Abstract
We investigate the doping dependence of the magnetic excitations in the two-superconducting-dome system LaFeAsO1−xDx. Using inelastic neutron scattering, spin fluctuations at different wave numbers were observed under both superconducting domes around x =0.1 and 0.4 but vanished at x =0.2 corresponding to the Tc valley. Theoretical calculations indicate that the characteristic doping dependence of the spin fluctuations is rationally explained as a consequence of the switching of the two intra-orbital nestings within Fe-3dYZ, ZX and Fe-3dX2−Y2 by electron doping. The present results imply that the multiorbital nature plays an important role in the doping and/or material dependence of the Tc of the iron pnictide superconductors.
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