title: Phonon density of states of LaFeAsO(1-x)Fx.
abstract: 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.
authors.affiliation: Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA.
authors.forename: A D
authors.initials: AD
authors.lastname: Christianson
authors.forename: M D
authors.initials: MD
authors.lastname: Lumsden
authors.forename: O
authors.initials: O
authors.lastname: Delaire
authors.forename: M B
authors.initials: MB
authors.lastname: Stone
authors.forename: D L
authors.initials: DL
authors.lastname: Abernathy
authors.forename: M A
authors.initials: MA
authors.lastname: McGuire
authors.forename: A S
authors.initials: AS
authors.lastname: Sefat
authors.forename: R
authors.initials: R
authors.lastname: Jin
authors.forename: B C
authors.initials: BC
authors.lastname: Sales
authors.forename: D
authors.initials: D
authors.lastname: Mandrus
authors.forename: E D
authors.initials: ED
authors.lastname: Mun
authors.forename: P C
authors.initials: PC
authors.lastname: Canfield
authors.forename: J Y Y
authors.initials: JY
authors.lastname: Lin
authors.forename: M
authors.initials: M
authors.lastname: Lucas
authors.forename: M
authors.initials: M
authors.lastname: Kresch
authors.forename: J B
authors.initials: JB
authors.lastname: Keith
authors.forename: B
authors.initials: B
authors.lastname: Fultz
authors.forename: E A
authors.initials: EA
authors.lastname: Goremychkin
authors.forename: R J
authors.initials: RJ
authors.lastname: McQueeney