Charge transport in the insulating state of (DMe-DCNQI)2Li above TSP:: A possible fractional charge soliton conduction with ±1/2/e -: art. no. 056604

A spin-Peierls system (DMe-DCNQI)(2)Li is studied with W-band electron paramagnetic resonance (EPR) (approximate to94 GHz) to unveil a charge transport mechanism in the insulating 4k(F) charge density wave state above T-SP. The electron hopping between the neighbor DCNQI columns provides an additional broadening of the EPR linewidth, since the neighbor columns are generally nonequivalent to each other with respect to g shift. The obtained intercolumn hopping rates lead us to the conclusion that the electron hopping to a hole soliton carrying a fractional charge of e/2 in the neighbor column dominates the intercolumn charge transport.