Phonon Density of States of LaFeAsO_(1-x)F_x

Creators: Christianson, A. D.; Lumsden, M. D.; Delaire, O.; Stone, M. B.; Abernathy, D. L.; McGuire, M. A.; Sefat, A. S.; Jin, R.; Sales, B. C.; Mandrus, D.; Mun, E. D.; Canfield, P. C.; Lin, J. Y. Y.; Lucas, M.; Kresch, M.; Keith, J. B.; Fultz, B.; Goremychkin, E. A.; McQueeney, R. J.

Abstract

We have studied the phonon density of states (PDOS) in LaFeAsO1-xFx with inelastic neutron scattering methods. The PDOS of the parent compound (x=0) is very similar to the PDOS of samples optimally doped with fluorine to achieve the maximum Tc (x~0.1). Good agreement is found between the experimental PDOS and first-principles calculations with the exception of a small difference in Fe mode frequencies. The PDOS reported here is not consistent with conventional electron-phonon mediated superconductivity.

Additional Information

© 2008 The American Physical Society. (Received 22 July 2008; published 8 October 2008) We thank D.J. Singh and M.H. Du for providing their calculations. The portions of this work conducted at Oak Ridge National Laboratory were supported by the Scientific User Facilities Division and by the Division of Materials Sciences and Engineering, Office of Basic Energy Sciences, DOE. Work at the Ames Laboratory was supported by the US Department of Energy Basic Energy Sciences under Contract No. DE-AC02-07CH11358. This work was supported by the U.S. Department of Energy Office of Science, under Contract No. DE-AC02-06CH11357. This work benefited from DANSE software developed under NSF Grant No. DMR-0520547.

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