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APS » Journals » Phys. Rev. Lett. » Volume 101 » Issue 15
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Phys. Rev. Lett. 101, 157004 (2008) [4 pages]

Phonon Density of States of LaFeAsO1-xFx

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A. D. Christianson1, M. D. Lumsden1, O. Delaire2, M. B. Stone1, D. L. Abernathy1, M. A. McGuire1, A. S. Sefat1, R. Jin1, B. C. Sales1, D. Mandrus1, E. D. Mun3, P. C. Canfield3, J. Y. Y. Lin2, M. Lucas2, M. Kresch2, J. B. Keith2, B. Fultz2, E. A. Goremychkin4,5, and R. J. McQueeney3
1Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
2California Institute of Technology, W. M. Keck Laboratory, Pasadena, California 91125, USA
3Ames Laboratory and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA
4Argonne National Laboratory, Argonne, Illinois 60439, USA
5ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot OX11 0QX, United Kingdom

Received 22 July 2008; published 8 October 2008

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.

© 2008 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.101.157004
DOI:
10.1103/PhysRevLett.101.157004
PACS:
74.70.−b, 63.20.kd, 74.72.−h, 78.70.Nx
 
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