due to hybridization with in-plane modes. Comparison with the density functional theory shows significant difference for the energy of the As-As vibrations (Raman active at the zone center) but not for the Fe-As vibrations (infrared-active at the zone center). This behavior cannot be explained by a 10% softening of Fe-As interaction strength as proposed previously for in-plane polarized vibrations.
Source:	arXiv, 0810.4941
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