Low-energy spin excitations on polycrystalline LaFeAsO1-xF x samples have been studied by inelastic neutron scattering. The Q-integrated dynamical spin susceptibility χ″(ω) at 11 meV decreases with increasing fluorine content x across the phase transition from antiferromagnetic to superconducting phases. For superconducting samples, a peak in χ″(ω) develops at ω=Eres below T c, accompanied by its reduction below Eres. Fe 3d orbital contribution on the dynamical spin susceptibility and the electron scattering between Γ and M Fermi surfaces are discussed.
|期刊||Journal of Physics: Conference Series|
|出版狀態||Published - 2012|
|事件||5th European Conference on Neutron Scattering, ECNS 2011 - Prague, Czech Republic|
持續時間: 2011 7月 17 → 2011 7月 21
All Science Journal Classification (ASJC) codes
- 物理與天文學 (全部)