Spatial Mapping of Mobility and Density of the Conduction Electrons in (FA)₂PF₆

Novel implementation of the Fourier imaging technique on conduction electron spins in the one-dimensional organic conductors (FA)₂PF₆ (FA: fluoranthene) is reported. Two-dimensional spatial imaging of resolution 30μm² is combined with the pulsed-gradient spin-echo technique, to derive maps revealing the local properties of the electron spin density and mobility. The maps generally show pronounced inhomogeneity of both density and mobility on the scale of ∼30–300μm. Highly mobile regions were identified to exist, and the mobility in these was quantitatively evaluated by a basic theoretical model of restricted diffusion.