Phys. Rev. Lett. 102, 217001 (2009) [4 pages]Measurement of Anomalous Phonon Dispersion of CaFe2As2 Single Crystals Using Inelastic Neutron ScatteringReceived 18 February 2009; published 26 May 2009 We measured phonon dispersions of CaFe2As2 using inelastic neutron scattering and compared our results to predictions of density functional theory in the local density approximation. The calculation gives correct frequencies of most phonons if the experimental crystal structure is used, except observed linewidths/frequencies of certain modes were larger/softer than predicted. Strong temperature dependence of some phonons near the structural phase transition near 172 K may indicate strong electron-phonon coupling and/or anharmonicity, which may be important for superconductivity. © 2009 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.102.217001
DOI:
10.1103/PhysRevLett.102.217001
PACS:
74.25.Kc, 63.20.−e, 71.38.−k, 78.70.Nx
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