Electron Spin Dynamics in (DMe-DCNQI)2M (M = Li1-x Cux (x < 0.14), Ag)

The quarter-filled π band systems, (DMe-DCNQI)2M(M=Li1−xCux(x ≤ 0.14), Ag) were systematically studied with electron paramagnetic resonance (EPR). The intercolumn spin hopping rate D⊥ in Li1−xCux-salt was obtained from the EPR linewidth. The temperature dependence of D⊥ can be understood with the hole soliton model which also explains the DC conductivity. The π − d mixing of the Cu-salt enhances both D⊥ and σ⊥ by103 times more than the Li-salt, which is consistent with the fact that the only Cu-salt has three-dimensional Fermi surface, but that Ag-salt is one-dimensional in spite of the mixing enhancement of D⊥ by 10 times more than the Li-salt.