Phonon Density of States of LaFeAsO1-xFx
A.D. Christianson, M.D. Lumsden, O. Delaire, M.B. Stone, D.L., Abernathy, M.A. McGuire, A.S. Sefat, R. Jin, B.C. Sales, D. Mandrus, E.D., Mun, P.C. Canfield, J.Y.Y. Lin, M. Lucas, M. Kresch, J. B. Keith, B. Fultz,, E.A. Goremychkin, and R.J. McQueeney
TL;DR
This study investigates the phonon density of states in LaFeAsO1-xFx using inelastic neutron scattering, revealing similarities across doping levels and challenging the role of electron-phonon interactions in superconductivity.
Contribution
It provides experimental PDOS data for LaFeAsO1-xFx and compares it with theoretical calculations, highlighting discrepancies relevant to superconductivity mechanisms.
Findings
PDOS similar in parent and doped samples
Good agreement with first-principle calculations except for Fe modes
PDOS inconsistent with conventional electron-phonon superconductivity
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-principle 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.
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Taxonomy
TopicsIron-based superconductors research · Rare-earth and actinide compounds · Inorganic Fluorides and Related Compounds