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

Christianson, A. D. and Lumsden, M. D. and Delaire, O. and Stone, M. B. and Abernathy, D. L. and McGuire, M. A. and Sefat, A. S. and Jin, R. and Sales, B. C. and Mandrus, D. and Mun, E. D. and Canfield, P. C. and Lin, J. Y. Y. and Lucas, M. and Kresch, M. and Keith, J. B. and Fultz, B. and Goremychkin, E. A. and McQueeney, R. J. (2008) Phonon Density of States of LaFeAsO_(1-x)F_x. Physical Review Letters, 101 (15). Art. No. 157004. ISSN 0031-9007. doi:10.1103/PhysRevLett.101.157004.

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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.

Item Type:Article
Related URLs:
URLURL TypeDescription
Stone, M. B.0000-0001-7884-9715
Abernathy, D. L.0000-0002-3533-003X
Mandrus, D.0000-0003-3616-7104
Lin, J. Y. Y.0000-0001-9233-0100
Fultz, B.0000-0002-6364-8782
Alternate Title:Phonon Density of States of LaFeAsO1-xFx
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.
Funding AgencyGrant Number
Department of Energy (DOE)DE-AC02-07CH11358
Department of Energy (DOE)DE-AC02-06CH11357
Issue or Number:15
Record Number:CaltechAUTHORS:CHRIprl08
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ID Code:11938
Deposited By: Archive Administrator
Deposited On:11 Oct 2008 06:33
Last Modified:08 Nov 2021 22:23

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