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. https://resolver.caltech.edu/CaltechAUTHORS:CHRIprl08

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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.

Item Type:

Article

Related URLs:

URL	URL Type	Description
http://dx.doi.org/10.1103/PhysRevLett.101.157004	DOI	Article
http://link.aps.org/abstract/PRL/v101/e157004	Publisher	Article

ORCID:

Author	ORCID
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.

Funders:

Funding Agency	Grant Number
Department of Energy (DOE)	DE-AC02-07CH11358
Department of Energy (DOE)	DE-AC02-06CH11357
NSF	DMR-0520547

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DOI:

10.1103/PhysRevLett.101.157004

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CaltechAUTHORS:CHRIprl08

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https://resolver.caltech.edu/CaltechAUTHORS:CHRIprl08

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11938

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CaltechAUTHORS

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Deposited On:

11 Oct 2008 06:33

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08 Nov 2021 22:23

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