Phonon density of states of LaFeAsO(1-x)Fx

We have studied the phonon density of states (PDOS) in LaFeAsO(1-x)Fx 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 approximately 0.1). Good agreement is found between...

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Veröffentlicht in:	Physical review letters 2008-10, Vol.101 (15), p.157004-157004
Hauptverfasser:	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
Format:	Artikel
Sprache:	eng
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Zusammenfassung:	We have studied the phonon density of states (PDOS) in LaFeAsO(1-x)Fx 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 approximately 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.
ISSN:	0031-9007