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 LaFeAsO1-xFx. Physical Review Letters, 101 (15). Art. No. 157004. ISSN 0031-9007 http://resolver.caltech.edu/CaltechAUTHORS:CHRIprl08
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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.
|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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|Deposited On:||11 Oct 2008 06:33|
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